SiUS12-928_B Service Manual G-Series / J-Series [Applied Models] Inverter Multi : Heat Pump
SiUS12-928_B SUPER MULTI NX G-Series / J-Series Service Manual Heat Pump Indoor Unit CTXS07JVJU CTXS09HVJU CTXS12HVJU FTXS15HVJU FTXS18HVJU CTXS07LVJU FTXS09LVJU FTXS12LVJU FTXS15LVJU FTXS18LVJU FDXS09DVJU FDXS12DVJU FDXS09LVJU FDXS12LVJU CDXS15LVJU CDXS18LVJU Outdoor Unit 2MXS18GVJU 3MXS24JVJU 4MXS32GVJU 1. Safety Considerations.............................................................................. vii 1.1 Safety Considerations for Repair ........................................................
SiUS12-928_B 1. Indoor Unit.................................................................................................17 1.1 1.2 1.3 1.4 1.5 CTXS07JVJU, CTXS09/12HVJU, FTXS15/18HVJU.................................. 17 CTXS07LVJU, FTXS09/12LVJU ................................................................ 19 FTXS15/18LVJU ........................................................................................ 22 FDXS09/12DVJU .......................................................................
SiUS12-928_B 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Remote Controller ...................................................................................... 72 AUTO · DRY · COOL · HEAT · FAN Operation ......................................... 74 Adjusting the Airflow Direction.................................................................... 76 INTELLIGENT EYE Operation ................................................................... 78 POWERFUL Operation ................................................
SiUS12-928_B 3. Service Check Function ..........................................................................138 3.1 ARC452 Series Remote Controller .......................................................... 138 3.2 ARC433 Series Remote Controller .......................................................... 141 4. Code Indication on Remote Controller ....................................................144 4.1 Indoor Unit....................................................................................
SiUS12-928_B 7.14 Capacitor Voltage Check.......................................................................... 200 7.15 Power Module Check ............................................................................... 201 Part 7 Removal Procedure ....................................................................... 202 1. Outdoor Unit: 2MXS18GVJU ..................................................................203 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Removal of Outer Panels ......................
Safety Considerations SiUS12-928_B 1. Safety Considerations Read these SAFETY CONSIDERATIONS carefully before performing any repair work. Comply with these safety symbols without fail.Meanings of DANGER, WARNING, CAUTION, and NOTE Symbols: DANGER .............. Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING ............ Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. CAUTION ....
SiUS12-928_B • Do not repair the electrical components with wet hands. Working on the equipment with wet hands may cause an electrical shock. • Do not clean the air conditioner by splashing water on it. Washing the unit with water may cause an electrical shock. • Ground the unit when repairing equipment in a humid or wet place to avoid electrical shocks. • Turn off the power when cleaning the equipment to prevent internal fans that rotate at high speed from starting suddenly as they can cause injury.
SiUS12-928_B Part 1 List of Functions 1. Functions.....................................................................................................
SiUS12-928_B Functions Operation Limit for Cooling (°FDB) Compressor Comfortable Airflow Comfort Control Operation Lifestyle Convenience — — FTXS15/18HVJU Basic Function Inverter (with Inverter Power Control) CTXS07JVJU CTXS09/12HVJU Functions FTXS15/18HVJU Category CTXS07JVJU CTXS09/12HVJU 1.
Basic Function Operation Limit for Cooling (°FDB) — — Compressor Comfortable Airflow Comfort Control Operation Lifestyle Convenience Functions FTXS09/12/15/18LVJU Inverter (with Inverter Power Control) Category CTXS07LVJU FTXS09/12/15/18LVJU SiUS12-928_B CTXS07LVJU Functions Air-Purifying Filter — — Photocatalytic Deodorizing Filter — — — — Category Health & Clean Functions Operation Limit for Heating (°FWB) — — Air-Purifying Filter with Photocatalytic Deodorizing Funct
Category Functions Basic Function Inverter (with Inverter Power Control) Compressor Comfortable Airflow Comfort Control Operation Lifestyle Convenience Category Health & Clean Functions FDXS09/12DVJU Functions FDXS09/12DVJU SiUS12-928_B Air-Purifying Filter — — Photocatalytic Deodorizing Filter — PAM Control — Air-Purifying Filter with Photocatalytic Deodorizing Function — — Operation Limit for Cooling (°FDB) — Operation Limit for Heating (°FWB) Oval Scroll Compressor — Swing
Compressor Comfortable Airflow Comfort Control Operation Lifestyle Convenience Inverter (with Inverter Power Control) Operation Limit for Cooling (°FDB) — — CDXS15/18LVJU Basic Function Functions FDXS09/12LVJU Category CDXS15/18LVJU SiUS12-928_B FDXS09/12LVJU Functions Air-Purifying Filter — — Photocatalytic Deodorizing Filter — — — — — — Category Health & Clean Functions Operation Limit for Heating (°FWB) — — Air-Purifying Filter with Photocatalytic Deodorizing Funct
Operation Limit for Cooling (°CDB) -10 ~ 46 -10 ~ 46 Operation Limit for Cooling (°FDB) 14 ~ 114.8 14 ~ 114.8 Operation Limit for Heating (°CWB) -15 -15 ~ 15.5 ~ 15.5 Basic Function Inverter (with Inverter Power Control) Operation Limit for Heating (°FWB) Compressor Comfortable Airflow Comfort Control 5~ 59.
SiUS12-928_B Part 2 Specifications 1. Indoor Unit...................................................................................................8 2. Outdoor Unit..............................................................................................
SiUS12-928_B Indoor Unit 1.
Indoor Unit SiUS12-928_B 60 Hz, 230 V FTXS15HVJU Model Rated Capacity Front Panel Color Airflow Rate Fan FTXS18HVJU Cooling Heating Cooling 15 kBtu/h Class White H M L Type Motor Output Speed Air Direction Control Air Filter Running Current (Rated) Power Consumption (Rated) Power Factor (Rated) Temperature Control Dimensions (H × W × D) Packaged Dimensions (H × W × D) Weight (Mass) Gross Weight (Gross Mass) Sound Pressure H/M/L Level Heat Insulation Liquid Piping Connection Gas Drain Drawing No.
SiUS12-928_B Indoor Unit 60 Hz, 208 - 230 V FTXS09LVJU Model Heating Rated Capacity Front Panel Color Airflow Rate Fan H M L SL Type Motor Output Speed cfm (m³/min) Heating 12 kBtu/h Class White 381 (10.8) 279 (7.9) 194 (5.5) 145 (4.1) 420 (11.9) 321 (9.1) 233 (6.6) 219 (6.2) 403 (11.4) 307 (8.7) 205 (5.8) 155 (4.4) 438 (12.4) 335 (9.5) 240 (6.8) 212 (6.0) Cross Flow Fan 23 5 Steps, Quiet, Auto Right, Left, Horizontal, Downward Removable / Washable / Mildew Proof 0.09 - 0.08 0.11 - 0.
Indoor Unit SiUS12-928_B CDXS, FDXS Series 60 Hz, 230 V FDXS09DVJU Model Rated Capacity External Static Pressure H Airflow Rate M L Type Fan Motor Output Speed Air Filter Running Current (Rated) Power Consumption (Rated) Power Factor (Rated) Temperature Control Dimensions (H × W × D) Packaged Dimensions (H × W × D) Weight (Mass) Gross Weight (Gross Mass) Sound Pressure H/M/L Level Heat Insulation Liquid Piping Connection Gas Drain Drawing No. Cooling W Steps A W % in. (mm) in.
SiUS12-928_B Indoor Unit 60 Hz, 208 - 230 V CDXS15LVJU Model Rated Capacity External Static Pressure H M Airflow Rate L SL Type Fan Motor Output Speed Air Filter Running Current (Rated) Power Consumption (Rated) Power Factor (Rated) Temperature Control Dimensions (H × W × D) Packaged Dimensions (H × W × D) Weight (Mass) Gross Weight (Gross Mass) Sound Pressure H/M/L Level Heat Insulation Liquid Piping Gas Connections Drain Drawing No. CDXS18LVJU Cooling W Steps A W % in. (mm) in.
Outdoor Unit SiUS12-928_B 2. Outdoor Unit 60 Hz, 208 - 230 V 2MXS18GVJU Model Cooling Heating Casing Color Compressor Refrigerant Oil Refrigerant Airflow Rate Fan Type Model Motor Output Model Charge Type W oz (L) Lbs (kg) Charge H L H L Type Motor Output Running Current Power Consumption Starting Current Dimension (H W D) Packaged Dimension (H W D) Weight (Mass) Gross Weight (Gross Mass) Sound Pressure Level Liquid Piping Gas Connections Drain Heat Insulation No.
SiUS12-928_B Outdoor Unit 60 Hz, 208 - 230 V 3MXS24JVJU Model Cooling Heating Casing Color Compressor Refrigerant Oil Refrigerant Airflow Rate Fan Type Model Motor Output Model Charge Type W oz (L) Lbs (kg) Charge H M L H M L Type Motor Output Running Current Power Consumption Starting Current Dimension (H W D) Packaged Dimension (H W D) Weight (Mass) Gross Weight (Gross Mass) Sound Pressure Level Liquid Piping Gas Connections Drain Heat Insulation No.
Outdoor Unit SiUS12-928_B 60 Hz, 208 - 230 V 4MXS32GVJU Model Cooling Heating Casing Color Compressor Refrigerant Oil Refrigerant Airflow Rate Fan Type Model Motor Output Model Charge Type W oz (L) Lbs (kg) Charge H M L H M L Type Motor Output Running Current Power Consumption Starting Current Dimension (H W D) Packaged Dimension (H W D) Weight (Mass) Gross Weight (Gross Mass) Sound Pressure Level Liquid Piping Gas Connections Drain Heat Insulation No.
SiUS12-928_B Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit.................................................................................................17 1.1 1.2 1.3 1.4 1.5 CTXS07JVJU, CTXS09/12HVJU, FTXS15/18HVJU.................................. 17 CTXS07LVJU, FTXS09/12LVJU ................................................................ 19 FTXS15/18LVJU ........................................................................................ 22 FDXS09/12DVJU .................
Indoor Unit SiUS12-928_B 1. Indoor Unit 1.
SiUS12-928_B PCB Detail Indoor Unit PCB (1): Control PCB H2 H3 FG S1 S32 V1 FU1 H1 S21 S6 S8 S35 LED A JA JB JC S28 PCB (2): Signal Receiver PCB S26 2P099167-1 PCB (3): Buzzer PCB S27 SW1 S38 S29 2P099167-1 RTH1 PCB (4): Display PCB 2P099167-1 PCB (5): INTELLIGENT EYE Sensor PCB LED1 LED2 LED3 S37 2P099167-1 S36 3P099913-1 Printed Circuit Board Connector Wiring Diagram 18
Indoor Unit 1.
SiUS12-928_B PCB Detail Indoor Unit PCB (1): Control PCB V1 H1 FU1 H2 FG H3 LED A S32 S1 S21 JB JA JC S41 S47 S46 S25 2P206687-4 Printed Circuit Board Connector Wiring Diagram 20
Indoor Unit SiUS12-928_B PCB (2): Signal Receiver PCB S48 3P210728-1 PCB (3): Display PCB RTH1 SW1 LED3 LED2 S49 LED1 3P210728-1 PCB (4): INTELLIGENT EYE Sensor PCB S26 3EB86013-1 21 Printed Circuit Board Connector Wiring Diagram
SiUS12-928_B 1.
Indoor Unit PCB Detail SiUS12-928_B PCB (1): Control PCB V1 H1 FU1 (3.
SiUS12-928_B Indoor Unit PCB (2): Signal Receiver PCB S48 3P224121-1 PCB (3): Display PCB RTH1 SW1 LED3 LED2 S49 LED1 3P224121-1 PCB (4): INTELLIGENT EYE Sensor PCB S36 3P227885-1 Printed Circuit Board Connector Wiring Diagram 24
Indoor Unit 1.4 SiUS12-928_B FDXS09/12DVJU Connectors and Other Parts PCB (1): Control PCB 1) 2) 3) 4) 5) 6) 7) 8) S1 S7 S21 S26 S32 H1, H2, H3 GND JA 9) JB JC 10) LED A 11)FU1 (F1U) 12)V1 (V1TR) Connector for fan motor Connector for fan motor (Hall IC) Connector for centralized control (HA) Connector for display PCB Connector for indoor heat exchanger thermistor Connector for terminal board Connector for terminal board (ground) Address setting jumper Refer to page 265 for detail.
SiUS12-928_B PCB Detail Indoor Unit PCB (1): Control PCB FU1 S1 H2 H1 H3 V1 GND S7 S21 JA LED A JB JC S32 S26 2P131149-1 PCB (2): Display PCB S1 LED3 LED2 RTH1 1 LED1 SW1 2P084375-1 Printed Circuit Board Connector Wiring Diagram 26
Indoor Unit 1.
SiUS12-928_B PCB Detail Indoor Unit A1P: Control PCB V1 S1 H2 FG H1 FU1 H3 S7 S21 LED A JA JC JB S32 S26 2P292535-1 A2P: Display PCB S1 LED3 LED2 RTH1 1 SW1 2P084375-1 LED 1 does not function.
