Ductless Multi-Split Heat Pump Outdoor 2U18MS2VHB 3U24MS2VHB 4U36MS2VHB Service Manual Design may vary by model number. • Please read this manual before using the heat pump. • Keep this user manual for future reference.
Revision History Aug. 2020 - Manual release.
INTRODUCTION Safety & Precautions............................................................................................................................................................. A-2 Specifications........................................................................................................................................................................ A-3 Outdoor Units ...................................................................................................................
ENGLISH Safety & Precautions Topic Title • Read these Safety Precautions carefully to ensure correct installation. • This manual classifies the precautions by WARNING and CAUTION. • Follow all precautions below. They are all important for ensuring safety and preventing property/equipment damage. ! WARNING: Failure to follow any of WARNING is likely to result in grave consequences such as death or serious injury. ! CAUTION: Failure to follow any of CAUTION may, in some cases, result in grave consequences.
Specifications Topic Title Outdoor Units 2 Zones 3 Zones 4 Zones 2U18MS2VHB 3U24MS2VHB 4U36MS2VHB 17,400 22,600 34,000 4,400-19,400 5,000-24,500 5,000-36,000 ENGLISH Compressor Type: DC Inverter Driven Rotary Voltage/Cycle/Phase: 208-230/60/1 Operating Range (OF): Cooling Heating -22 -15 -4 0 5 14 75 115 Outdoor Units Rated Capacity Btu/hr Cooling Non- Capacity Range Btu/hr ducted Rated Power Input W SEER/EER Cooling Ducted 2,250 3,770 18.0/10.0 18.0/9.
Specifications Topic Title ENGLISH Highwall Indoor AW07LC2VH(-) AW09LC2VH(-) AW12LC2VH(-) AW18LC2VH(-) AW24LP2VH(-) 22,000 Rated Cooling Capacity Btu/hr 7,000 9,000 12,000 18,000 Rated Heating Capacity Btu/hr 8,000 10,000 13,000 19,000 24,000 208-230/60/1 208-230/60/1 208-230/60/1 208-230/60/1 208-230/60/1 Airflow CFM (Turbo/H/M/L/Quiet) 410/350/295/235/205 410/350/295/235/205 440/380/320/265/215 636/530/483/430/383 710/650/560/440/410 Indoor Sound dB (Turbo/H/M/L/Quiet) 43/38
Specifications Topic Title Cassette Indoor AB12SC2VH(-) AB18SC2VH(-) 9,000 12,000 18,000 24200 Rated Heating Capacity Btu/hr 10,000 13,000 19,000 27300 Voltage, Cycle, Phase V/Hz/- AL24LP2VH(-) 208-230/60/1 208-230/60/1 208-230/60/1 208-230/60/1 Airflow CFM (Turbo/H/M/L/Quiet) 410/365/305/265/205 410/365/305/265/205 470/410/365/295/252 740/630/480/400 Indoor Sound dB (Turbo/H/M/L/Quiet) 42/40/36/32/25 42/40/36/32/25 45/42/40/36/32 38/35/32/29 Grille Model ENGLISH AB09SC2VH(-) R
ENGLISH Functions and Control Auto Mode Dry Mode (Dehumidifying Mode) When the running mode is turned to auto after starting the system, the system will first determine the running mode according to the current room temperature and then will run according to the determined mode: Tr means room temperature; Ts means temperature setting; Tp means temperature of indoor coil pipe • Temperature control range: 60-86°F Tr≥73°F Choose Cooling Mode Tr<73°F Choose Heating Mode After turning to the au
Functions and Control Heat Mode • Temperature control range: 60-86°F • Temperature difference: ±2°F Control feature: the temperature compensation is automatically added and the system will send the heating signals to the outdoor system. If Tr≤Ts, the outdoor compressor is turned on, the indoor fan will be at the cold air proof mode. If Tr>Ts+, the outdoor system is turned off, the indoor fan will be at the heat residue sending mode.
Functions and Control ENGLISH Abnormality Confirmation Approaches 1. Indoor temperature sensor abnormality: Under the operation, the normal temperature ranges from 120°F to -30°F. When the temperature goes beyond this range, the abnormality can be confirmed. If the temperature goes back into the range, the system will automatically resume. 2. Indoor heat interaction sensor abnormality: Under the operation, the normal temperature ranges from 120°F to -30°F.
Functions and Control Over-Temperature Heat Mode Indoor Coil Should this routine be initiated, the system will reduce compressor frequency until the indoor coil temperature reaches 117F. Once this is achieved, the system will return to normal operation. 149°F 138°F 131°F 124°F 117°F INTRODUCTION A-9 ENGLISH The over-temperature routine will protect the system from excessive high indoor coil temperature during heat mode operation.
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OUTDOOR TECHNICAL OVERVIEW ENGLISH 2U18MS2VHB 3U24MS2VHB 4U36MS2VHB Table of Contents Components.......................................................................................................................................................................... B-2 Service Monitor Board (SMB)............................................................................................................................................... B-2 Module Circuit Board (MCB)......................................
ENGLISH Components Topic Title The outdoor unit features a variable speed rotary type compressor that delivers refrigerant flow to up to 4 individual indoor units. The system uses R-410A refrigerant mixed with PVE oil. The system is rated to operate at 208/230 volts single phase 60 Hz power. Indoor units compatible with this model include high wall type, slim duct type and cassette type. The indoor cassette unit can be controlled by either a remote control or a wired controller.
Components Topic Title Electronic Control Unit Circuit Board (ECU) The Electronic Control Unit operates the outdoor fan motor, crankcase heater, EEV stepper motors and the 4-way valve. This board also controls the general operation of the system and makes all of the diagnostic decisions. The ECU is connected via communication cables to the Module Circuit Board, Power Circuit Board and the Service Monitor Board.
Components ENGLISH Power Circuit Board (PCB) The purpose of the Power Circuit Board is to filter out potential electrical noise before it reaches the outdoor unit electronic circuits. All voltage to operate the outdoor unit circuits must pass through the PCB. 1. A replaceable 25A 250V rated ceramic fuse protects the outdoor unit electronics. The fuse would open if a power surge or internal short in the outdoor unit occurred. This fuse is field replaceable. 2.
Components Outdoor Fan Motor 4 Way Valve ENGLISH The Outdoor Fan Motor is a variable speed motor. The motor is energized via a connection plug on the ECU. The motor is powered by line voltage from the ECU. The motor has a PWM circuit that feeds back voltage to the ECU. The ECU will control the speed of the motor by a DC voltage applied to the yellow wire of the connection plug. The feedback PWM signal from the fan motor is applied to the ECU via the blue wire on the connection plug.