Outdoor Unit SiUS12-928_B 2. Outdoor Unit 2.1 2MXS18GVJU Connectors and Other Parts Main PCB 1) S10 2) S15 3) S20 (white) 4) S21 (red) 5) S31, S32 6) S33, S71 7) S40 8) S51, S101 9) S80 10)S90 11)S91 12)S92 13)S93 14)AC1, AC2 15)E 16)H1, H2 17)FU2 18)V2, V5 Connector for MID1 (indoor - outdoor transmission) Connector for COOL / HEAT mode lock Refer to page 262 for detail.
SiUS12-928_B Outdoor Unit MID2 (Inverter PCB) 1) 2) 3) 4) S34, S72 S70 FU201 W, V, U, N Connector for main PCB Connector for outdoor fan motor Fuse (3.
Outdoor Unit SiUS12-928_B MID1 HN V3 FU1 HL S11 HE 3P080081-2 MID2 (Inverter PCB) S72 W V U N S34 S70 FU201 (3.
SiUS12-928_B 2.2 Outdoor Unit 3MXS24JVJU, 4MXS32GVJU Connectors and Other Parts PCB (1): Main PCB 1) S10 2) S15 Connector for terminal board (indoor - outdoor transmission) Connector for COOL / HEAT mode lock Refer to page 262 for detail.
Outdoor Unit PCB Detail SiUS12-928_B PCB (1): Main PCB AC1 (brown) FU2 E1 E2 V3 FU1 V100 V2 HR1 (white) V9 HR2 (blue) AC2 (blue) S10 S15 S101 V5 S80 S93 S23 S22 S21 S20 S70 FU3 S40 S92 S90 S51 W V U 2P209947-1 2P209947-2 PCB (2): Service Monitor PCB SW2 LED3 LED1 LED4 LED2 LED A S52 SW5 SW1 SW3 SW4 S102 3P165332-1 33 Printed Circuit Board Connector Wiring Diagram
SiUS12-928_B Part 4 Function and Control 1. Main Functions..........................................................................................35 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 1.13 Temperature Control .................................................................................. 35 Frequency Principle.................................................................................... 35 Airflow Direction Control (CTXS/FTXS Series) ..........................................
Main Functions SiUS12-928_B 1. Main Functions 1.1 Temperature Control Definitions of Temperatures The definitions of temperatures are classified as following.
SiUS12-928_B Inverter Principle Main Functions To regulate the capacity, a frequency control is needed. The inverter makes it possible to alter the rotation speed of the compressor. The following table explains the conversion principle: Phase 1 2 Drawing of Inverter Description The supplied AC power source is converted into the DC power source for the present. The DC power source is reconverted into the three phase AC power source with variable frequency.
Main Functions Frequency Limits SiUS12-928_B The following functions regulate the minimum and maximum frequency: Frequency Low High Forced Operation 1.3 Functions Four-way valve operation compensation. Refer to page 57. Compressor protection function. Refer to page 58. Discharge pipe temperature control. Refer to page 58. Input current control. Refer to page 59. Freeze-up protection control. Refer to page 59. Heating peak-cut control. Refer to page 60. Defrost control. Refer to page 62.
SiUS12-928_B Main Functions FTXS15/18LVJU Vertical Swing (up and down) Cooling / Dry Heating 15˚ 15˚ 30˚ 25˚ 60˚ 50˚ 25˚ 75˚ 70˚ 40˚ 75˚ 70˚ (R9305) (R9304) (R9303) 3-D Airflow Horizontal Swing (right and left) Fan 45˚ 45˚ (R9306) Alternative repetition of vertical and horizontal swing motions enables uniform air-conditioning of the entire room. This function is effective for starting the air conditioner.
Main Functions 1.4 SiUS12-928_B Fan Speed Control for Indoor Unit Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH. The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature. This is done through phase control and Hall IC control. For more information about Hall IC, refer to the troubleshooting for fan motor on page 150, 152.
SiUS12-928_B Main Functions Note: COMFORT AIRFLOW Operation 1. During POWERFUL operation, the fan rotates at H tap + 50 ~ 90 rpm. 2. The fan stops during defrost operation. CTXS/FTXS-L Series The fan speed is controlled automatically within the following steps. L tap ~ MH tap (same as AUTOMATIC) ML tap ~ MH tap The latest command has the priority between POWERFUL and COMFORT AIRFLOW. 1.
Main Functions 1.6 Outline Detail SiUS12-928_B Automatic Operation Automatic Cooling / Heating Function When the automatic operation is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.
SiUS12-928_B 1.7 Main Functions Thermostat Control Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Thermostat OFF Condition The temperature difference is in the zone A. Thermostat ON Condition The temperature difference returns to the zone C after being in the zone A. The system resumes from defrost control in any zones except A. The operation turns on in any zones except A.
Main Functions SiUS12-928_B CTXS/FTXS-L series Room thermistor temperature – target temperature OFF A 3.6°F (2.0°C) B 2.7°F (1.5°C) C 0.9°F (0.5°C) ON (R14451) CDXS/FDXS series Room thermistor temperature – target temperature OFF A 1.5°C (2.7°F) B 1.8°F (1.0°C) C 0.5°C (0.9°F) ON (R12402) Refer to “Temperature Control” on page 35 for detail.
SiUS12-928_B 1.8 Main Functions NIGHT SET Mode Outline When the OFF timer is set, the NIGHT SET Mode is automatically activated. The NIGHT SET Mode keeps the airflow rate setting. Detail The NIGHT SET Mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers it slightly in the case of heating.
Main Functions 1.9 Outline SiUS12-928_B ECONO Operation CTXS/FTXS-L, CDXS/FDXS-L Series ECONO operation reduces the maximum operating current and the power consumption. This operation is particularly convenient for energy-saving-oriented users. It is also a major bonus for those whose breaker capacities do not allow the use of multiple electrical devices and air conditioners. It is easily activated from the wireless remote controller by pushing the [ECONO] button.
SiUS12-928_B Main Functions 1.10 HOME LEAVE Operation Outline FDXS-D Series HOME LEAVE operation is a function that allows you to record your favorite set temperature and airflow rate. You can start your favorite operation mode simply by pressing the [HOME LEAVE] button on the remote controller. Detail 1. Start of Function The function starts when the [HOME LEAVE] button is pressed in cooling mode, heating mode (including POWERFUL operation), or while the operation is stopped.
Main Functions SiUS12-928_B 1.11 INTELLIGENT EYE Operation (CTXS/FTXS Series) Outline This function detects the existence of humans in the room with a motion sensor (INTELLIGENT EYE) and reduces the capacity when there is nobody in the room in order to save electricity. Detail 1. Detection method by INTELLIGENT EYE sampling (20 msec.) Sensor output If the sensor detects the outputs 10 times/sec. or more, it judges humans exist. 1 sec.
SiUS12-928_B Main Functions 1.12 Inverter POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, operate the air conditioner by increasing the indoor fan rotating speed and the compressor frequency. Detail When [POWERFUL] button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.
Main Functions SiUS12-928_B 1.13 Other Functions 1.13.1 Hot-Start Function In order to prevent the cold air blast that normally comes when heating operation is started, the temperature of the indoor heat exchanger is detected, and the airflow is either stopped or made very weak thereby carrying out comfortable heating of the room. *The cold air blast is also prevented using similar control when the defrosting operation is started or when the thermostat is turned ON. 1.13.
SiUS12-928_B Main Functions 1.13.6 Auto-restart Function If a power failure (including one for just a moment) occurs during the operation, the operation restarts automatically when the power is restored in the same condition as before the power failure. Note: It takes 3 minutes to restart the operation because the 3-minute standby function is activated. 1.13.7 WEEKLY TIMER Operation CTXS/FTXS-L Series Up to 4 timer settings can be saved for each day of the week (up to 28 settings in total).
Function of Thermistor SiUS12-928_B 2.
SiUS12-928_B Function of Thermistor (1) Outdoor Heat Exchanger Thermistor 1. The outdoor heat exchanger thermistor is used for controlling the target discharge pipe temperature. The system sets the target discharge pipe temperature according to the outdoor and indoor heat exchanger temperature, and controls the outdoor electronic expansion valve opening so that the target discharge pipe temperature can be obtained. 2.
Function of Thermistor (5) Liquid Pipe Thermistor 53 SiUS12-928_B 1. When only one indoor unit is in heating, the liquid pipe thermistor is used for subcooling control. The actual subcool is calculated with the liquid pipe temperature and the maximum indoor heat exchanger temperature. The system controls the outdoor electronic expansion valve openings to obtain the target subcool. 2. In heating operation, the liquid pipe thermistor is used for liquid pipes isothermal control.
SiUS12-928_B Control Specification 3. Control Specification 3.1 Mode Hierarchy Outline Air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing.
Control Specification 3.2 Outline SiUS12-928_B Frequency Control Frequency that corresponds to each room’s capacity is determined according to the difference between the target temperature and the temperature of each room. The function is explained as follows. 1. How to determine frequency 2. Frequency command from an indoor unit (Difference between a room thermistor temperature and the target temperature) 3. Frequency command from an indoor unit (The ranked capacity of the operating room) 4.
SiUS12-928_B Control Specification Indoor Frequency Command (D signal) The difference between a room thermistor temperature and the target temperature is taken as the “D signal” and is used for frequency command. Temperature D difference signal –3.6°F (–2.0°C) Th OFF –2.7°F (–1.5°C) 1 –1.8°F (–1.0°C) 2 –0.9°F (–0.5°C) 3 Temperature difference 0°F (0°C) D signal 4 Temperature difference 3.6°F (2.0°C) D signal 8 Temperature difference 7.2°F (4.0°C) D signal C 0.9°F (0.5°C) 1.8°F (1.0°C) 2.
Control Specification 3.3 SiUS12-928_B Controls at Mode Changing / Start-up 3.3.1 Preheating Operation Outline The inverter operation in open phase starts with the conditions of the outdoor temperature and the preheating command from the indoor unit. Detail ON Condition When the outdoor temperature is below 50.9°F (10.5°C), the inverter operation in open phase starts. OFF Condition When the outdoor temperature is higher than 53.6°F (12°C), the inverter operation in open phase stops. 3.3.
SiUS12-928_B Control Specification 3.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency is set as follows. (The function is not used when defrosting.) (Hz) Frequency C B A D E (sec.) Time F (R13528) 3.4 A (Hz) 55 B (Hz) 65 C (Hz) 80 D (seconds) 120 E (seconds) 200 F (seconds) 470 Discharge Pipe Temperature Control Outline The discharge pipe temperature is used as the internal temperature of the compressor.
Control Specification 3.5 Outline SiUS12-928_B Input Current Control An input current is detected by the CT while the compressor is running, and the frequency upper limit is set from the input current. In case of heat pump models, this control which is the upper limit control of the frequency takes priority over the lower limit control of four way valve operation compensation.
SiUS12-928_B 3.7 Control Specification Heating Peak-cut Control Outline During heating operation, the indoor heat exchanger temperature determines the frequency upper limit to prevent abnormal high pressure. Detail The operating frequency is judged with the indoor heat exchanger temperature 2 minutes after the operation starts and F seconds after the number of operation room is changed. The maximum value of the indoor heat exchanger temperature controls the following (excluding stopped rooms).
Control Specification 3.8 SiUS12-928_B Outdoor Fan Control 1. Fan ON control to cool down the electrical box The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF. 2. Fan OFF control during defrosting The outdoor fan is turned OFF while defrosting. 3. Fan OFF delay when stopped The outdoor fan is turned OFF 60 seconds after the compressor stops. 4.
SiUS12-928_B Control Specification 3.10 Defrost Control Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish. Detail Conditions for Starting Defrost The starting conditions are determined with the outdoor temperature and the outdoor heat exchanger temperature. The system is in heating operation. The compressor operates for 6 minutes.
Control Specification SiUS12-928_B 3.11 Low Hz High Pressure Limit Outline The system controls the upper limit of the frequency to prevent abnormal high pressure while the frequency is low. Control is carried out according to three zones. Detail A Dropping zone Reset zone Highest indoor heat exchanger temperature among operating rooms Note: Keep zone B C (R14587) 18 class 24/32 class A 140°F (60°C) 134.6°F (57°C) B 138.2°F (59°C) 132.8°F (56°C) C 132.8°F (56°C) 127.
SiUS12-928_B Control Specification Detail Gas pipe isothermal control SC (subcooling) control Control when the frequency changes Control for abnormally high discharge pipe temperature Oil recovery control Indoor freeze-up protection control Liquid pipe temperature control Liquid pipe temperature control for non-operating units Dew prevention control for indoor rotor The followings are the examples of outdoor electronic expansion valve control which function in each operation mode.
Control Specification SiUS12-928_B 3.12.1 Fully Closing with Power on The outdoor electronic expansion valve is initialized when the power is turned on. The opening position is set and the pressure equalization is developed. 3.12.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The outdoor electronic expansion valve opens, and develops the pressure equalization. 3.12.
SiUS12-928_B Control Specification 3.12.8 Control for Disconnection of the Discharge Pipe Thermistor Outline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the condensing temperature. If the discharge pipe thermistor is disconnected, the outdoor electronic expansion valve opens according to the outdoor temperature and the operation frequency, operates for a specified time, and then stops.
Control Specification SiUS12-928_B 3.12.11Target Discharge Pipe Temperature Control The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger temperature, and the outdoor electronic expansion valve opening is adjusted so that the actual discharge pipe temperature becomes close to the target discharge pipe temperature. (Indirect SH (superheating) control using the discharge pipe temperature) The target discharge pipe temperature is set as to become the aiming SH.