Components ENGLISH Compressor example, in cooling mode, at outdoor air temperature above 68°F, the starting position of the valve will be 250 pulses. If the Outdoor Air Temperature is lower than 68°F, the valve will be opened to a position equal to 210 pulses. The actual starting position of the valve is not something a service technician can use to aid in solving a diagnostic problem. It is however, good to understand how these systems fundamentally work.
Components Temperature Sensors The second group of sensors monitor key temperatures in the refrigeration circuit and outdoor unit. The sensors associated with the refrigeration circuit include compressor discharge line temperature, compressor suction line temperature, outdoor coil entering gas temperature, outdoor coil temperature cooling mode and outdoor coil heat mode temperature (Defrost). The ambient outdoor air temperature is monitored by sensor Ta.
ENGLISH Operations The outdoor unit is capable of controlling up to 4 individual indoor units. The outdoor unit will vary compressor capacity and outdoor fan motor speed to match the demand requirement from the indoor units. All capacity and diagnostic decisions are controlled by the outdoor unit ECU. During any period where the outdoor unit is running, all indoor units must be in the same mode of operation.
Operations The temperature of the compressor discharge hot gas will be monitored by the Discharge Temperature Sensor. If the sensor reads too hot or cool, the frequency/status of the operation will potentially be altered. The hot gas will leave the oil separator and enter the 4 way valve. The 4 way valve will direct the hot gas to the outdoor coil. The refrigerant will condense in the outdoor coil and be slightly subcooled. The refrigerant is now in a liquid state.
Operations ENGLISH Heating Mode Sequence of Operation 6 4-way valve coil: Refrigerant flow in cooling OFF ON Refrigerant flow in heating Compressor Discharge temp. sensor 1 Oil separator 2 Indoor unit A 2 Unit B gas pipe temp. sensor Indoor unit B Accumulator Capillary tube φ2.7*φ1.0*55in Unit A gas pipe temp. sensor Indoor heat exchanger temp. sensor High pressure switch Gas stop valve Pipe sensor Toci 4-way valve Unit C gas pipe temp.
Operations 4 Temperature Sensor Te The temperature of the compressor discharge hot gas will be monitored by the Discharge Temperature Sensor. If the sensor reads too hot or cool, the frequency/status of the operation will potentially be altered. The hot gas will leave the oil separator and enter the 4 way valve. The 4 way valve will direct the hot gas to ALL of the indoor coils. Note: Any indoor unit that is in heating mode will have it’s louver open and indoor fan running.
ENGLISH Operations Outdoor Frequency Control Crankcase Heater Control A. The compressor running frequency is range is 20-95 RPS. The crankcase heater is controlled by the ECU. The heater keeps the compressor oil warm to prevent liquid refrigerant from migrating to the oil during periods where the system is not running. The heater will operate during off cycle periods when the outdoor air temperature is below 80.6°F. When the outdoor air temperature is greater than 90°F, the heater will not be energized.
Operations Initiating Forced Defrost Operation A forced defrost cycle can be initiated with the compressor off. The system will enter a 3 minute time delay prior to energizing the compressor. Defrosting Time Flowchart 10.2.7 Defrosting operation flow chart: beginning indicated FQY 60s defrosting FQY 80 Hz（E ） 60s soft startup compressor 0HZ 0HZ 5s outdoor motor ON send defrosting signal to indoor Auto OFF ON OFF Reduce FQY rapidly 2HZ/S 0.93I Reduce FQY rapidly 1HZ/S 0.
Operations There are times when the switch is not active. The periods of inactive switch operation are: 1. When the compressor starts up the switch will be off for 8 minutes. 2. When the system is defrosting the switch is not active. During compressor start-up, if the AC current is greater than 9A, the frequency of the compressor increases at the prohibited speed. During compressor start-up, if the AC current is greater than 8A, the frequency of the compressor increases at the speed of no faster than 0.
Topic Testing Title Outdoor Fan Motor 1 If the outdoor unit fan motor does not run, or the Service Monitor Board indicates an error code of 09, check the following voltages at the motor connector on the outdoor unit PCB. Set the meter to read DC volts with a minimum voltage range of 350 volts. All voltage values are approximate. Initiate forced cooling. 1. DC voltage between the Red and Black wire connnections should read 310 ~ 334 VDC. This is the main voltage for powering the fan motor.
Topic Testing Title ENGLISH 4-Way Valve The 4-way valve will control the direction of hot gas discharge via an internal slide assembly. The valve has a line voltage solenoid that is energized in heat mode. The solenoid will direct the internal slide to send the hot gas to the indoor coil. During cooling mode de-energized operation, the internal slide will direct compressor hot gas to the outdoor coil.
Testing Variable Speed Compressor 2. Locate the Inverter control module (IPM). The IPM is connected to the main circuit board by a wire harnesses, and has the compressor connections mounted on it. 3. Set your test meter to AC volts and test for voltage at the three compressor connections. Voltage should be zero before proceeding. 4. Remove the three compressor connections making note of the terminal letter and the wire colors. 5. Set your ohm meter to the lowest resistance setting that is available.
Wiring Diagrams ENGLISH 2U18MS2VHB B-18 OUTDOOR TECHNICAL OVERVIEW
Wiring Diagrams 3U24MS2VHB ENGLISH OUTDOOR TECHNICAL OVERVIEW B-19
Wiring Diagrams ENGLISH 4U36MS2VHB B-20 OUTDOOR TECHNICAL OVERVIEW
DIP Switch Settings SW5 DIP Switch Settings (3U24MS2VHB, 4U36MS2VHB) Cooling Only SW5-1 SW5-2 SW5-3 SW5-4 SW5-5 SW5-6 SW5-7 SW5-8 ON ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- Heat Pump OFF* Set On For Colder Climates ---- ON ---- ---- ---- ---- ---- ---- Set Off For Normal Operations ---- OFF* ---- ---- ---- ---- ---- ---- Max Running Current Is 15Amps ---- ---- ON ---- ---- ---- ---- ---- Normal Conditions ---- ---- OFF* --
DIP Switch Settings ENGLISH SW6 DIP Switch Settings Outdoor central control address settings Outdoor Central Control Address SW6-1 SW6-2 SW6-3 SW6-4 Master Indoor Unit Slave 1 Slave 2 Slave 3 Slave 4 Slave 5 Slave 6 Slave 7 Slave 8 Slave 9 Slave 10 Slave 11 Slave 12 Slave 13 Slave 14 Slave 15 OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF OFF ON ON OFF OFF ON ON OFF OFF ON ON OFF OFF ON ON OFF OFF OFF OFF ON ON ON ON OFF OFF OFF OFF ON ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON
Error Codes ENGLISH LED Error Diagnosis Code 1 Outdoor EEPROM failure 2 IPM overcurrent or short circuit 4 Communication failure between the IPM and outdoor PCB 5 Module operated overload (compressor overload protection) 6 Module low or high voltage 8 Overheat protection for discharge temperature 9 Malfunction of the DC fan motor 10 Malfunction of defrost temperature sensor 11 Suction temperature sensor failure Precautions For Adding Refrigerant 12 Ambient temperature sensor failure 1.