SiUS12-928_B Control Specification 3.13 Malfunctions 3.13.1 Sensor Malfunction Detection Sensor malfunction may occur either in the thermistor or current transformer (CT) system. Relating to Thermistor Malfunction 1. Outdoor heat exchanger thermistor 2. Discharge pipe thermistor 3. Radiation fin thermistor 4. Gas pipe thermistor for each room 5. Outdoor temperature thermistor 6. Liquid pipe thermistor Relating to CT Malfunction Refer to “CT or related abnormality” on page 179 for detail. 3.13.
Control Specification SiUS12-928_B 3.13.4 Anti-icing Function If the indoor heat exchanger’s temperature drops below the specified temperature during cooling, the outdoor electonic expansion valve will open and the fully-closed operation is carried out in the room. After this, if an abnormal freezing occurs for longer than a specified time, the system will shut down.
SiUS12-928_B Part 5 Operation Manual 1. System Configuration................................................................................71 2. CTXS-J, CTXS-H, FTXS-H Series ............................................................72 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Remote Controller ...................................................................................... 72 AUTO · DRY · COOL · HEAT · FAN Operation ......................................... 74 Adjusting the Airflow Direction..........
System Configuration SiUS12-928_B 1. System Configuration After installation and trial operation of the room air conditioner are completed, the air conditioner should be handled and operated as described in the following pages. Every user should be informed on the correct method of operation and how to check if it can cool (or heat) well, and how to use it efficiently. Providing instructions to the user can reduce requests for servicing by 80%.
SiUS12-928_B CTXS-J, CTXS-H, FTXS-H Series 2. CTXS-J, CTXS-H, FTXS-H Series 2.1 Remote Controller Name of Parts Remote Controller: ARC452A9 Signal transmitter Receiver • To use the remote controller, aim the transmitter at the indoor unit. If there is anything to block signals between the unit and the remote controller, such as a curtain, the unit will not operate. • Do not drop the remote controller. Do not get it wet. • The maximum distance for communication is approximately 23ft. (7m).
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B Open the front cover MODE selector button HOME LEAVE button • Selects the operation mode. (AUTO/DRY/COOL/HEAT/ FAN) Page 10 • HOME LEAVE operation. Page 18 SWING button • Adjusting the airflow direction. Page 12 QUIET button • OUTDOOR UNIT QUIET operation. Page 17 SENSOR button • INTELLIGENT EYE operation. Page 14,15 OFF TIMER button ON TIMER button Page 20 Page 21 TIMER CANCEL button CLOCK button • Cancels the timer setting.
SiUS12-928_B 2.2 CTXS-J, CTXS-H, FTXS-H Series AUTO · DRY · COOL · HEAT · FAN Operation AUTO · DRY · COOL · HEAT · FAN Operation The air conditioner operates with the operation mode of your choice. From the next time on, the air conditioner will operate with the same operation mode. To start operation 1. Press and select a operation mode. • Each pressing of the button advances the mode setting in sequence. AUTO 2. Press •“ COOL DRY HEAT FAN . ” is displayed on the LCD.
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B To change the airflow rate setting Press . DRY operation The airflow rate setting is not variable. AUTO or COOL or HEAT or FAN operation 5 levels of airflow rate setting from “ ” to “ ” plus “ ” and “ ” are available. • Indoor unit quiet operation When the airflow is set to “ ”, the noise from the indoor unit will become quieter. Use this when making the noise quieter. The unit might lose capacity when the airflow rate is set to a weak level.
SiUS12-928_B 2.3 CTXS-J, CTXS-H, FTXS-H Series Adjusting the Airflow Direction Adjusting the Airflow Direction You can adjust the airflow direction to increase your comfort. Adjusting the upper and lower airflow direction To adjust the louvers (horizontal blades) 1. Press •“ . ” is displayed on the LCD and the louvers will begin to swing. 2. When the louvers have reached the desired position, press once more. • The louvers will stop moving. • “ ” is no longer displayed on the LCD.
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B To start 3-D airflow 1. 3. Press the and the : the “ ” and “ ” display will light up and the louvers and fins will move in turn. To cancel 3-D airflow 2. 4. Press either the or the . NOTE Note on the angles of the louvers • When COOL and DRY operation is selected, the louvers swinging range depends on the operation. (See the figure.
SiUS12-928_B 2.4 CTXS-J, CTXS-H, FTXS-H Series INTELLIGENT EYE Operation INTELLIGENT EYE Operation “INTELLIGENT EYE” is the infrared sensor which detects the human movement. To start INTELLIGENT EYE operation 1. Press •“ . ” is displayed on the LCD. To cancel INTELLIGENT EYE operation 2. Press •“ again. ” is no longer displayed on the LCD. [Example] When somebody in the room • Normal operation The air conditioner is in normal operation while the sensor is detecting the movement of people.
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B “INTELLIGENT EYE” is useful for energy saving Energy saving operation • Change the temperature –3.6°F (–2°C) in HEAT / +3.6°F (+2°C) in COOL / +1.8°F (+1°C) in DRY operation from set temperature. • Decrease the airflow rate slightly in FAN operation only. • If no presence detected in the room for 20 minutes. NOTE Notes on INTELLIGENT EYE operation • Application range is as follows. . 3ft ) (7m 90° 2 Horizontal angle 110° (Top view) 55° 55° 23ft.
SiUS12-928_B 2.5 CTXS-J, CTXS-H, FTXS-H Series POWERFUL Operation POWERFUL Operation POWERFUL operation quickly maximizes the cooling (heating) effect in any operation mode. You can get the maximum capacity. To start POWERFUL operation Press during operation. • POWERFUL operation ends in 20 minutes. Then the system automatically operates again with the previous settings which were used before POWERFUL operation. •“ ” is displayed on the LCD.
CTXS-J, CTXS-H, FTXS-H Series 2.6 SiUS12-928_B OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET operation lowers the sound level of the outdoor unit by changing the frequency and fan speed on the outdoor unit. This function is convenient during night. To start OUTDOOR UNIT QUIET operation Press •“ . ” is displayed on the LCD. To cancel OUTDOOR UNIT QUIET operation Press •“ again. ” is no longer displayed on the LCD.
SiUS12-928_B 2.7 CTXS-J, CTXS-H, FTXS-H Series HOME LEAVE Operation HOME LEAVE Operation HOME LEAVE operation is a function which allows you to record your preferred temperature and airflow rate settings. To start HOME LEAVE operation 1. Press •“ . ” is displayed on the LCD. • The HOME LEAVE lamp lights up. Display To cancel HOME LEAVE operation 2. Press •“ again. ” is no longer displayed on the LCD. • The HOME LEAVE lamp goes off. Before using HOME LEAVE operation.
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B What’s the HOME LEAVE operation? Is there a set temperature and airflow rate which is most comfortable, a set temperature and airflow rate which you use the most? HOME LEAVE operation is a function that allows you to record your favorite set temperature and airflow rate. You can start your favorite operation mode simply by pressing on the remote controller. This function is convenient in the following situations. Useful in these cases 1.
SiUS12-928_B 2.8 CTXS-J, CTXS-H, FTXS-H Series TIMER Operation TIMER Operation Timer functions are useful for automatically switching the air conditioner on or off at night or in the morning. You can also use OFF TIMER and ON TIMER in combination. To use OFF TIMER operation • Check that the clock is correct. If not, set the clock to the present time. 1. Press . “ ” is displayed. “ ” blinks. 2. Press until the time setting reaches the point you like.
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. 1. Press . “ ” is displayed. “ ” blinks. 2. Press until the time setting reaches the point you like. • Each pressing of either button increases or decreases the time setting by 10 minutes. Holding down either button changes the setting rapidly. 3. Press again. • The TIMER lamp lights up. Display To cancel ON TIMER operation Press .
SiUS12-928_B 2.9 CTXS-J, CTXS-H, FTXS-H Series Note for Multi System Note for Multi System What is a multi system? This system has one outdoor unit connected to multiple indoor units. Selecting the operation mode 1. With the priority room setting present but inactive or not present. Outdoor unit B room A When more than one indoor unit is operating, priority is room given to the first unit that was turned on.
CTXS-J, CTXS-H, FTXS-H Series SiUS12-928_B OUTDOOR UNIT QUIET operation Page 17 1. With the priority room setting present but inactive or not present. When using the OUTDOOR UNIT QUIET operation feature with the multi system, set all indoor units to OUTDOOR UNIT QUIET operation using their remote controllers. When clearing OUTDOOR UNIT QUIET operation, clear one of the operating indoor units using its remote controller.
SiUS12-928_B CTXS-L, FTXS-L Series 3. CTXS-L, FTXS-L Series 3.1 Remote Controller Names of Parts Remote Controller Signal transmitter Display (LCD) • Displays the current settings. (In this illustration, each section is shown with all its displays on for the purpose of explanation.) Receiver • To use the remote controller, aim the transmitter at the indoor unit. If there is anything to block signals between the unit and the remote controller, such as a curtain, the unit will not operate.
CTXS-L, FTXS-L Series SiUS12-928_B Open the front cover MODE selector button ECONO button • Selects the operation mode. (AUTO/DRY/COOL/HEAT/ FAN) Page 11 • ECONO operation. Page 19 SWING button • Adjusting the airflow direction. Page 13 QUIET button • OUTDOOR UNIT QUIET operation. Page 18 COMFORT/SENSOR button • COMFORT AIRFLOW and INTELLIGENT EYE operation. Page 15,16 OFF TIMER button Page 20 : WEEKLY button : PROGRAM button : COPY button TIMER CANCEL button • Cancels the timer setting.
SiUS12-928_B 3.2 CTXS-L, FTXS-L Series AUTO · DRY · COOL · HEAT · FAN Operation AUTO · DRY · COOL · HEAT · FAN Operation The air conditioner operates with the operation mode of your choice. From the next time on, the air conditioner will operate with the same operation mode. To start operation 1. Press and select an operation mode. • Each pressing of the button advances the mode setting in sequence. AUTO 2. Press DRY COOL HEAT FAN . •“ ” is displayed on the LCD.
CTXS-L, FTXS-L Series SiUS12-928_B To change the temperature setting Press or . • The displayed items on the LCD will change whenever either one of the buttons is pressed. COOL operation 64-90˚F (18-32˚C) HEAT operation 50-86˚F (10-30˚C) AUTO operation 64-86˚F (18-30˚C) Press to raise the temperature and press temperature. to lower the DRY or FAN operation The temperature setting is not variable.
SiUS12-928_B 3.3 CTXS-L, FTXS-L Series Adjusting the Airflow Direction and Rate Adjusting the Airflow Direction and Rate You can adjust the airflow direction to increase your comfort. To start auto swing Upper and lower airflow direction Press . • “ ” is displayed on the LCD. • The louvers (horizontal blades) will begin to swing. Right and left airflow direction Press . •“ ” is displayed on the LCD. • The fins (vertical blades) will begin to swing. The 3-D airflow direction Press and .
CTXS-L, FTXS-L Series SiUS12-928_B CTXS07LVJU, FTXS09/12LVJU To adjust the airflow rate setting Press . • Each pressing of Auto advances the airflow rate setting in sequence. Indoor unit quiet High Middle high Low Middle low Middle • When the airflow is set to “ ”, indoor unit quiet operation will start and the noise from the unit will become quieter. • In indoor unit quiet operation, the airflow rate is set to a weak level. • In DRY operation, the airflow rate setting is not variable.
SiUS12-928_B CTXS-L, FTXS-L Series FTXS15/18LVJU To adjust the airflow rate setting Press . • Each pressing of Auto advances the airflow rate setting in sequence. Indoor unit quiet High Middle high Low Middle low Middle • When the airflow is set to “ ”, indoor unit quiet operation will start and the noise from the unit will become quieter. • In indoor unit quiet operation, the airflow rate is set to a weak level. • In DRY operation, the airflow rate setting is not variable.
CTXS-L, FTXS-L Series 3.4 SiUS12-928_B COMFORT AIRFLOW / INTELLIGENT EYE Operation COMFORT AIRFLOW / INTELLIGENT EYE Operation COMFORT AIRFLOW operation The flow of air will be in the upward direction while in COOL operation and in the downward direction while in HEAT operation, providing comfortable cool or warm air that does not come in direct contact with people. COOL operation HEAT operation INTELLIGENT EYE operation “INTELLIGENT EYE” is the infrared sensor which detects the human movement.
SiUS12-928_B CTXS-L, FTXS-L Series To start operation Press and select the desired mode. • Each time the is pressed a different setting option is displayed on the LCD. • The INTELLIGENT EYE lamp lights green. Display • By selecting “ ” from the following icons, the air conditioner will be in COMFORT AIRFLOW operation combined with INTELLIGENT EYE operation.
CTXS-L, FTXS-L Series 3.5 SiUS12-928_B POWERFUL Operation POWERFUL Operation POWERFUL operation quickly maximizes the cooling (heating) effect in any operation mode. You can get the maximum capacity. To start POWERFUL operation Press during operation. • POWERFUL operation ends in 20 minutes. Then the system automatically operates again with the previous settings which were used before POWERFUL operation. •“ ” is displayed on the LCD. To cancel POWERFUL operation Press •“ again.
SiUS12-928_B 3.6 CTXS-L, FTXS-L Series OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET operation lowers the noise level of the outdoor unit by changing the frequency and fan speed on the outdoor unit. This function is convenient during the night. To start OUTDOOR UNIT QUIET operation Press •“ . ” is displayed on the LCD. To cancel OUTDOOR UNIT QUIET operation Press •“ again. ” is no longer displayed on the LCD.
CTXS-L, FTXS-L Series 3.7 SiUS12-928_B ECONO Operation ECONO Operation ECONO operation is a function which enables efficient operation by limiting the maximum power consumption value. This function is useful for cases in which attention should be paid to ensure a circuit breaker will not trip when the product runs alongside other appliances. To start ECONO operation Press •“ during operation. ” is displayed on the LCD. To cancel ECONO operation Press •“ again.
SiUS12-928_B 3.8 CTXS-L, FTXS-L Series OFF TIMER Operation OFF TIMER Operation Timer functions are useful for automatically switching the air conditioner on or off at night or in the morning. You can also use OFF TIMER and ON TIMER in combination. To use OFF TIMER operation • Check that the clock is correct. If not, set the clock to the present time. 1. Press . “ “ •“ ” is displayed on the LCD. ” blinks. ” is no longer displayed on the LCD. 2.
CTXS-L, FTXS-L Series 3.9 SiUS12-928_B ON TIMER Operation ON TIMER Operation To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. 1. Press . “ ” is displayed on the LCD. “ •“ ” blinks. ” and day of the week are no longer displayed on the LCD. 2. Press until the time setting reaches the point you like. • Each pressing of either button increases or decreases the time setting by 10 minutes.
SiUS12-928_B CTXS-L, FTXS-L Series 3.10 WEEKLY TIMER Operation WEEKLY TIMER Operation Up to 4 timer settings can be saved for each day of the week. It is convenient if the WEEKLY TIMER is set according to the family’s life style. Using in these cases of WEEKLY TIMER Example: The same timer settings are made for the week from Monday through Friday while different timer settings are made for the weekend. [Monday] Make timer settings up to programs 1-4.
CTXS-L, FTXS-L Series SiUS12-928_B WEEKLY TIMER Operation To use WEEKLY TIMER operation Setting mode • Make sure the day of the week and time are set. If not, set the day of the week and time. Program 1 Program 2 ON OFF ON 8:30 17:30 [Monday] 77˚F (25˚C) 6:00 Program 4 Program 3 OFF 81˚F (27˚C) 22:00 Setting Displays Day and number settings 1. Press Time settings ON/OFF settings Temperature settings .
SiUS12-928_B CTXS-L, FTXS-L Series 6. Press to select the desired time. • The time can be set between 0:00 and 23:50 in 10 minute intervals. • To return to the ON/OFF TIMER mode setting, press . • Go to STEP 9 when setting the OFF TIMER. 7. Press . • The time will be set. •“ ” and the temperature blink. 8. Press to select the desired temperature. • The temperature can be set between 50˚F (10˚C) and 90˚F (32˚C). Cooling: The unit operates at 64˚F (18˚C) even if it is set at 50 (10) to 63˚F (17˚C).
CTXS-L, FTXS-L Series SiUS12-928_B WEEKLY TIMER Operation Copy mode • A reservation made once can be copied to another day of the week. The whole reservation of the selected day of the week will be copied. Program 1 Program 2 ON OFF [Monday] COPY Program 3 77˚F (25˚C) 8:30 Program 1 Program 2 ON OFF ON 17:30 8:30 17:30 22:00 Program 3 77˚F (25˚C) 6:00 OFF 81˚F (27˚C) 6:00 [Tuesday] to [Friday] Program 4 ON Program 4 OFF 81˚F (27˚C) 22:00 Setting Displays Confirmation display 1.
SiUS12-928_B CTXS-L, FTXS-L Series Confirming a reservation • The reservation can be confirmed. Setting Displays Normal display Confirmation display 1. Press . • The day of the week and the reservation number of current day will be displayed. 2. Press to select the day of the week and the reservation number to be confirmed. • Pressing displays the reservation details. • To change the confirmed reserved settings, select the reservation number and press . The mode is switched to setting mode.
CTXS-L, FTXS-L Series SiUS12-928_B WEEKLY TIMER Operation To delete reservations The individual reservation 1. Press . • The day of the week and the reservation number will be displayed. 2. Press to select the day of the week and the reservation number to be deleted. 3. Press •“ . ” and “ 4. Press • Pressing ” or “ ” blink. and select “ blank ”. changes ON/OFF TIMER mode. • The reservation has no setting when selecting “blank”. ON TIMER 5. Press OFF TIMER blank .
SiUS12-928_B CTXS-L, FTXS-L Series 3.11 Note for Multi System Note for Multi System Multi system has one outdoor unit connected to multiple indoor units. Selecting the operation mode With the priority room setting present but inactive or not present. When more than one indoor unit is operating, priority is given to the first unit that was turned on. In this case, set the units that are turned on later to the same operation mode as the first unit.
CTXS-L, FTXS-L Series SiUS12-928_B Note for Multi System COOL / HEAT mode lock The COOL / HEAT mode lock requires initial programming during installation. Please consult your authorized dealer for assistance. The COOL / HEAT mode lock sets the unit forcibly to either COOL or HEAT operation. This function is convenient when you wish to set all indoor units connected to the multi system to the same operation mode.
SiUS12-928_B CTXS-L, FTXS-L Series 3.
FDXS-D Series SiUS12-928_B 4. FDXS-D Series 4.1 Remote Controller Remote Controller 1 2 5 3 6 4 7 9 8 10 13 15 14 12 11 〈 ARC433B63 〉 1. Signal transmitter: • It sends signals to the indoor unit. 2. Display: • It displays the current settings. (In this illustration, each section is shown with all its displays ON for the purpose of explanation.) 3. HOME LEAVE button: HOME LEAVE operation (page 14.) 4. POWERFUL button: POWERFUL operation (page 12.) 5.
SiUS12-928_B 4.2 FDXS-D Series AUTO · DRY · COOL · HEAT · FAN Operation AUTO · DRY · COOL · HEAT · FAN Operation The air conditioner operates with the operation mode of your choice. From the next time on, the air conditioner will operate with the same operation mode. To start operation 1. Press “MODE selector button” and select a operation mode. • Each pressing of the button advances the mode setting in sequence. : AUTO : DRY : COOL : HEAT : FAN 4 2, 3 1 5 2. Press “ON/OFF button”.
FDXS-D Series SiUS12-928_B To change the air flow rate setting 5. Press “FAN setting button”. DRY mode The air flow rate setting is not variable. AUTO or COOL or HEAT or FAN mode Five levels of air flow rate setting from “ ” to “ “ ” “ ” are available. ” plus • Indoor unit quiet operation When the air flow is set to “ ”, the noise from the indoor unit will become quieter. Use this when making the indoor unit quieter. The unit might lose capacity when the fan strength is set to a weak level.
SiUS12-928_B 4.3 FDXS-D Series POWERFUL Operation POWERFUL Operation POWERFUL operation quickly maximizes the cooling (heating) effect in any operation mode. You can get the maximum capacity. To start POWERFUL operation 1. Press “POWERFUL button”. • POWERFUL operation ends in 20 minutes. Then the system automatically operates again with the settings which were used before POWERFUL operation. • When using POWERFUL operation, there are some functions which are not available.
FDXS-D Series 4.4 SiUS12-928_B OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET operation lowers the sound level of the outdoor unit by changing the frequency and fan speed on the outdoor unit. This function is convenient during night. To start OUTDOOR UNIT QUIET operation 1. Press “QUIET button”. •“ ” is displayed on the LCD. To cancel OUTDOOR UNIT QUIET operation 2. Press “QUIET button” again. •“ ” disappears from the LCD.
SiUS12-928_B 4.5 FDXS-D Series HOME LEAVE Operation HOME LEAVE Operation HOME LEAVE operation is a function which allows you to record your preferred temperature and air flow rate settings. To start HOME LEAVE operation 1. Press “HOME LEAVE button”. •“ ” is displayed on the LCD. • The HOME LEAVE lamp lights up. 1, 2 To cancel HOME LEAVE operation 2. Press “HOME LEAVE button” again. •“ ” disappears from the LCD. • The HOME LEAVE lamp goes off. Before using HOME LEAVE operation.
FDXS-D Series SiUS12-928_B What’s the HOME LEAVE operation? Is there a set temperature and air flow rate which is most comfortable, a set temperature and air flow rate which you use the most? HOME LEAVE operation is a function that allows you to record your favorite set temperature and air flow rate. You can start your favorite operation mode simply by pressing the HOME LEAVE button on the remote controller. This function is convenient in the following situations. Useful in these cases 1.
SiUS12-928_B 4.6 FDXS-D Series TIMER Operation TIMER Operation Timer functions are useful for automatically switching the air conditioner on or off at night or in the morning. You can also use OFF TIMER and ON TIMER in combination. To use OFF TIMER operation • Check that the clock is correct. If not, set the clock to the present time. 1. Press “OFF TIMER button”. is displayed. blinks. 2. Press “TIMER Setting button” until the time setting reaches the point you like.
FDXS-D Series SiUS12-928_B To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. 1. Press “ON TIMER button”. is displayed. blinks. 2. Press “TIMER Setting button” until the time setting reaches the point you like. • Every pressing of either button increases or decreases the time setting by 10 minutes. Holding down either button changes the setting rapidly. 3. Press “ON TIMER button” again. • The TIMER lamp lights up.
SiUS12-928_B CDXS-L, FDXS-L Series 5. CDXS-L, FDXS-L Series 5.1 Remote Controller Names of Parts Remote Controller Signal transmitter Display (LCD) • Displays the current settings. (In this illustration, each section is shown with all its displays on for the purpose of explanation.) Receiver • To use the remote controller, aim the transmitter at the indoor unit. If there is anything to block signals between the unit and the remote controller, such as a curtain, the unit will not operate.
CDXS-L, FDXS-L Series SiUS12-928_B Open the front cover MODE selector button • Selects the operation mode. (AUTO/DRY/COOL/HEAT/ FAN) Page 11 QUIET button ECONO button • OUTDOOR UNIT QUIET operation. Page 15 OFF TIMER button • ECONO operation. Page 16 ON TIMER button Page 18 Page 17 TIMER CANCEL button CLOCK button • Cancels the timer setting. Page 17,18 SELECT button • Changes the ON/OFF TIMER settings.
SiUS12-928_B 5.2 CDXS-L, FDXS-L Series AUTO · DRY · COOL · HEAT · FAN Operation AUTO · DRY · COOL · HEAT · FAN Operation The air conditioner operates with the operation mode of your choice. From the next time on, the air conditioner will operate with the same operation mode. To start operation 1. Press and select an operation mode. • Each pressing of the button advances the mode setting in sequence. AUTO 2. Press DRY COOL HEAT FAN . •“ ” is displayed on the LCD.
CDXS-L, FDXS-L Series SiUS12-928_B To change the temperature setting Press or . • The displayed items on the LCD will change whenever either one of the buttons is pressed. COOL operation 64-90˚F (18-32˚C) HEAT operation 50-86˚F (10-30˚C) AUTO operation 64-86˚F (18-30˚C) Press to raise the temperature and press temperature. to lower the DRY or FAN operation The temperature setting is not variable.
SiUS12-928_B 5.3 CDXS-L, FDXS-L Series Adjusting the Airflow Rate Adjusting the Airflow Rate To adjust the airflow rate setting Press . • Each pressing of Auto advances the airflow rate setting in sequence. Indoor unit quiet High Middle high Low Middle low Middle • When the airflow is set to “ ”, indoor unit quiet operation will start and the noise from the unit will become quieter. • In indoor unit quiet operation, the airflow rate is set to a weak level.
CDXS-L, FDXS-L Series 5.4 SiUS12-928_B POWERFUL Operation POWERFUL Operation POWERFUL operation quickly maximizes the cooling (heating) effect in any operation mode. You can get the maximum capacity. To start POWERFUL operation Press during operation. • POWERFUL operation ends in 20 minutes. Then the system automatically operates again with the previous settings which were used before POWERFUL operation. •“ ” is displayed on the LCD. To cancel POWERFUL operation Press •“ again.
SiUS12-928_B 5.5 CDXS-L, FDXS-L Series OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET Operation OUTDOOR UNIT QUIET operation lowers the noise level of the outdoor unit by changing the frequency and fan speed on the outdoor unit. This function is convenient during night. To start OUTDOOR UNIT QUIET operation Press • “ . ” is displayed on the LCD. To cancel OUTDOOR UNIT QUIET operation Press • “ [Example] again. ” is no longer displayed on the LCD.
CDXS-L, FDXS-L Series 5.6 SiUS12-928_B ECONO Operation ECONO Operation ECONO operation is a function which enables efficient operation by limiting the maximum power consumption value. This function is useful for cases in which attention should be paid to ensure a circuit breaker will not trip when the product runs alongside other appliances. To start ECONO operation Press •“ during operation. ” is displayed on the LCD. To cancel ECONO operation Press •“ again.
SiUS12-928_B 5.7 CDXS-L, FDXS-L Series OFF TIMER Operation OFF TIMER Operation Timer functions are useful for automatically switching the air conditioner on or off at night or in the morning. You can also use OFF TIMER and ON TIMER in combination. To use OFF TIMER operation • Check that the clock is correct. If not, set the clock to the present time. 1. Press . “ ” is displayed on the LCD. “ •“ ” blinks. ” is no longer displayed on the LCD. 2.