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WALL MOUNT TECHNICAL OVERVIEW ENGLISH AW07LC2VHB AW09LC2VHB AW12LC2VHB AW18LC2VHB AW24LP2VHA Table of Contents Components.......................................................................................................................................................................... C-2 Component Overview.......................................................................................................................................................... C-2 Indoor Wall Mount Unit Circuit Board.
ENGLISH Components The wall mounted units act as evaporator coils during cooling mode and condenser coils during heating mode. These units have gravity condensate drain systems. If a condensate pump is needed, it must be field provided and mounted external to the indoor unit. Component Overview 5 The wall mount unit is shipped with a wireless controller. 4 8 7 6 1 2 3 3 1 Terminal Block 3 Power to operate the indoor unit comes from the electrical line voltage terminal block at the outdoor unit.
Components 6 Display 7 Control Board The indoor unit circuit board controls the switching functions of the indoor unit. All control decisions are made by the outdoor unit ECU. The indoor board has some limited diagnostic capability which will be covered in this manual.
ENGLISH Components Topic Title Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2. Power connects from these terminal connections on the circuit board. If the board does not respond to commands and has no display, check for line voltage at these connections. When power is present at the indoor board, the RED LED on the circuit board will blink a 2 flash code. The control board has a replaceable 3.15A 250V fuse that protects against excessive current.
Testing Accessing Components/Removing Cover 2. Lift the front cover by prying on the two indented finger holds at each end of the indoor unit. 6. Open the 3 caps that cover the screws located behind the bottom of the louver. These caps flip up. 7. Remove the three screws located behind the caps. 3. Remove the three Phillips head screws located near the bottom of the indoor unit. These screws are located directly below the bottom of the air filter. 8.
Testing ENGLISH Indoor Fan Motor Voltage Check Red +310 VDC Black If The Indoor Fan Motor Does Not Run: 1. Remove the front cover and access the circuit board fan motor connection. DC Motor +15 VDC Yellow Signal Blue 2. Reset power and turn the remote control fan command to Fan On mode. Feedback 2 1 Motor Test: DC Ground White 1. If the motor doesn’t run, check for 310VDC between Pins 1 and 3. If it is not present, the indoor board is bad. If voltage is present, continue on. 2.
Testing 9. Unplug the motor from the circuit board. 7. Lift the evaporator coil and remove the motor bracket. 10. Lift and slide the motor away from the blower wheel. 8. Loosen the motor shaft set screw. Phillips head screw. 11. Remove the two black anti vibration mounts from the defective motor and place them on the new motor. ENGLISH 6. Remove 6 screws that hold the motor bracket and evaporator coil. 12. Install new motor in reverse order.
Testing ENGLISH Testing Temperature Sensors The easiest problems to solve will involve codes that are related to potential failure of temperature sensors. Common problems may include loose connections, open electrically, and out of calibration. Checking the condition of the sensors requires a temperature probe and an ohmmeter. 3. Identify on the schematic drawing the inoperable louver motor and disconnect the plug from the circuit board.
Wiring Topic Diagrams Title ENGLISH WALL MOUNT TECHNICAL OVERVIEW C-9
ENGLISH Error Codes The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ.
COMPACT CASSETTE TECHNICAL OVERVIEW ENGLISH AB09SC2VHA AB12SC2VHA AB18SC2VHA Table of Contents Components.......................................................................................................................................................................... D-2 Component Overview..........................................................................................................................................................D-2 Cassette Unit Indoor Circuit Board....................
ENGLISH Components The indoor cassette type units act as evaporator coils during cooling mode and condenser coils during heating mode. These units have a built in condensate pump with an associated condensate level switch. The condensate pump is capable of lifting water out of the indoor unit. If high water lift is needed, the water from the cassette pump should be pumped into a field supplied condensate pump with high lift power.
Components Topic Title 4 The Blower Assembly The indoor blower motor is a Multi Speed Fan Motor that is connected to the indoor unit control board. The wiring from the motor to indoor board consists of 4 wires connected to pins common, low , medium and high speeds. During normal operation, the indoor control board will energize the indoor blower motor and request proper speed. The motor has a run capacitor that is located in the Cassette unit’s control box.
Components Topic Title ENGLISH Cassette Unit Indoor Circuit Board 8 7 6 15 11 5 3 12 4 2 13 14 1 9 10 1 N Terminal 6 CN19 Float Switch 11 CN6 Fan Motor 2 L Terminal 7 CN21 Louver Panel 12 CN9 Condensate Pump 3 Communication Terminal 8 CN11 Wired Remote 13 CN4 U-HOME 4 3.15A 250V Fuse 9 DIP Switches 14 CN13 Remote Central 5 CN3 Pipe/Room Temp Sensors 10 CN35 Stepper Motor 15 CN1 Room Card The indoor unit circuit board controls the switching functions of the indoor unit.
Testing Removing Fan Motor 1. Disconnect power to the outdoor unit. 1. Remove holding nut from fan blade. ENGLISH Accessing the Blower Motor and Condensate Pump 2. Remove the louver assembly. 2. Fan blade will slide off motor shaft. 3. Remove Phillips head screw holding cover plate over motor wiring leads. 3. Disconnect the main power wire to the indoor unit. 4. Remove 3 nuts that hold fan motor in place. 4. Unplug the condensate pump and float switch from wiring harness. 5.
Testing ENGLISH Indoor Fan Motor Test Procedure If the indoor fan motor does not run: 1. Disconnect power to the system. 2. Remove the return air cover and access the circuit board connection. 3. Reset power and turn the remote control fan command to Fan On mode. Motor Test: 1. If the motor doesn’t run, check for 310VDC between Pins 1 and 3. If it is not present, the indoor board is bad. If voltage is present, continue on. Red Black 2. Check the voltage between Pins 3 and 4. The voltage should be +15VDC.
Testing Testing Louver Motors 4. Use an Ohmmeter to test the electrical continuity of the louver motor windings. The proper resistance for each winding can be found in this table. If the motor winding resistance is erratic or shows open, the motor is defective. Replace the motor. 1. Remove power from the unit and remove the indoor unit cover. 2. Access the circuit board. 5. If the motor checks out good, replace the indoor control board. 3.
Testing ENGLISH Test Condensate Pump and Associated Float Switch If the internal condensate pump does not operate, the pump may be bad or the float switch may be defective. Perform the following test: 1. Access the electrical control box. 2. Unplug the float switch from the circuit board. 3. The pump should start. 4. If the pump does not start, check for voltage at the pump connector on the board. There should be 230 Volts AC to the pump. If there is not, the circuit board is defective.
2014.11.29 Wiring Diagram & DIP Switch Settings PANNEL ENGLISH 0150515406 FLOAT SWITCH PIPING TEMP. ROOMCARD SENSOR DC FAN ROOM TEMP.
ENGLISH Error Codes The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ.
LARGE CASSETTE TECHNICAL OVERVIEW ENGLISH AL24LP2VHA Table of Contents Components...........................................................................................................................................................................E-2 Component Overview...........................................................................................................................................................E-2 Cassette Unit Indoor Circuit Board...........................................
ENGLISH Components The indoor cassette type units act as evaporator coils during cooling mode and condenser coils during heating mode. These units have a built in condensate pump with an associated condensate level switch. The condensate pump is capable of lifting water out of the indoor unit. If high water lift is needed, the water from the cassette pump should be pumped into a field supplied condensate pump with high lift power.
Components 4 The Blower Assembly The indoor blower motor is a Multi Speed Fan Motor that is connected to the indoor unit control board. The wiring from the motor to indoor board consists of 4 wires connected to pins common, low , medium and high speeds. During normal operation, the indoor control board will energize the indoor blower motor and request proper speed. The motor has a run capacitor that is located in the Cassette unit’s control box.
Components ENGLISH Cassette Unit Indoor Circuit Board 9 5 2 10 4 7 6 3 11 1 8 1 Power 5 CN19 Float Switch 9 CN6 Fan Motor 2 Communication Terminal 6 CN11 Wired Remote 10 CN9 Condensate Pump 3 3.15A 250V Fuse 7 DIP Switches 11 CN14 Panel Connection 4 CN3 Pipe/Room Temp Sensors 8 CN36 Stepper Motor The indoor unit circuit board controls the switching functions of the indoor unit. All control decisions are made by the outdoor unit ECU.
Testing Removing Fan Motor 1. Disconnect power to the outdoor unit. 1. Remove holding nut from fan blade. ENGLISH Accessing the Blower Motor and Condensate Pump 2. Remove the louver assembly. 3. Disconnect the main power wire to the indoor unit. 2. Fan blade will slide off motor shaft. 4. Unplug the condensate pump and float switch from wiring harness. 3. Remove Phillips head screw holding cover plate over motor wiring leads. 5. Unplug fan motor from wiring harness. 4.
Testing ENGLISH Indoor Fan Motor Test Procedure If the indoor fan motor does not run: 1. Disconnect power to the system. 2. Remove the return air cover and access the circuit board fan motor connection. 3. Reset power and turn the remote control fan command to Fan On mode. Motor Test: 1. If the motor doesn’t run, check for 310VDC between Pins 1 and 3. If it is not present, the indoor board is bad. If voltage is present, continue on. Red 2. Check the voltage between Pins 3 and 4.
Testing Testing Louver Motors 4. Use an Ohmmeter to test the electrical continuity of the louver motor windings. The proper resistance for each winding can be found in this table. If the motor winding resistance is erratic or shows open, the motor is defective. Replace the motor. 1. Remove power from the unit and remove the indoor unit cover. 2. Access the circuit board. 0150516956U DC FAN MOTOR AB C . ROOM TEMP. SENSOR M M PIPING TEMP .
Testing ENGLISH Test Condensate Pump and Float Switch If the internal condensate pump does not operate, the pump may be bad or the float switch may be defective. Perform the following test: 1. Access the electrical control box. 2. Unplug the float switch from the circuit board. 3. The pump should start. 4. If the pump does not start, check for voltage at the pump connector on the board. There should be 230 Volts AC to the pump. If there is not, the circuit board is defective.
Wiring Diagram AB C . ROOM TEMP. SENSOR M M PIPING TEMP . FLOAT SWITCH SENSOR CN10 WIRED CONTROLLER CN19 CN1 A BC CN3 CN26 AB OFF ON 87654321 SW3(BM3) OFF ON 87654321 SW1(BM1) CN14 CN15 FUSE T5A 250VAC CN4 CN3 .
DIP Switch Topic Title Settings ENGLISH BM1 DIP Switch Settings Description Capacity Room Card Running Mode Unit Type SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 SW1-7 SW1-8 Capacity: 24kBTU(7.1kW) ON ON OFF --- --- --- --- --- Capacity: 30kBTU(9.0kW) OFF OFF ON --- --- --- --- --- Capacity: 35kBTU(10.5kW) ON OFF ON --- --- --- --- --- Capacity: 42kBTU(12.5kW) OFF ON ON --- --- --- --- --- Capacity: 48kBTU(14.
Error TopicCodes Title Indoor LED4 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 6 6 6 6 6 6 0 0 0 0 0 0 0 0 Indoor Panel Outdoor Diagnosis LED1 Display LED 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 1 2 4 7 8 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 01 02 04 07 08 0C 0D 0E 1 2 / 4 5 6 / 8 9 10 11 12 13 / 15 16 17 18 / 20 21
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SLIM DUCT TECHNICAL OVERVIEW ENGLISH AD07SL2VHB AD09SL2VHB AD12SL2VHB AD18SL2VHB Table of Contents Components...........................................................................................................................................................................F-2 Component Overview...........................................................................................................................................................F-2 Indoor Unit Circuit Board........................
ENGLISH Components The Slim Duct Indoor Unit will act as evaporator coils during cooling mode and condenser coils during heating mode. This unit can operate with a motorized supply air louver or it can have a LIMITED amount of ducting added to the unit’s return and supply air duct connection flanges. The return air ducting can be connected to the end of the cabinet or the bottom blank off plate can be removed for bottom return configuration.