CDXS-L, FDXS-L Series 5.8 SiUS12-928_B ON TIMER Operation ON TIMER Operation To use ON TIMER operation • Check that the clock is correct. If not, set the clock to the present time. 1. Press . “ ” is displayed on the LCD. “ •“ ” blinks. ” is no longer displayed on the LCD. 2. Press until the time setting reaches the point you like. • Each pressing of either button increases or decreases the time setting by 10 minutes. Holding down either button changes the setting rapidly. 3. Press again.
SiUS12-928_B 5.9 CDXS-L, FDXS-L Series Note for Multi System Note for Multi System Multi system has one outdoor unit connected to multiple indoor units. Selecting the operation mode With the priority room setting present but inactive or not present. When more than one indoor unit is operating, priority is given to the first unit that was turned on. In this case, set the units that are turned on later to the same operation mode as the first unit.
CDXS-L, FDXS-L Series SiUS12-928_B COOL/HEAT mode lock The COOL/HEAT mode lock requires initial programming during installation. Please consult your authorized dealer for assistance. The COOL/HEAT mode lock sets the unit forcibly to either COOL or HEAT operation. This function is convenient when you wish to set all indoor units connected to the multi system to the same operation mode. NOTE • The COOL/HEAT mode lock cannot be activated together with the priority room setting.
SiUS12-928_B CDXS-L, FDXS-L Series 5.
SiUS12-928_B Part 6 Service Diagnosis 1. Troubleshooting with LED .......................................................................135 1.1 Indoor Unit................................................................................................ 135 1.2 Outdoor Unit ............................................................................................. 136 2. Problem Symptoms and Measures .........................................................137 3. Service Check Function ..................
SiUS12-928_B 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 7.10 7.11 7.12 7.13 7.14 7.15 Service Diagnosis Fan Motor Connector Check .................................................................... 192 Hall IC Check ........................................................................................... 192 Power Supply Waveform Check............................................................... 193 Outdoor Electronic Expansion Valve Check.............................................
Troubleshooting with LED SiUS12-928_B 1. Troubleshooting with LED 1.1 Indoor Unit Operation Lamp The operation lamp blinks when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated, or when the thermistor malfunctions. 2. When a signal transmission error occurs between the indoor and outdoor units. In either case, conduct the diagnostic procedure described in the following pages.
SiUS12-928_B 1.2 Troubleshooting with LED Outdoor Unit Service monitor PCB 2MXS18GVJU LED A LED 1 LED 2 LED 3 LED 4 3MXS24JVJU 4MXS32GVJU (R17364) The outdoor unit has a green LED (LED A) and red LEDs (LED 1 ~ LED 4) on the PCB. When the microcomputer works in order, the LED A blinks, and when the system is in normal condition, the red LEDs are OFF. Even after the error is canceled and the unit operates in normal condition, the LED indication remains.
Problem Symptoms and Measures SiUS12-928_B 2. Problem Symptoms and Measures Problem Symptom Check Item None of the units operates. Check the power supply. Check the types of the indoor units. Check the outdoor temperature. Operation sometimes stops. Diagnose with remote controller indication Check the remote controller addresses. Check the power supply. Check the outdoor temperature. Some indoor units do not operate. Units operate but do not cool, or do not heat.
SiUS12-928_B Service Check Function 3. Service Check Function 3.1 ARC452 Series Remote Controller Check Method 1 1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature display screen. Timer cancel button < ARC452 Series > (R14460) 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below. No. 1 2 3 4 5 6 7 8 9 10 11 12 Note: Service Diagnosis Code 00 U4 L5 E6 H6 H0 A6 E7 U0 F3 A5 F6 No.
Service Check Function Check Method 2 SiUS12-928_B 1. Press the 3 buttons (TEMP, TEMP, MODE) at the same time to enter the diagnosis mode. (R14550) The left-side number blinks. (R9430) 2. Press the [TEMP] or button and change the number until you hear the two consecutive beeps or the long beep. (R14551) 3. Diagnose by the sound. beep : The left-side number does not correspond with the error code.
SiUS12-928_B Service Check Function 5. Press the [TEMP] or buttonand change the number until you hear the long beep. (R14547) 6. Diagnose by the sound. beep : The left-side number does not correspond with the error code. two consecutive beeps : The left-side number corresponds with the error code but the right-side number does not. long beep : Both the left-side and right-side number corresponds with the error code. 7. Determine the error code.
Service Check Function 3.2 SiUS12-928_B ARC433 Series Remote Controller Check Method 1 1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature display screen. Timer cancel button < ARC433 Series > (R14555) 2. Press the timer cancel button repeatedly until a long beep sounds. The code indication changes in the sequence shown below. No. 1 2 3 4 5 6 7 8 9 10 11 Note: 141 Code 00 U4 F3 E6 L5 A6 E5 F6 C9 U0 E7 No.
SiUS12-928_B Service Check Function Check Method 2 1. Press the center of the [TEMP] button and the [MODE] button at the same time to enter the diagnosis mode. (R4272) The left-side number blinks. (R14967) 2. Press the [TEMP] or button and change the number until you hear the two consecutive beeps or the long beep. (R4274) 3. Diagnose by the sound. beep : The left-side number does not correspond with the error code.
Service Check Function SiUS12-928_B 5. Press the [TEMP] or buttonand change the number until you hear the long beep. (R4277) 6. Diagnose by the sound. beep : The left-side number does not correspond with the error code. two consecutive beeps : The left-side number corresponds with the error code but the rightside number does not. long beep : Both the left-side and right-side numbers correspond with the error code. 7. Determine the error code.
SiUS12-928_B Code Indication on Remote Controller 4. Code Indication on Remote Controller 4.
Code Indication on Remote Controller 4.
SiUS12-928_B Troubleshooting for Indoor Unit 5. Troubleshooting for Indoor Unit 5.1 Indoor Unit PCB Abnormality Remote Controller Display A1 Method of Malfunction Detection The system checks if the circuit works properly within the microcomputer of the indoor unit. Malfunction Decision Conditions The system cannot set the internal settings.
Troubleshooting for Indoor Unit SiUS12-928_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check the combination of the indoor and outdoor unit. OK? NO Match the compatible models. YES Check the connection of connectors (See Note.). OK? ∗ To secure the connection, once disconnect the connector and then reconnect it. YES Check the power supply voltage. NO Voltage as rated? NO Correct the power supply.
SiUS12-928_B 5.2 Troubleshooting for Indoor Unit Freeze-up Protection Control or Heating Peak-cut Control Remote Controller Display A5 Method of Malfunction Detection Freeze-up protection control During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor.
Troubleshooting for Indoor Unit SiUS12-928_B Troubleshooting Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Caution Check No.01 Refer to P.191 Check the air passage. YES Is there any short circuit? Provide sufficient air passage. NO Check the air filter. Dirty? YES Clean the air filter. NO Check the dust accumulation on the indoor heat exchanger. Dirty? YES Clean the indoor heat exchanger. NO Check No.
SiUS12-928_B 5.3 Troubleshooting for Indoor Unit Fan Motor or Related Abnormality 5.3.1 DC Motor (CTXS/FTXS Series) Remote Controller Display A6 Method of Malfunction Detection The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation. Malfunction Decision Conditions The detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
Troubleshooting for Indoor Unit SiUS12-928_B Troubleshooting Caution Check No.02 Refer to P.192 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power supply and rotate the fan by hand. Does the fan rotate smoothly? NO Replace the indoor fan motor. YES Turn the power on and start operation. Does the fan rotate? Turn off the power supply NO and disconnect the fan motor connector, then turn the power on.
SiUS12-928_B Troubleshooting for Indoor Unit 5.3.2 AC Motor (CDXS/FDXS Series) Remote Controller Display A6 Method of Malfunction Detection The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor operation. Malfunction Decision Conditions The detected rotation speed does not reach the demanded rotation speed of the target tap, and is less than 50% of the maximum fan motor rotation speed.
Troubleshooting for Indoor Unit 5.4 SiUS12-928_B Thermistor or Related Abnormality (Indoor Unit) Remote Controller Display C4, C9 Method of Malfunction Detection The temperatures detected by the thermistors are used to determine thermistor errors. Malfunction Decision Conditions The thermistor input is more than 4.96 V or less than 0.04 V during compressor operation. Supposed Causes Disconnection of connector Defective thermistor Defective indoor unit PCB Troubleshooting Caution Check No.
SiUS12-928_B 5.5 Troubleshooting for Indoor Unit Signal Transmission Error (between Indoor Unit and Outdoor Unit) Remote Controller Display U4 Method of Malfunction Detection The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is checked whether it is normal. Malfunction Decision Conditions The data sent from the outdoor unit cannot be received normally, or the content of the data is abnormal.
Troubleshooting for Indoor Unit 5.6 SiUS12-928_B Unspecified Voltage (between Indoor Unit and Outdoor Unit) Remote Controller Display UA Method of Malfunction Detection The supply power is detected for its requirements (different from pair type and multi type) by the indoor / outdoor transmission signal. Malfunction Decision Conditions The pair type and multi type are interconnected.
SiUS12-928_B Troubleshooting for Outdoor Unit 6. Troubleshooting for Outdoor Unit 6.1 Refrigerant Shortage Remote Controller Display U0 Outdoor Unit LED Display A5 13 23 34 44 Method of Malfunction Detection Refrigerant shortage detection I : Refrigerant shortage is detected by checking the input current value and the compressor output frequency. If the refrigerant is short, the input current is smaller than the normal value.
Troubleshooting for Outdoor Unit Troubleshooting SiUS12-928_B 18 class Caution Check No.01 Refer to P.191 Check No.12 Refer to P.194 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Any thermistor disconnected? NO Stop valve closed? YES Replace the thermistor(s) in position. ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor ∗ Room temperature thermistor ∗ Outdoor temperature thermistor YES Open the stop valve.
SiUS12-928_B Troubleshooting Troubleshooting for Outdoor Unit 24/32 class Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check No.01 Refer to P.191 Any thermistor disconnected? Check No.12 Refer to P.194 NO Stop valve closed? YES Replace the thermistor(s) in position. ∗ Discharge pipe thermistor ∗ Indoor or outdoor heat exchanger thermistor ∗ Room temperature thermistor ∗ Outdoor temperature thermistor YES Open the stop valve.
Troubleshooting for Outdoor Unit 6.2 SiUS12-928_B Low-voltage Detection or Over-voltage Detection Remote Controller Display U2 Outdoor Unit LED Display A5 14 23 33 44 Method of Malfunction Detection Indoor Unit The zero-cross detection of the power supply is evaluated by the indoor unit PCB. Outdoor Unit Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit.
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the power supply voltage. Voltage as rated? NO Correct the power supply. YES Check the connection of the compressor harness. Loose or disconnected? YES Reconnect the harness. NO (Precaution before turning on the power again) Make sure the power has been off for at least 30 seconds. Turn on the power again.
Troubleshooting for Outdoor Unit 6.3 SiUS12-928_B Signal Transmission Error (on Outdoor Unit PCB) (24/32 Class Only) Remote Controller Display U7 Outdoor Unit LED Display A5 13 24 34 44 Method of Malfunction Detection Communication error between microcomputer mounted on the main PCB and PM1. Malfunction Decision Conditions The abnormality is determined when the data sent from the PM1 can not be received for 9 seconds.
SiUS12-928_B 6.4 Troubleshooting for Outdoor Unit Unspecified Voltage (between Indoor Unit and Outdoor Unit) / Anti-icing Function in Other Rooms UA, UH Remote Controller Display Outdoor Unit LED Display A5 13 23 33 43 Method of Malfunction Detection A wrong connection is detected by checking the combination of indoor and outdoor units on the microcomputer.
Troubleshooting for Outdoor Unit 6.5 SiUS12-928_B Anti-icing Function Remote Controller Display A5 Outdoor Unit LED Display A5 14 23 34 44 Method of Malfunction Detection During cooling operation, indoor unit icing is detected by checking the temperatures sensed by the indoor heat exchanger thermistor and room temperature thermistor that are located in a shut-down room. Malfunction Decision Conditions In cooling operation, the both conditions (A) and (B) are met for 5 minutes.
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting Caution Check No.01 Refer to P.191 Check No.12 Refer to P.194 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Check the wiring and piping. Wrong wiring or piping? YES Activate the wiring error check function. NO Check No. 12 Check the outdoor electronic expansion valve. Functioning? NO Replace the outdoor electronic expansion valve or coil. YES Check No.
Troubleshooting for Outdoor Unit 6.6 SiUS12-928_B Outdoor Unit PCB Abnormality (24/32 Class Only) Remote Controller Display E1 Outdoor Unit LED Display A5 14 24 34 43 Method of Malfunction Detection Detect within the program of the microcomputer. Malfunction Decision Conditions The program of the microcomputer is in abnormal running order.
SiUS12-928_B 6.7 Troubleshooting for Outdoor Unit OL Activation (Compressor Overload) Remote Controller Display E5 Outdoor Unit LED Display A5 14 23 34 43 Method of Malfunction Detection A compressor overload is detected through compressor OL. Malfunction Decision Conditions If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other error The operating temperature condition is not specified.
Troubleshooting for Outdoor Unit 6.8 SiUS12-928_B Compressor Lock Remote Controller Display E6 Outdoor Unit LED Display A5 13 24 34 43 Method of Malfunction Detection A compressor lock is detected by checking the compressor running condition through the position detection circuit. Malfunction Decision Conditions Judging from the current waveform generated when high-frequency voltage is applied to the compressor. If the error repeats, the system is shut down.