Components 6 Piping Temperature Sensor 7 Condensate Pump The Slim Duct unit has a built in condensate pump. The pump is connected to the circuit board. The pump is energized whenever the Float Switch indicates that water needs to be pumped from the cassette. The float switch connects onto the circuit board. The float switch and pump are located behind the removable insulated cover next to the electrical control box. The pump is hermetically sealed and requires no maintenance.
3wire 1 4AWG Control Wiring Power Wiring Outdoor unit 1(N) 2 (L) 3 (C) Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2. Power connects from these terminal connections to CH- 1 and CH-2 on the circuit board. If the board does not respond to commands and has no display, check for line voltage at these connections. When power is present at the indoor board, the wired controller will be energized.
Ductwork Topic Title / Grilles Basic Duct Configurations ENGLISH Here are the typical duct configurations that can be used with the unit.
ENGLISH Topic Testing Title Test Condensate Pump and Float Switch 3. The pump should start. The unit has a built-in condensate pump and water level safety switch. There are also two optional ports for gravity drainage. The condensate pump is rated to lift water up to 27 9/16” from the point of discharge. 4. If the pump does not start, check for voltage at the control board pump connection. There should be 230 Volts AC to the pump. If there is not, the circuit board is defective.
Topic Testing Title Testing Temperature Sensors Indoor Fan Motor Voltage Check The Reference Section of this manual contains temperature resistance tables that can be used to check the calibration of the sensors. The measured resistance must be within the tolerances printed on the top of the tables. 1. Confirm the sensor is firmly attached to the circuit board connection plug. 2. Remove the sensor wires from the connection plug by releasing holding tension on the plugs tension tab.
ENGLISH Wiring Diagrams Topic & DIP Title Switch Settings ROOM TEMP. SENSOR PIPING TEMP. SENSOR FLOAT SWITCH 0150515412 REMOTE CENTRAL U-HOME PANNEL CONTROLLER ROOMCARD NOTE: 1.DASHED PARTS ARE OPTIONAL. 2.USER SHOULD NOT TO SET SW1 AND SW2 WITHOUT GUIDANCE. 3.THE BRIDGE (CN22 CN23) ON SLAVE UNITS PCB SHOULD BE CUT OFF WHEN ONE WIRED CONTROLLER CONTROL MORE THAN ONE UNIT.
Error TopicCodes Title Indoor LED4 Indoor LED3 Outdoor LED 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 6 6 6 6 6 6 0 0 0 0 0 0 0 0 0 0 0 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 1 2 4 7 8 17 18 19 12 13 14 15 1 2 / 4 5 6 / 8 9 10 11 12 13 / 15 16 17 18 / 20 21 / 23 24 25 26 27 28 29 30 31 32 33 34 35 36 / 38 39 40 41 42 43 44 45 / / / / / / / / / / / / Diagnosis Outdoor EEPROM failure IPM overcurrent or short circuit
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MID-STATIC DUCTED TECHNICAL OVERVIEW ENGLISH USYM09UCDSA USYM12UCDSA USYM18UCDSA USYM24UCDSA Table of Contents Components.......................................................................................................................................................................... G-2 Component Overview..........................................................................................................................................................G-2 Indoor Unit Circuit Board.............
ENGLISH Components The Mid-Static Ducted Indoor Unit will act as evaporator coils during cooling mode and condenser coils during heating mode. This unit can operate with a motorized supply air louver or it can have a LIMITED amount of ducting added to the unit’s return and supply air duct connection flanges. The return air ducting can be connected to the end of the cabinet or the bottom blank off plate can be removed for bottom return configuration.
Components 4 Control Board 5 Ambient Temperature Sensor The Ambient Temperature Sensor senses room temperature. This sensor provides room temperature information to the ECU for calculation of inverter capacity and temperature control. 6 Piping Temperature Sensor The Piping Temperature Sensor senses indoor coil temperature in the cooling mode and in the heating mode. This sensor is used for Anti Freezing and Anti Cold Blow cycles.
Components ENGLISH Indoor Unit Circuit Board The indoor unit circuit board controls the switching functions of the indoor unit. All control decisions are made by the outdoor unit ECU. The indoor board has some limited diagnostic capability which will be covered in this manual. 1 CN17-GEA3 wifi module socket 2 CN6-DC fan motor socket 3 CN10-Fresh air link/E.A.
Components Topic Title Fresh Air Function In Heating mode When a call for Fresh Air is received, via the wireless or wired controller, the unit will enable the standard fresh air function. This cycle will be active until one of the following occurs: This function can be activated at any mode except defrost mode. When the IDU been turned off by controller, the fresh air function is invalid. This function can be activated in any mode, except for defrost mode.
Ductwork / Grilles ENGLISH Basic Duct Configurations Here are the typical duct configurations that can be used with the unit.
Testing Testing Temperature Sensors If the internal condensate pump does not operate, the pump may be bad or the float switch may be defective. Perform the following test: The easiest problems to solve will involve codes that are related to potential failure of temperature sensors. Common problems may include loose connections, open electrically, and out of calibration. Checking the condition of the sensors requires a temperature probe and an ohmmeter. 1. Access the electrical control box. 2.
Testing ENGLISH Testing Communication Circuit If an Error E7 occurs, perform the following test to determine if the indoor control board is functioning properly to send data to the outdoor unit. Perform this test with the unit powered and all wiring connected between indoor and outdoor unit. Make sure all wiring between the indoor and outdoor unit are correct. There should no splices between the indoor and outdoor unit wiring connecting terminals 1 or 3.
NGLISH ENGLISH Testing Static Pressure Charts ENGLISH AM09SL2VHA air flow and static pressure chart 555 USYM09UCDSA AM09SL2VHA air flow and static pressure chart 555505 Air flow cfm Air flow cfm 505455 455405 High(cfm) Med(cfm) High(cfm) Low(cfm) Med(cfm) Quiet(cfm) Low(cfm) 405355 355305 305255 Quiet(cfm) 255205 0.1 205 0.15 0.1 0.2 0.15 0.28 0.2 0.36 0.4 0.44 0.48 Static pressure (in.wc.) 0.36 0.4 0.44 0.28 0.52 0.48 0.6 0.52 0.6 Static pressure (in.wc.
Topic Testing Title ENGLISH Board Replacement 3. Remove the 4 screws holding the pump in place. 1. Remove the ambient sensor. 2. Unplug all connectors from the board. 4. Tilt the pump out from the top and pull out 3. Remove the 2 board mounting screws and remove the board. 5. Pull wires through rubber grommets and remove pump assembly Removing the Condensate Pump Removing Fan Motor 1. Remove the air inlet cover. 1. Remove control board cover. 2. Unplug motor wires. 2.
Topic Testing Title 3. Feed motor wires into the air inlet box 9. Using a long 4mm hex wrench, loosen the set screws from the blower wheel and remove from motor shaft. 5. Remove the corner bracket. Replacing WiFi Module 1. Unplug existing WiFi module. 6. Remove the ground screw and free the motor wire harness. 2. Insert new WiFi module. 3. Replace the wifi passcode sticker. 7. Remove the screws holding the blower housing to the unit, 4 on each housing. 4. Pair the unit to account.
Wiring TopicDiagram Title DC FAN MOTOR M W CN6 LED3 ON ON P1 SW03 YL BLK BLK M YL BLU AC PUMP MOTOR CN16 CN19 CN20 FRELAY FOR FRESH AIR MOTOR(dry Contact ,rating-230VAC,3A) /E.A.
DIP Switch Settings SW1 DIP Switch Settings Capacity: 9000btu/h Capacity: 12000btu/h Capacity: 18000btu/h Capacity: 24000btu/h Room card invalid Room card valid Heat pump Cooling only Fresh air valid External alarm output Without filter clean warning With filter clean warning North America area Non-North America area ENGLISH Description SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 SW1-7 SW1-8 OFF ON OFF ON --------------------- OFF OFF ON ON --------------------- OFF OFF OFF OFF --------------------- --------
ENGLISH Error Codes The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ.
MEDIUM STATIC DUCTED (PRO SERIES) TECHNICAL OVERVIEW ENGLISH AM24LP2VHA Table of Contents Components.......................................................................................................................................................................... H-2 Component Overview..........................................................................................................................................................H-2 Indoor Unit Circuit Board..................................
ENGLISH Components The Medium Static Ducted Indoor Unit will act as evaporator coils during cooling mode and condenser coils during heating mode. This unit can operate with a motorized supply air louver or it can have a LIMITED amount of ducting added to the unit’s return and supply air duct connection flanges. The return air ducting can be connected to the end of the cabinet or the bottom blank off plate can be removed for bottom return configuration.
Components 6 Piping Temperature Sensor 7 Condensate Pump The Medium Static Ducted unit has a built in condensate pump. The pump is connected to the circuit board. The pump is energized whenever the Float Switch indicates that water needs to be pumped from the cassette. The float switch connects onto the circuit board. The float switch and pump are located behind the removable insulated cover next to the electrical control box. The pump is hermetically sealed and requires no maintenance.
3wire 1 4AWG Control Wiring Power Wiring Outdoor unit 1(N) 2 (L) 3 (C) Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2. Power connects from these terminal connections to CH- 1 and CH-2 on the circuit board. If the board does not respond to commands and has no display, check for line voltage at these connections. When power is present at the indoor board, the wired controller will be energized.
Ductwork Topic Title / Grilles Basic Duct Configurations ENGLISH Here are the typical duct configurations that can be used with the unit.
ENGLISH Topic Testing Title Test Condensate Pump and Float Switch 3. The pump should start. The unit has a built-in condensate pump and water level safety switch. There are also two optional ports for gravity drainage. The condensate pump is rated to lift water up to 27 9/16” from the point of discharge. 4. IIf the pump does not start, check for voltage at the pump control board connection. There should be 230 Volts AC to the pump. If there is not, the circuit board is defective.
Topic Testing Title Testing Temperature Sensors The Reference Section of this manual contains temperature resistance tables that can be used to check the calibration of the sensors. The measured resistance must be within the tolerances printed on the top of the tables. 1. Confirm the sensor is firmly attached to the circuit board connection plug. 2. Remove the sensor wires from the connection plug by releasing holding tension on the plugs tension tab. If The Indoor Fan Motor Does Not Run: 1.
ENGLISH Wiring TopicDiagram Title H8 MEDIUM STATIC DUCTED (PRO SERIES) TECHNICAL OVERVIEW
DIP Switch Settings SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 SW1-7 SW1-8 AM24LP2VHA ON ON OFF --- --- --- --- --- Room card invalid(default) --- --- --- OFF --- --- --- --- Room card valid --- --- --- ON --- --- --- --- Cool and heat(default) --- --- --- --- OFF --- --- --- Cool only --- --- --- --- ON --- --- --- External alarm output(default) --- --- --- --- --- OFF --- --- Fresh air --- --- --- --- --- ON --- --- Without filter clean remin
ENGLISH Error Codes The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ.
CONSOLE TECHNICAL OVERVIEW ENGLISH USYF09UCDWA USYF12UCDWA USYF18UCDWA Table of Contents Components............................................................................................................................................................................I-2 Component Overview............................................................................................................................................................I-2 Indoor Circuit Board.....................................
ENGLISH Components The indoor console unit functions as an evaporator coil during cooling mode, and as a condensing coil during heat mode. Condensate is collected by a drain pan below the coil and condensate is drained directly to the outdoor or to a secondary condensate pump via the provided condensate drain line Console units may be operated with either a wired remote control or the wireless remote control provided with the unit.
Components Indoor Circuit Board 2 3 ENGLISH 5 1 9 8 10 7 6 5 4 1 SW2-Damper switch 7 CN31- Display 2 CN35- Lower damper motor 8 CN3-Temperature sensor socket (Tr: ROOM SENSOR, Tp:PIPE SENSOR) 3 CN6-DC fan motor 4 9 CN17-WiFi module Power supply 5 10 RJ45 adapter board CN20-Diagnostic port 6 CN22- Optional wired controller The indoor unit circuit board controls the switching functions of the indoor unit. All control decisions are made by the outdoor unit ECU.
Topic Testing Title ENGLISH Removing the Filter Cover & Filter 1. Slide the side latches up to unlock the cover and pull forward about an inch then lift up. 3. Unplug the three connectors for the fan motor, upper louver and bottom damper. 4. Remove the ground screw. 2. The filter is very flexible and can be grabbed at any location and removed. Front Cover Removal 1. Remove the 4 screws that are at the corners of the air intake opening. Gently open the horizontal louver.
Topic Testing Title 4. Remove the 2 screws mounting the board in the box. They in diagonal corners from each other. Replace Fan Motor 1. Remove filter cover, front panel, control box, upper louver and bottom damper. 2. Remove the white plastic strap that hold the line set in place on the right side of the unit. Upper Louver Removal 1. Remove the filter cover and front cover. 2. Locate and remove the two screws mounting the upper louver assembly to the case. They are on either end of the assembly.