SiUS12-928_B 6.9 Troubleshooting for Outdoor Unit DC Fan Lock Remote Controller Display E7 Outdoor Unit LED Display A5 14 24 34 44 Method of Malfunction Detection An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Malfunction Decision Conditions The fan does not start in 30 seconds even when the fan motor is running. If the error repeats, the system is shut down.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.10 Input Overcurrent Detection Remote Controller Display E8 Outdoor Unit LED Display A5 13 24 33 44 Method of Malfunction Detection Detected by checking the input current value Malfunction Decision Conditions The input current is at a certain value (depending on the condition) for 2.5 seconds. The compressor halts if the error occurs, and restarts automatically after 3-minute standby.
SiUS12-928_B Troubleshooting for Outdoor Unit 6.11 Four Way Valve Abnormality (18 Class Only) Remote Controller Display EA Outdoor Unit LED Display Aj 1i 2h 3h 4h Method of Malfunction Detection The liquid pipe thermistor and the outdoor heat exchanger thermistor are checked to see if they function within their normal ranges in the operating mode. Malfunction Decision Conditions Either of the following conditions occurs 6 minutes after the compressor has started.
Troubleshooting for Outdoor Unit SiUS12-928_B Troubleshooting Caution Check No.01 Refer to P.191 Check No.13 Refer to P.195 Check No.14 Refer to P.195 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Four way-valve coil disconnected (loose)? YES Correct the four-way valve coil. NO Harness out of connector? YES Reconnect the harness. NO Check the continuity of the four-way valve coil and harness.
SiUS12-928_B Troubleshooting for Outdoor Unit 6.12 Discharge Pipe Temperature Control Remote Controller Display F3 Outdoor Unit LED Display Aj 1i 2h 3i 4h Method of Malfunction Detection Detected by the discharge pipe thermistor Malfunction Decision Conditions If the temperature detected by the discharge pipe thermistor rises above A, the compressor stops. The error is cleared when the discharge pipe temperature is dropped below B. A 248°F(120°C) B 224.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.13 High Pressure Control in Cooling Remote Controller Display F6 Outdoor Unit LED Display Aj 1i 2h 3i 4i Method of Malfunction Detection High pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Malfunction Decision Conditions The temperature sensed by the outdoor heat exchanger thermistor rises above about 65°C (149°F).
SiUS12-928_B Troubleshooting for Outdoor Unit 6.14 Compressor Sensor System Abnormality (24/32 Class Only) Remote Controller Display H0 Outdoor Unit LED Display Aj 1i 2i 3h 4h Method of Malfunction Detection Fault condition is identified by the supply voltage and the DC voltage which is detected before the compressor startup. Fault condition is identified by the compressor current which is detected right after the compressor startup. If the error repeats, the system is shut down.
Troubleshooting for Outdoor Unit SiUS12-928_B Troubleshooting Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power. Reactor connection check Connection OK? NO Connect the reactor properly. YES Compressor connection check Connection OK? NO Connect the compressor properly. YES Disconnect the reactor from the outdoor unit PCB and measure the resistance value between reactor terminals with tester.
SiUS12-928_B Troubleshooting for Outdoor Unit 6.15 Position Sensor Abnormality Remote Controller Display H6 Outdoor Unit LED Display Aj 1i 2i 3h 4h Method of Malfunction Detection A compressor start-up failure is detected by checking the compressor running condition through the position detection circuit. Malfunction Decision Conditions If the error repeats, the system is shut down.
Troubleshooting for Outdoor Unit Troubleshooting SiUS12-928_B 18 class Caution Check No.15 Refer to P.196 Check No.18 Refer to P.198 Check No.20 Refer to P.199 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power. Check the power supply voltage. Voltage as rated? NO Correct the power supply. YES Check No. 18 Check the discharge pressure. OK? NO Replace the stop valve. YES Check No.
SiUS12-928_B Troubleshooting Troubleshooting for Outdoor Unit 24/32 class Caution Check No.15 Refer to P.196 Check No.18 Refer to P.198 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power. Check the power supply voltage. Voltage as rated? NO Correct the power supply. YES Check No. 18 Check the discharge pressure. OK? NO Replace the stop valve. YES Check the connection.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.16 CT or Related Abnormality Remote Controller Display H8 Outdoor Unit LED Display Aj 1i 2i 3h 4h Method of Malfunction Detection A CT or related error is detected by checking the compressor running frequency and CT-detected input current. Malfunction Decision Conditions The compressor running frequency is more than A Hz and input current is less than B A. 18 class 24/32 class A (Hz) 55 32 B (A) 1.25 0.
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting Check No.15 Refer to P.196 Check No.21 Refer to P.200 Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power and turn it on again. Start operation. ∗ Running current as shown at right with relay cable 1 or 2? YES Current (guideline) Replace the outdoor unit PCB.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.17 Thermistor or Related Abnormality (Outdoor Unit) Remote Controller Display H9, J3, J6, J8, J9, P4 Outdoor Unit LED Display Aj 1i 2i 3h 4h Method of Malfunction Detection This type of error is detected by checking the thermistor input voltage to the microcomputer. A thermistor error is detected by checking the temperature sensed by each thermistor. Malfunction Decision Conditions The thermistor input is above 4.96 V or below 0.
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting Caution Check No.01 Refer to P.191 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn on the power again. Error displayed again on remote controller? NO Reconnect the connectors or thermistors. YES Check No. 01 Check the thermistor resistance value. NO Normal? J3 error: The discharge pipe temperature is lower than the heat exchanger temperature.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.18 Electrical Box Temperature Rise Remote Controller Display L3 Outdoor Unit LED Display Aj 1i 2i 3h 4i Method of Malfunction Detection An electrical box temperature rise is detected by checking the radiation fin thermistor with the compressor off. Malfunction Decision Conditions With the compressor off, the radiation fin temperature is above A. The error is cleared when the temperature drops below B.
SiUS12-928_B Troubleshooting Troubleshooting for Outdoor Unit 18 class Caution Check No.01 Refer to P.191 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. WARNING To cool the electrical components, the outdoor fan starts when the radiation fin temperature rises above C and stops when it drops below B. Turn off the power and turn it on again. Check No.17 Refer to P.198 Error again or outdoor fan activated? Check No.19 Refer to P.
Troubleshooting for Outdoor Unit Troubleshooting 24/32 class Caution Check No.17 Refer to P.198 SiUS12-928_B Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. WARNING To cool the electrical components, the outdoor fan starts when the radiation fin temperature rises above C and stops when it drops below B. Turn off the power and turn it on again. Check No.19 Refer to P.
SiUS12-928_B Troubleshooting for Outdoor Unit 6.19 Radiation Fin Temperature Rise Remote Controller Display L4 Outdoor Unit LED Display Aj 1h 2h 3h 4i Method of Malfunction Detection A radiation fin temperature rise is detected by checking the radiation fin temperature with the compressor on. Malfunction Decision Conditions The radiation fin temperature with the compressor on is above A. The error is cleared when the temperature drops below B.
Troubleshooting for Outdoor Unit Troubleshooting 18 class Caution Check No.01 Refer to P.191 Check No.17 Refer to P.198 SiUS12-928_B Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. (Precaution before turning on the power again) Make sure the power has been off for at least 30 seconds. Turn off the power and turn it on again to start the system. Check No.19 Refer to P.
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting Check No.17 Refer to P.198 24/32 class Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. Turn off the power and turn it on again to start the system. Check No.19 Refer to P.199 Error displayed again? YES Has the PCB been replaced? NO YES NO ∗ Silicon grease Part No.: 1172698 Check the radiation fin temperature.
Troubleshooting for Outdoor Unit SiUS12-928_B 6.20 Output Overcurrent Detection Remote Controller Display L5 Outdoor Unit LED Display Aj 1h 2h 3i 4h Method of Malfunction Detection An output overcurrent is detected by checking the current that flows in the inverter DC section. Malfunction Decision Conditions A position signal error occurs while the compressor is running. A speed error occurs while the compressor is running.
SiUS12-928_B Troubleshooting for Outdoor Unit Troubleshooting Caution Check No.15 Refer to P.196 Check No.17 Refer to P.198 Check No.18 Refer to P.198 Check No.22 Refer to P.201 Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged. ∗ An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.
Check SiUS12-928_B 7. Check 7.1 Thermistor Resistance Check Check No.01 Disconnect the connectors of the thermistors from the PCB, and measure the resistance of each thermistor using tester. The relationship between normal temperature and resistance is shown in the table and the graph below. The data is for reference purpose only. Temperature (°F/°C ) –4 / –20 5 / –15 14 / –10 23 / –5 32 / 0 41 / 5 50 / 10 59 / 15 68 / 20 77 / 25 86 / 30 95 / 35 104 / 40 113 / 45 122 / 50 Resistance (k) 197.8 148.
SiUS12-928_B 7.2 Check Fan Motor Connector Check Check No.02 CTXS/FTXS Series 1. Check the connection of connector. 2. Check motor power supply voltage output (pins 4 - 7). 3. Check motor control voltage (pins 4 - 3). 4. Check rotation command voltage output (pins 4 - 2). 5. Check rotation pulse input (pins 4 - 1). S1 7 6 5 4 3 2 1 Motor power supply voltage (310 ~ 340 VDC) Unused Unused GND Motor control voltage (15 VDC) Rotation command voltage (1~ 5 VDC) Rotation pulse input (R12404) 7.
Check 7.4 SiUS12-928_B Power Supply Waveform Check Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check the waveform disturbance. Check to see if the power supply waveform is a sine wave (Fig.1). Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2) [Fig.1] [Fig.
SiUS12-928_B 7.5 Check Outdoor Electronic Expansion Valve Check Check No.12 Conduct the followings to check the outdoor electronic expansion valve (EV). 1. Check to see if the EV connector is correctly inserted in the PCB. Match the EV unit number and the connector number. 2. Turn the power off and on again, and check to see if all the EVs generate latching sound. 3.
Check 7.6 SiUS12-928_B Four Way Valve Performance Check Check No.13 Turn off the power and turn it on again. Start heating operation. S80 voltage at 208/230 VAC with compressor on? (Fig. 1) * Four-way valve coil Cooling / dry : No continuity Heating : Continuity NO Replace the outdoor unit PCB. YES Disconnect the connector for the four way valve coil and check the continuity. Four-way valve coil resistance at 1000~2000 W? NO Replace the four-way valve coil. YES Replace the four-way valve.
SiUS12-928_B 7.8 Check “Inverter Checker” Check Check No.15 Characteristics If abnormal stop occurs due to compressor startup failure or overcurrent output when using an inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or some other failure (control PCB, power module, etc.). The inverter checker makes it possible to judge the cause of trouble easily and securely.
Check SiUS12-928_B Diagnose method (Diagnose according to 6 LEDs lighting status.) (1) If all the LEDs are lit uniformly, the compressor is defective. Replace the compressor. (2) If the LEDs are not lit uniformly, check the power module. Refer to Check No.22. (3) If NG in Check No.22, replace the power module. 18 class: Replace the power module (SPM). 24/32 class: Replace the main PCB. The power module (PM1) is united with the main PCB.
SiUS12-928_B Check 7.10 Installation Condition Check Check No.17 Installation condition check Check the allowable dimensions of the air suction and discharge area. NG Change the installation location or direction. OK Is the discharged air short-circuited? YES Change the installation location or direction. NO Is the outdoor heat exchanger very dirty? YES Clean the outdoor heat exchanger.
Check SiUS12-928_B 7.12 Outdoor Fan System Check Check No.19 Check the outdoor unit fan system. Outdoor unit fan running? NO Fan motor lead wire connector disconnected? YES YES Reconnect the connector. NO Outdoor unit fan system functioning. Go to Check No. 16. (R15128) 7.13 Main Circuit Short Check Check No.20 Note: Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is approx. 0 V before checking.
SiUS12-928_B Check 7.14 Capacitor Voltage Check Check No.21 Before this check, be sure to check the main circuit for short circuit. With the circuit breaker still on, measure the voltage according to the drawing of the model in question. Be careful never to touch any live parts. 18 class Multimeter (DC. voltage range) >PS< TB2 P2 TB3 N1 S40 S90 S92 S93 S80 S20 S21 S22 (R11308) 24/32 class Multimeter (DC.
Check SiUS12-928_B 7.15 Power Module Check Check No.22 Note: Check to make sure that the voltage between (+) and (–) of the power module (PM1) is approx. 0 V before checking. Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector. Follow the procedure below to measure resistance between the terminals of the power module and the terminals of the compressor with a multi-tester.
SiUS12-928_B Part 7 Removal Procedure 1. Outdoor Unit: 2MXS18GVJU ..................................................................203 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Removal of Outer Panels ......................................................................... 203 Removal of Electrical Box ........................................................................ 204 Removal of PCBs ..................................................................................... 209 Removal of Fan Motor.......
Outdoor Unit: 2MXS18GVJU SiUS12-928_B 1. Outdoor Unit: 2MXS18GVJU 1.1 Removal of Outer Panels Procedure Warning Procedure Step 1 Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Points Appearance features (R2159) 2 3 Remove the 4 screws of the top panel and the 6 screws of the front panel. Remove the 4 screws of the discharge grille. Top panel Discharge grille 4 Front panel (R10351) Remove the 2 screws of the stop valve cover.
SiUS12-928_B 1.2 Outdoor Unit: 2MXS18GVJU Removal of Electrical Box Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step Points The US model has a protection plate on the right side panel. Remove the 2 screws to remove the protection plate. 1. Disconnect the connecting wires.
Outdoor Unit: 2MXS18GVJU SiUS12-928_B Procedure Step 2 Disconnect the connector for the four-way valve coil [S80]. Points When reassembling, insert the clamp into the hole as below. [S80] Clamp (R17397) (R17398) 3 Disconnect the connectors for the thermistors [S90] [S92] [S93] and the overload protector [S40].
SiUS12-928_B Procedure Step 4 Outdoor Unit: 2MXS18GVJU Points Disconnect the relay connector of the compressor. (R17065) 5 Release the clamp with pliers. (R17066) 6 Disconnect the reactor lead wires.
Outdoor Unit: 2MXS18GVJU SiUS12-928_B Procedure Step 3. Remove the electrical box. 1 Remove the screw of the shield plate. Points Shield plate (R17345) 2 Unfasten the 2 hooks and remove the shield plate. (R17346) Hook 3 Remove the screw on the right side of the electrical box. (R10361) 4 Remove the screw on the front side of the electrical box.
SiUS12-928_B Procedure Step 5 Outdoor Unit: 2MXS18GVJU Points Remove the drip proof cover. Drip proof cover (R2174) 6 Disconnect the connector for the fan motor [S70] from the inverter PCB (MID2). Release the fan motor lead wire from the hooks. Inverter PCB (MID2) [S70] (R2175) 7 Remove the electrical box.
Outdoor Unit: 2MXS18GVJU 1.3 SiUS12-928_B Removal of PCBs Procedure Warning Procedure Step 1 Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Points When reassembling, insert the base bar into the hole of the main PCB. Remove the screw of the main PCB, and unfasten the 2 hooks. Main PCB Base bar (R2177) 2 Unfasten the hook of the terminal board, and open the terminal board.
SiUS12-928_B Outdoor Unit: 2MXS18GVJU Procedure Step 5 Lift up the main PCB. 6 Disconnect the connectors [S31] [S32] [S33] [S71] [H1] [H2]. Points (R2181) [S31] [S71] [S33] (R10362) [S32] [H1] (yellow) [H2] (blue) (R10363) 7 Refer to page 30 for detail. The figure shows the main PCB. [S93] [S92] [S90] FU2 (3.
Outdoor Unit: 2MXS18GVJU Procedure Step 8 SiUS12-928_B Points Unfasten the 2 hooks and remove the service monitor PCB. Hook Priority room setting switch (SW4) LED A LED 1 LED 2 LED 3 LED 4 Wiring error check switch (SW3) Forced operation [ON/OFF] switch (SW1) NIGHT QUIET mode setting switch (SW5) Operation mode switch (SW2) Hook (R17348) 9 Remove the 7 screws and remove the inverter PCB (MID2). Inverter PCB (MID2) FU201 (3.
SiUS12-928_B 1.4 Outdoor Unit: 2MXS18GVJU Removal of Fan Motor Procedure Warning Procedure Step 1 Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Points Remove the nut and remove the outdoor fan. Preparation Disconnect the connector for the fan motor and release the fan motor lead wire according to the “Removal of Electrical Box”. When reassembling, align the mark of outdoor fan with the D-cut section of motor shaft.
Outdoor Unit: 2MXS18GVJU 1.5 SiUS12-928_B Removal of Sound Blankets Procedure Warning Procedure Step 1 Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Points Remove the 5 screws of the right side panel. Right side panel (R10364) 2 Release the clamp with pliers. (R16508) 3 Remove the 2 screws of the partition plate and remove it.
SiUS12-928_B Procedure Step 4 Outdoor Unit: 2MXS18GVJU Remove the sound blankets (top upper, top inner, outer, inner). Points Carefully remove the sound blanket, which is easily torn in the piping section.
Outdoor Unit: 2MXS18GVJU 1.6 Removal of Coils / Thermistors Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1 SiUS12-928_B Remove the screw and remove the four-way valve coil. Points Four way valve coil (R2194) 2 Remove the screw and remove the defrost solenoid valve coil. Defrost solenoid valve coil (R2195) 3 Pull out the electronic expansion valve coil for each room.
SiUS12-928_B Procedure Step 5 Outdoor Unit: 2MXS18GVJU Points Place the thermistor so that its edge comes up to the edge of the fixture. Be careful not to lose the clip and fixture for the thermistors. Remove the putty, and remove each thermistor. Liquid pipe thermistor Gas pipe thermistor 6 (R17406) Release the wire harnesses.
Outdoor Unit: 2MXS18GVJU 1.7 SiUS12-928_B Removal of Four-Way Valve / Defrost Solenoid Valve Procedure Warning Procedure Step 1 2 Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Points Remove the screw and remove the four way valve coil. Warning Be careful not to burn yourself with the pipes and other parts that are heated by the gas brazing machine. Remove the screw and remove the defrost solenoid valve coil.
SiUS12-928_B Procedure Step 6 Outdoor Unit: 2MXS18GVJU Disconnect the 2 brazed points, first (e), and then (f). Remove the defrost solenoid valve. Points Note: Do not use a metal saw for cutting pipes or sawdust will enter the circuit. (f) (e) When withdrawing the pipes, be careful not to pinch them firmly with pliers. The pipes may get deformed. (R12395) Removal Procedure Provide a protective sheet or a steel plate so that the brazing flame cannot influence peripheries.
Outdoor Unit: 2MXS18GVJU 1.8 SiUS12-928_B Removal of Distributor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step Points Before working, make sure that the refrigerant gas is empty in the circuit. Be sure to apply nitrogen replacement when heating up the brazed part. 1 Remove the putty. 2 Warning Be careful not to burn yourself with the pipes and other parts that are heated by the gas brazing machine.
SiUS12-928_B 1.9 Outdoor Unit: 2MXS18GVJU Removal of Compressor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1 Remove the terminal cover. 2 Disconnect the compressor lead wires. Points Terminal cover (R2205) U (red) N (brown) W (blue) V (yellow) (R17408) 3 4 Remove the 2 sheets of putty. Putty Remove the 3 nuts.
Outdoor Unit: 2MXS18GVJU SiUS12-928_B Procedure Step Before working, make sure that the refrigerant gas is empty in the circuit. Be sure to apply nitrogen replacement when heating up the brazed part. 5 Disconnect the brazed part (a) at discharge side of the compressor. 6 Disconnect the brazed part (b) at suction side of the compressor. 7 Lift the compressor up and remove it. Points Warning Be careful not to get yourself burnt with pipes and other parts that are heated by the gas brazing machine.
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU 2. Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU 2.1 Removal of Outer Panels Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step Points Appearance features (R6368) 1. Remove the suction grille. 1 Unfasten the 2 hooks at the bottom first. The hooks are secured in the clearances of the outdoor heat exchanger fins.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 2 SiUS12-928_B Slide the suction grille downward to unfasten the 3 top hooks. Points Hook (R14613) 3 Remove the suction grille. (R6372) 2. Remove the top panel. 1 Remove the 4 screws on the back and the screw on the left side.
SiUS12-928_B Procedure Step 2 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Points Remove the 2 screws on the front and the screw on the right side panel. Right side panel (R6374) 3 Lift the top panel and remove it. (R6375) 3. Remove the right side panel. 1 Remove the 5 screws.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 2 SiUS12-928_B Points Slide the right side panel downward to unfasten the 2 hooks on the back side.
SiUS12-928_B Procedure Step 3 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Points The US model has a service lid on the stop valve mounting plate. Remove the 2 screws to remove the service lid. Remove the right side panel. Screw Service lid (R10372) This model has a conduit mounting plate. Lock nut (R10441) Knockout hole Conduit mounting plate Conduit (R17351) 4. Remove the front panel (2). 1 Remove the 2 screws.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Procedure Step Points (R6383) 3 Remove the front panel (2). (R10375) 5. Remove the front panel (1). 1 Remove the 4 screws on the discharge grille. Remove the discharge grille and outdoor fan first to remove the front panel (1). Front Panel (1) Discharge grille (R10376) 2 Pull the bottom of the discharge grille.
SiUS12-928_B Procedure Step 3 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Points Slide the discharge grille downward to unfasten the 2 hooks at the top. Hook (R17173) 4 Remove the discharge grille. (R10380) 5 Nut size : M8 Remove the nut and remove the outdoor fan. 13 mm (0.51 inch) Outdoor fan (R17410) When reassembling, align the mark of the outdoor fan with the D-cut section of the motor shaft.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 6 SiUS12-928_B Remove the 2 screws of the partition plate (1). Points Partition plate (1) (R10382) 7 Remove the screw at the bottom left of the front panel (1). Front panel (1) (R10383) 8 Remove the screw at the bottom of the left side.
SiUS12-928_B Procedure Step 9 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Points Remove the screw at the bottom of the back side. (R6394) 10 The front panel (1) has a hook. Lift the front panel (1). Hook (R17174) 11 Remove the front panel (1). (R10385) Be sure to detach the front panel (1) carefully so as not to deform it.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Procedure Step Points 6. Remove the rear panel. 1 Remove the 2 screw on the partition plate (2). Rear panel Partition plate (2) (R10386) 2 When reassembling, bundle the wires with clamp. When reassembling, pass the wires through the partition plate (2). Slide the partition plate (2) to the left and remove it.
SiUS12-928_B Procedure Step 4 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Points Release the thermistor wire from the groove. Groove (R10389) 5 Remove the 3 screws on the rear panel. (R10390) 6 Remove the screw on the bottom frame.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 7 SiUS12-928_B Points Remove the screw on the stop valve mounting plate. Stop valve mounting plate (R10392) 8 Lift the rear panel to unfasten the 2 hooks. Hook (R12918) 9 Remove the rear panel.
SiUS12-928_B 2.2 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Removal of Electrical Box Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1 Remove the 2 screws to detach the ground wires. 2 Disconnect the connector for the fan motor [S70]. 3 Release the fan motor lead wire. Points (R10396) [S70] (R10397) : When reassembling, do not Fan motor lead wire use these 2 hooks.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 4 SiUS12-928_B Points Disconnect the connector for the four-way valve coil [S80]. [S80] Pull out the clamp. Clamp (R10398) 5 Disconnect the 4 connectors for the electronic expansion valve coils (for room A, B, C, D) and pull out the clamp. A B C A : [S20] (white) B : [S21] (red) C : [S22] (blue) D : [S23] (yellow) D Clamp The 3MXS model does not have [S23]. When reassembling, insert each clamp into the hole.
SiUS12-928_B Procedure Step 7 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Disconnect the connector for the gas pipe thermistors [S92] and pull out the clamp. Points When reassembling, insert the clamp into the hole. [S92] [S92] Clamp (R17356) (R10537) 8 Disconnect the connector for the thermistors [S90] and pull out the clamp. When reassembling, insert the clamp into the hole. [S90] Thermistor ASSY (R17142) Clamp 9 The wire harness of the thermistors is hooked under the electrical box.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 10 SiUS12-928_B Disconnect the connector for the overload protector [S40]. Points [S40] (R10539) 11 The wire harness for the compressor is attached to the partition plate (1) by the clamp. Clamp (R6422) 12 Pull out the clamp with pliers.
SiUS12-928_B Procedure Step 13 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Points Disconnect the relay connector of the compressor. (R6469) 14 Remove the screw on the stop valve mounting plate. Electrical box Stop valve mounting plate (R10395) 15 Remove the screw on the partition plate (1).
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 16 SiUS12-928_B Points Slide the electrical box leftward to unfasten the hook on the right side. Hook (R10401) 17 Remove the electrical box.
SiUS12-928_B 2.3 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Removal of PCBs Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1. Remove the main PCB. 1 Open the cover of the electrical box. Points Hook Unfasten the 4 hooks. The hooks are marked with . Hook (R14617) 2 (R6427) Remove the 3 screws. Main PCB (R10404) 3 Unfasten the 4 hooks. 4 Lift up the main PCB.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 5 SiUS12-928_B Disconnect the connectors. U Points V W [S51] [S101] [S10] [HR2] [AC2] [HR1] [AC1] Refer to page 33 for detail. [S51] [S101] : service monitor PCB [S10] : terminal board (transmission) [HR1] [HR2] : reactor [AC1] [AC2] : terminal board (power supply) [U] [V] [W] : compressor (R10407) 6 Remove the main PCB. (R10408) 2. Remove the reactor. 1 Remove the screw.
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 3. Remove the service monitor PCB. 1 Disconnect the connectors from the service monitor PCB [S52] [S102]. Points [S102] [S52] Service monitor PCB (R10410) 2 Slightly lift the top hook to unfasten it. (R6436) 3 Unfasten the bottom hook to remove the service monitor PCB.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU SiUS12-928_B Procedure Step Points 4. Remove the terminal board. 1 Remove the screw. Terminal board (R10411) 2 Unfasten the hook. (R10412) 3 Remove the terminal board.
SiUS12-928_B 2.4 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Removal of Fan Motor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step Points (R10414) 1 Remove the 2 lower screws of the fan motor. 2 Remove the 2 upper screws. Be sure to remove the lower screws first. If the upper screws are removed first, the fan motor may tilt or fall because the center of its gravity is toward the front. It may cause injuries.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU 2.5 SiUS12-928_B Removal of Coils / Thermistors Procedure Step 1. Remove the electronic expansion valve coil. 1 Pull the electronic expansion valve coils. Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Points Electronic expansion valve coil (R10415) (R17411) 2. Remove the thermistors. 1 Pull out the gas pipe thermistors.