Topic Testing Title 5. Remove the four screws holding on the fan inlet faring. Indoor Fan Motor Test Procedure ENGLISH If the indoor fan motor does not run: 1. Disconnect power to the system. 2. Remove the return air cover and access the fan motor circuit board connection. 3. Reset power and turn the remote control fan command to Fan On mode. Motor Test: 1. If the motor doesn’t run, check for 310VDC between Pins 1 and 3. If it is not present, the indoor board is bad. If voltage is present, continue on.
Topic Testing Title Testing Louver Motors The easiest problems to solve will involve codes that are related to potential failure of temperature sensors. Common problems may include loose connections, open electrically, and out of calibration. Checking the condition of the sensors requires a temperature probe and an ohmmeter. If the louver does not operate with command from the remote control, either the indoor board is bad, or the louver motor is defective.
Topic Testing Title ENGLISH Testing Communication Circuit If an Error E7 occurs, perform the following test to determine if the indoor control board is functioning properly to send data to the outdoor unit. Perform this test with the unit powered and all wiring connected between indoor and outdoor unit. Make sure all wiring between the indoor and outdoor unit are correct. There should no splices between the indoor and outdoor unit wiring connecting terminals 1 or 3.
Wiring Diagram/DIP Switch Settings BL W W W CN16-1 CN3 SW2 W CN22(22-1) W CN20 Main control board BL Swing motor for lower louver Swing motor for upper louver 07 upp CN6 250VAC T5A L2 L1 CN10 W W Out +20 HEX LED4 LED5 SW1 RJ45 BOARD FUSE B To RJ45 DEVICE Wire disp YL CN17 CN35 CN11 CN16 CN31 BL Panel display Tr ENGLISH Tp Note: To Outdoor Unit DIP switches factory default setting SW3-1 SW3-2 SW3-3 SW3-4 SW3-5 SW3-6 SW3-7 SW3-8 SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 SW1-7
ENGLISH Error Codes The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may differ.
TROUBLESHOOTING & REFERENCES ENGLISH Table of Contents Special Functions....................................................................................................................................................................J-3 Auto Restart...........................................................................................................................................................................J-3 Forced Defrost......................................................................
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Special Topic Functions Title Auto Restart ENGLISH When this is enabled, the following functions will automatically resumes after a power loss: • ON/OFF State, Mode of Operation, Fan Speed, Temperature Setpoint, Louver Swing settings. • If there was a timer set or the system was in Sleep mode, they will be canceled upon restart. Wired Controller: • Auto Restart is Enabled by Default Wireless Controller: • Enable: Press the Sleep button 10 times within 5 seconds. You will hear 4 beeps as confirmation.
Special Functions ENGLISH Temperature Compensation This function allows you the capability to adjust the temperature compensation offset of any indoor unit. The adjusted value is programmed into the EEPROM.
Special Functions Guide 2 ENGLISH 1. Remove power to the unit and unplug the wired controller from the indoor unit PCB. 2. Connect the infrared remote signal receiver to indoor unit PCB. 0151800106E = socket CN29 0151800267 = socket CN21 3. Apply power to the unit. 4. Press the ON/OFF button on the remote control (HBS-01). 5. (Ignore this step if the display temperature is already OC,) Press MENU/OF button to switch the display temperature to OC, then press confirm. 6.
Matching Topic Title Tables ENGLISH 2U18MS2VHB / 2U20EH2VHA 4U36MS2VHB/ 4U36EH2VHA Combinations Port B Port A 1/4" x 3/8" 1/4" x 3/8" 7 9 9 12 12 12 7 7 9 7 9 12 Two Zone Total Capacity Required Adapter 14K 16K 18K 19K 21K 24K - Two Zone Three Zone Port C Port B Port A MS: 1/4" x 3/8" EH: 1/4" x 1/2" 1/4" x 3/8" 1/4" x 3/8" 7 9 9 12 12 12 18 18 18 7 9 9 12 9 12 12 12 18 12 7 7 9 7 9 12 7 9 12 7 7 9 7 9 9 9 12 7 12 ------------------7 7 7 7 9 7 9 7 7 9 Total Capacity 14K 16K 18K 19K
Resistance Chart Topic / Sensor Title Definitions Definition Temperature of outdoor ambient Temperature of outdoor condenser Temperature of outdoor discharge Temperature of outdoor defrost Temperature of outdoor suction Temperature of compressor driver module Current of the compressor Abbr.
Resistance Topic Title Values ENGLISH Highwall Horizontal Louver Motor Red Orange Yellow Pink Blue Grey Orange 193 Ω - Yellow 189.5 Ω 381.6 Ω - Pink 185.4 Ω 377.4 Ω 373.9 Ω - Highwall Vertical Louver Motor Blue 191.5 Ω 383.3 Ω 379.9 Ω 375.8 Ω - Grey 47 Ω 46.
Component Topic Title Ratings Ohms VAC 2.1K 208-230 ENGLISH 4-Way Valve Basepan Heater Ohms VAC 0.28K - 0.379K 208-230 Fan Motors VDC Outputs to DC Fan Motor (VDC) PIN # RED Probe Black Probe Value DC Fan Motor Pin Identification PIN # Color 6 Vdc GND 300~380VDC Abbr. Definition 1 Blue FG Revolution Pulse Output 5 Blank Blank Blank 2 Yellow Vsp Speed Control Voltage Input 4 GND GND GND 3 White Vcc Control Power Voltage Input 3 Vcc GND 15 ±1.