SiUS12-928_B Procedure Step 2 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Points Peel the putty, and pull out the liquid pipe thermistors. Liquid pipe thermistor (R17413) Be careful not to lose the fixtures for the thermistors. Liquid pipe thermistor Fixture (R6450) 3 Pull out the outdoor heat exchanger thermistor.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 4 SiUS12-928_B Points Be careful not to lose the clip for the thermistor. Remove the clip from the outdoor heat exchanger thermistor. Clip (R6452) 5 Slightly open the sound blanket (outer). Sound blanket (outer) 6 (R10418) Remove the sound blanket (top upper).
SiUS12-928_B Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 7 Remove the discharge pipe thermistor. 8 Remove the fixture. Discharge pipe thermistor Points (R10420) Be careful not to lose the fixture for the thermistor. Fixture (R10430) 3. Remove the four-way valve coil. 1 Remove the screw.
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 2 SiUS12-928_B Points Remove the four-way valve coil.
SiUS12-928_B 2.6 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Removal of Sound Blankets Procedure Warning Procedure Step 1 Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Open the sound blanket (outer). Sound blanket (outer) 2 Points (R10433) The sound blanket is fragile. Carefully pass the discharge pipe through it. Remove the sound blanket (top upper).
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Procedure Step 4 SiUS12-928_B Points The sound blanket is fragile. Carefully pass the discharge pipe through it. Remove the sound blanket (outer). Sound blanket (outer) 5 The sound blanket is fragile. Carefully pass the discharge pipe through it. Remove the sound blanket (top inner). Sound blanket (top inner) 6 (R10436) (R10437) Open the sound blanket (inner) and pass it through the part of the mufflers. The sound blanket is fragile.
SiUS12-928_B Procedure Step 7 Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU Points Remove the sound blanket (inner).
Outdoor Unit: 3MXS24JVJU, 4MXS32GVJU 2.7 Removal of Compressor Procedure Warning Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work. Procedure Step 1 SiUS12-928_B Points Remove the terminal cover. Terminal cover (R6466) 2 3 Disconnect the compressor lead wires. Remove the overload protector. U : red, V : yellow, W : blue U(red) W(blue) V(yellow) Overload protector (R9471) 4 Disconnect the pipings, referring to page 221.
SiUS12-928_B Part 8 Trial Operation and Field Settings 1. 2. 3. 4. 5. Pump Down Operation............................................................................255 Forced Operation ....................................................................................256 Wiring Error Check Function ...................................................................257 Trial Operation ........................................................................................259 Field Settings ..............
Pump Down Operation SiUS12-928_B 1. Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing the unit. Detail 1) Remove the valve caps from the liquid stop valve and the gas stop valve. 2) Carry out forced cooling operation. 3) After 5 to 10 minutes, close the liquid stop valve with a hexagonal wrench. 4) After 2 to 3 minutes, close the gas stop valve and stop the forced cooling operation.
SiUS12-928_B Forced Operation 2. Forced Operation Outline Forced operation mode includes forced cooling and forced heating. Operation mode can be selected by the operation mode switch (SW2) on the outdoor unit. Press the forced operation [ON/ OFF] switch (SW1) on the outdoor unit to start the operation.
Wiring Error Check Function SiUS12-928_B 3. Wiring Error Check Function Outline The convenient wiring error check function is designed for the microcomputer to correct wiring errors itself. If local wiring is unclear in the case of buried piping, for example, just press the wiring error check switch that is behind the stop valve cover of the outdoor unit. Even if the connections for Room A and Room B are confused, the system may run without a hassle.
SiUS12-928_B Wiring Error Check Function Basic Knowledge Refrigerant flows from Port A and on. The temperatures of the indoor heat exchanger thermistors are detected one by one to check up the matching between the piping and wiring. With this function on, freezing (crackling) noise may be heard from the indoor unit. This is not a problem. (This is because the heat exchanger temperature is made to drop below 0°C in order to increase the detection accuracy.
Trial Operation SiUS12-928_B 4. Trial Operation Outline 1. Measure the power supply voltage and make sure that it falls in the specified range. 2. Trial operation should be carried out in either cooling or heating operation. 3. Carry out the trial operation in accordance with the operation manual to ensure that all functions and parts, such as louver movement, are working properly. The air conditioner requires a small amount of power in its standby mode.
SiUS12-928_B Trial Operation ARC433 Series (1) Press the [ON/OFF] button to turn on the system. (2) Press the center of the [TEMP] button and the [MODE] button at the same time. (3) Press the [MODE] button twice. (T appears on the display to indicate that trial operation is selected.) (4) Press the [MODE] button and select the operation mode. (5) Trial operation terminates in approx. 30 minutes and switches into normal mode. To quit a trial operation, press the [ON/OFF] button.
Field Settings SiUS12-928_B 5. Field Settings 5.1 Outdoor Unit 5.1.1 Priority Room Setting Outdoor electronic expansion valves are controlled to provide more capacity to the prioritized room. Setting method Turn off the circuit breaker before changing the setting. Only one room can be set as the priority room (By turning on one of the SW4 on the service monitor PCB of the outdoor unit). The control starts when all the following conditions are met. Priority room setting is made.
SiUS12-928_B Field Settings 5.1.2 COOL / HEAT Mode Lock Use the [S15] connector to set the unit to cooling only or heating only. Setting to heating only (H): Short-circuit pins 1 and 3 of the connector [S15]. Setting to cooling only (C): Short-circuit pins 3 and 5 of the connector [S15]. The following specifications apply to the connector housing and pins. JST products Housing: VHR-5N Pin: SVH-21T-1, 1 Note that forced operation is also possible in cooling / heating mode.
Field Settings SiUS12-928_B 5.1.3 NIGHT QUIET Mode If NIGHT QUIET mode is to be used, initial settings must be made when the unit is installed. Explain the function of NIGHT QUIET mode, as described below, to the customer, and confirm whether or not the customer wants to use NIGHT QUIET mode. NIGHT QUIET mode function reduces operating noise of the outdoor unit at nighttime. This function is useful if the customer is worried about the effects of the operating noise on the neighbors.
SiUS12-928_B 5.2 Field Settings Indoor Unit 5.2.1 Model Type Setting ARC452A21, ARC452A23 The remote controller is common to the heat pump model and cooling only model. Use the DIP switch on the remote controller to set the model type. Set the DIP switch as shown in the illustration. (The factory set is the heat pump side.) • Heat pump model: Set the DIP switch to H/P. • Cooling only model: Set the DIP switch to C/O. DIP switch H/P C/O (R12755) 5.2.
Field Settings SiUS12-928_B 5.2.3 When 2 Units are Installed in 1 Room Outline When 2 indoor units are installed in 1 room, 1 of the 2 indoor units and the corresponding wireless remote controller can be set for different address. Both the indoor unit PCB and the wireless remote controller need alteration. The method of address setting varies depending on the type of indoor unit and the series of wired remote controller.
SiUS12-928_B Wireless Remote Controller Field Settings (1) Remove the cover and take it off. (2) Cut the address setting jumper. ARC452 series ARC433 series Jumper Jumper ADDRESS EXIST 1 CUT 2 ADDRESS EXIST 1 CUT 2 (R6573) (R12065) 5.2.4 Jumper Settings Jumper (on indoor unit PCB) JB JC Function When connected When cut (factory set) Fan speed setting Fan speed setting ; Fan speed setting; “0” (The fan when compressor Remote controller stops.) stops for thermostat setting OFF.
Application of Silicon Grease to a Power Transistor and a Diode Bridge SiUS12-928_B 6. Application of Silicon Grease to a Power Transistor and a Diode Bridge Applicable Models All outdoor units using inverter type compressor for room air conditioner. When the printed circuit board (PCB) of an outdoor unit is replaced, it is required that silicon grease (1) is certainly applied to the heat radiation part (the contact point to the radiation fin) of the power transistor and diode bridge.
SiUS12-928_B Part 9 Appendix 1. Piping Diagrams......................................................................................269 1.1 Indoor Unit................................................................................................ 269 1.2 Outdoor Unit ............................................................................................. 271 2. Wiring Diagrams......................................................................................273 2.1 Indoor Unit...................
Piping Diagrams SiUS12-928_B 1. Piping Diagrams 1.1 Indoor Unit CTXS07JVJU, CTXS09/12HVJU FTXS15/18HVJU INDOOR UNIT INDOOR UNIT (5/16CuT) (5/16CuT) HEAT EXCHANGER HEAT EXCHANGER THERMISTOR ON HEAT EXCH. FIELD PIPING (1/4CuT) FIELD PIPING (3/8CuT) THERMISTOR ON HEAT EXCH.
SiUS12-928_B Piping Diagrams FDXS09/12DVJU FDXS09/12LVJU INDOOR UNIT INDOOR UNIT (1/4CuT) (1/4CuT) HEAT EXCHANGER HEAT EXCHANGER THERMISTOR ON HEAT EXCH. FIELD PIPING (1/4CuT) THERMISTOR ON HEAT EXCH. SIROCCO FAN FIELD PIPING (1/4CuT) M M FAN MOTOR FAN MOTOR FIELD PIPING (3/8CuT) SIROCCO FAN FIELD PIPING (3/8CuT) (3/8CuT) (3/8CuT) REFRIGERANT FLOW COOLING HEATING REFRIGERANT FLOW COOLING HEATING 4D051787 4D074621 CDXS15/18LVJU INDOOR UNIT (1/4 (6.
Piping Diagrams 1.
SiUS12-928_B Piping Diagrams 4MXS32GVJU OUTDOOR UNIT HEAT EXCHANGER OUTDOOR TEMPERATURE THERMISTOR RECEIVER HEADER 3/8CuT 3/8CuT HEAT EXCHANGER(CONDENSER) THERMISTOR 3/8CuT 1/2CuT HEADER 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT 5/16CuT DC FAN MOTOR MOTOR OPERATED LIQUID PIPE VALVE (A) THERMISTOR EVA (ROOM-A) 5/16CuT MOTOR OPERATED LIQUID PIPE FILTER VALVE (B) THERMISTOR EVB (ROOM-B) 5/16CuT ROOM A (1/4CuT) MOTOR OPERATED LIQUID PIPE FILTER VALVE (C) THERMISTOR (ROOM-C) EV
Wiring Diagrams SiUS12-928_B 2. Wiring Diagrams 2.1 Indoor Unit CTXS07JVJU, CTXS09/12HVJU FIELD WIRING. PCB3 S27 S26 PCB1 1 H1 ~ ~ RECTIFIER Fu 3.15A t° R1T S38 X1M BLK 1 H2 WHT RED GRN / YLW H3 TRANSMISSION CIRCUIT S21 OUTDOOR 3 CAUTION NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN.
SiUS12-928_B Wiring Diagrams CTXS07LVJU, FTXS09/12LVJU X1M PCB1 PCB2 H1 F1U 3.15A V1TR LED LED LED S1 1 H1P H2P H3P S26 1 ( ) SIGNAL 10 2 S32 1 1 RED 1 GRY YLW C1 M 1~ PPL indoor BLU R2T : C1 : F1U : GRN / YLW Q1M 130°C M1F PROTECTIVE GROUND CAPACITOR (M1F) FUSE outdoor FIELD WIRING. CAUTION NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN.
Wiring Diagrams SiUS12-928_B FDXS09/12DVJU X1M PCB1 PCB2 H1 F1U 3.15A V1TR LED LED LED S1 1 H1P H2P H3P S26 1 ( ) SIGNAL 10 2 S32 1 3 GRY YLW 3 C1 t° M 1~ PPL Q1M 130°C indoor BLU R2T WIRELESS REMOTE CONTROLLER M1F PROTECTIVE GROUND CAPACITOR (M1F) FUSE : C1 : F1U : 3 outdoor FIELD WIRING. GRN / YLW CAUTION NOTE THAT OPERATION WILL RESTART AUTOMATICALLY IF THE MAIN POWER SUPPLY IS TURNED OFF AND THEN BACK ON AGAIN.
SiUS12-928_B 2.2 Wiring Diagrams Outdoor Unit 2MXS18GVJU GRN YLW Z3C FU201 MID2 L1R HE ORG FIELD WIRING YLW ~ BLU V2 - CN11 1 H5PH4PH3PH2P H1P S2W S5W S1W : FERRITE CORE Z1C~Z3C : TERMINAL STRIP X1M~X3M : ELECTRONIC EXPANSION VALVE COIL Y1E~Y2E : VARISTOR V2~V5 FU1, FU2.
Wiring Diagrams SiUS12-928_B 4MXS32GVJU L1R Z6C Z1C YLW outdoor FIELD WIRING 277 Z1C~Z6C X1M~X5M Y1E~Y4E V2, V3, V5, V9, V100 SA2 FU1, FU2, FU3 AC1, AC2 U, V, W, X11A E1, E2 HR1, HR2 SW3 Y1R : FERRITE CORE : TERMINAL STRIP : ELECTRONIC EXPANSION VALVE COIL : VARISTOR : SURGE ARRESTER : FUSE MRM10, MRM20 MRC/W R1T~R3T R4T~R7T R8T~R11T S2~S102 LED1~LED5 LEDA : MAGNETIC RELAY : THERMISTOR : CONNECTOR : PILOT LAMP BLK BLK R3T R2T R1T 11 BLU Y4E t° YLW Y3E t° t° t° S93 1 GRY Y2E 10 BL