Refrigeration Diagrams ENGLISH 3U24MS2VHB Refrigerant Diagram J-10 TROUBLESHOOTING & REFERENCES
PAGE 101 NGLISH Refrigeration Diagrams 4U36MS2VHB REFERENCES ENGLISH TROUBLESHOOTING & REFERENCES J-11
ENGLISH MasterTopic Error Title Code Chart Outdoor Outdoor Outdoor Pro-Series Multi-Zone Single-Zone FAULT DESCRIPTION LED Display LED Display LED1 Flash (CAC) (CAC) (RAC) HIGHWALL CONSOLE Digital Display Digital Display COMPACT CASSETTE Panel LED Flash or ID PCB LED Flash Yellow Timer LED Green Run LED (PCB LED5) (PCB LED1) 1 1 1 Outdoor EEPROM failure F12 F12 2 1 2 2 2 IPM overcurrent or short circuit F1 F1 2 2 / / 3 Outdoor alternating current, over current protection F22 F22
Master Error Code Chart LARGE CASSETTE Panel Display (PB*****) HIGH STATIC Yellow Timer LED (PCB LED4) Green Run LED (PCB LED1) LED4 LED3 (Yellow) (Green) 2 1 15 2 2 2 16 / / 2 WIRED CONTROLLER MID-STATIC DUCT (MSP) SLIM DUCT LED4 LED3 (Yellow) (Green) YRE-17A QACT17A YRE-16B LED4 LED3 1 2 1 2 1 15 21 2 2 2 2 2 2 16 22 / / / / / / / 17 23 3 17 2 3 2 3 2 3 17 23 2 4 18 2 4 2 4 2 4 18 24 2 5 19 2 5 2 5 2 5 19 25 2 6 1A 2 6 2 6
Master Error Code Chart ENGLISH HIGHWALL Outdoor Outdoor Outdoor Pro-Series Multi-Zone Single-Zone FAULT DESCRIPTION LED Display LED Display LED1 Flash (CAC) (CAC) (RAC) CONSOLE COMPACT CASSETTE Panel LED Flash or ID PCB LED Flash Digital Display Digital Display / / / / Yellow Timer LED Green Run LED (PCB LED5) (PCB LED1) / / 28 / 28 / Liquid pipe sensor failure: Circuit A F10 F10 4 8 / 29 / Liquid pipe sensor failure: Circuit B F16 F16 4 9 / 30 / Liquid pipe sensor failure:
Master Error Code Chart LARGE CASSETTE Panel Display (PB*****) HIGH STATIC Yellow Timer LED (PCB LED4) Green Run LED (PCB LED1) LED4 LED3 (Yellow) (Green) / / / / 4 8 30 4 9 5 WIRED CONTROLLER MID-STATIC DUCT (MSP) SLIM DUCT LED4 LED3 (Yellow) (Green) YRE-17A QACT17A YRE-16B LED4 LED3 / / / / / / / 4 8 4 8 4 8 30 48 31 4 9 4 9 4 9 31 49 0 32 5 0 5 0 5 0 32 50 5 1 33 5 1 5 1 5 1 33 51 5 2 34 5 2 5 2 5 2 34 52 5 3 35 5 3 5 3
ENGLISH Outdoor Unit Error Codes When the system generates an error code, it will be displayed on the Service Monitor Board, the number of flashes on the PCB, and also on the indoor unit display panel. Temperature Sensor Error Codes The easiest problems to solve will involve codes that are related to potential failure of temperature sensors. Common problems may include loose connections, open or shorted, and out of calibration.
Outdoor Unit Error Codes Pressure-Related Error Codes Low Pressure Switch High Pressure Switch Error Code 42 & 43 Error Code 45 The low pressure switch will generate an Error Code 43 if open. An open high pressure switch will show an Error Code 42. Testing Procedure If the system generates either of these two codes, check the continuity of the switch to ensure it is not open or shorted.
ENGLISH Outdoor Unit Error Codes Error Codes Caused by Abnormal Refrigerant Circuit Conditions Error Code 8 This code indicates the temperature of the compressor hot gas is too high. This error occurs after the PCB has attempted to correct high temperature by reducing the compressor speed, adjusting the fan speed, or opening the EEV. Causes of this type of condition are typically a lack of refrigerant in the system, excessive heat in the conditioned space, or a restriction in the refrigeration circuit.
Outdoor Unit Error Codes This code indicates an IPM thermal overload. This error was generated by a temperature sensor located in the IPM heat sink. Causes of overheating are typically overcharge of refrigerant, excessively plugged coil, sensor open or shorted, or a non-condensable in system. Error Code 26 Module reset indicates possible PCB power anomalies. This usually occurs when low line voltage conditions are present. Error Code 27 The IPM has detected that the compressor current is too high.
Flow TopicCharts Title ENGLISH [1] Outdoor EEPROM Malfunction Code disappears after power off/on again EEPROM communication error; EEPROM data check error (model ID, checksum, etc.); EEPROM data logic error (wider data range, wrong order, etc.) No Possible causes: Check outdoor PCB, If faulty, replace it. • EEPROM is bad • Loose EEPROM wiring [2] Outdoor IPM over current or short circuit Input over current detected by PIM’s hardware.
Flow TopicCharts Title [4] Communication abnormal between PCB and IPM Possible causes: Is the compressor drive module input power normal (Test the No AC power supply voltage of the module’s power input ACL-ACN: normal value should between 196253VAC)? • The communication wire is bad Adjust communication wire Yes • The PCB is bad • The power module is bad Check the AC voltage between the two terminals of power filter Normal board board P7& the terminal 3 of relay RL1 (208-230VAC) Is the AC power suppl
Flow TopicCharts Title ENGLISH [8] Discharge temperature too high protection Compressor discharge temperature over 115°C. Error clears within 3 minutes if temperature lowers below 115°C. Error status lock if it occurs 3 times in 1 hour.
Flow TopicCharts Title [10] Outdoor defrosting temp. sensor Te abnormal [12] Outdoor ambient temp. sensor Ta abnormal [13] Discharging temp. sensor Td abnormal Sensor temperature has been detected below or higher than expected, or the sensor has been detected as a shorted or open circuit.
Flow TopicCharts Title ENGLISH [16] Lack of refrigerant or discharging pipe blocked Discharge & suction temperature Td-Ts≥80°C 10 minutes after compressor start. Error status locks if it occurs 3 times in 1 hour.
Flow TopicCharts Title [18] Compressor motor desynchronizing Possible causes: • The power supply is abnormal No Is supply voltage normal? Correct power supply Yes Is wire connection No between power module and compressor correct? • Incorrect compressor wiring Correct the wiring according to diagram Yes • The power module is bad Is power module is normal? • The compressor is bad No Replace power module Yes • The system is overload Is compressor normal (compressor coil resistor, insulation)?
Flow TopicCharts Title ENGLISH [42] Open high pressure switch High pressure switch: Switch circuit has been detected open for 30 seconds (after 3 minute of compressor run time). Error locks if it occurs 3 times in 1 hour. Possible causes: Power on Short the high pressure switch terminal on the PCB.
Flow TopicCharts Title [44] High pressure detected in system Possible causes: • High pressure sensor detection value is incorrect • Refrigerant overcharge Power off. Is pressure switch wiring connection ok? No ENGLISH The minimum temperature value of indoor pipe Tm and outdoor Ts is lower than -45 °C during cooling mode, or minimum temperature value of outdoor Tc and outdoor Te is lower than -45 °C. Reconnect Yes Use multimeter to check the high pressure switch.
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