SERVICE MANUAL 2-WAY ECO-i MULTI SYSTEM CHDX07263 CHDXR07263 * CHDX09663 CHDXR09663 * Outdoor Units Class C ECO-i W-2WAY 72 CHDX07263 CHDXR07263 * 96 CHDX09663 CHDXR09663 * Refrigerant R410A is used in the outdoor units. * Salt-Air Damage Resistant Specifications.
IMPORTANT! Please Read Before Starting When Installing… This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of your job to install or service the system so it operates safely and efficiently. …In a Room Properly insulate any tubing run inside a room to prevent “sweating” that can cause dripping and water damage to walls and floors.
Check of Density Limit The room in which the air conditioner is to be installed requires a design that in the event of refrigerant gas leaking out, its density will not exceed a set limit. The refrigerant (R410A), which is used in the airconditioner, is safe, without the toxicity or combustibility of ammonia, and is not restricted by laws imposed to protect the ozone layer. However, since it contains more than air, it poses the risk of suffocation if its density should rise excessively.
— CONTENTS — Section 1: CONTROL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 2. 3. Selecting Outdoor Unit for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 5: TROUBLE DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 1. Contents of Remote Controller Switch Alarm Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 2. 3. Outdoor Unit Control Panel LED Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4 Remote Controller Servicing Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5 4.
W-2WAY ECO-i SYSTEM Control Functions Contents 1. CONTROL FUNCTIONS 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 2. Selecting Outdoor Unit for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 3. Compressor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 4. Special Controls . . . . . . . . . . . . . . . . .
W-2WAY ECO-i SYSTEM Control Functions 1. Introduction The W-2WAY ECO-i is a system that allows multiple outdoor units to be connected. The outdoor units all contain inverter compressors, and the system does not utilize the sub units that were used in earlier systems. The outdoor unit where the unit No. is set to “1” includes the CCU (command controller unit) functions that are used to control the entire system. As a result, the system will not operate if no outdoor unit has been set as unit No. “1.
2. Selecting an Outdoor Unit for Operation W-2WAY ECO-i SYSTEM Control Functions 2-1. Outdoor Unit Operating Rules Because in this system all outdoor units contain an inverter compressor, ordinarily there is no absolute order of priority for compressor operation. Therefore there is no order of priority for the outdoor units. However, it is possible to operate the outdoor units in sequence, beginning with unit No.
W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-1. Compressors Mounted in the Outdoor Units [CHDX07263, CHDX09663] 72 96 Rotary DC Inverter DC Inverter Scroll ––– 5 hp Capacity Compressor 1 Installed compressor Compressor 2 1 hp = horsepower Constant speed INV INV Compressor 1 Type 72 Compressor 2 Compressor 1 Type 96 3-2. Compressor Selection Rules In cooling mode, all inverter compressors in the outdoor units are designed to operate simultaneously.
W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-3. Compressor Capacity Control The compressor operating conditions vary depending on the indoor unit operating conditions and the effects of indoor heat load, outdoor temperature and other factors. Unit No. 1 (CCU) calculates the required capacity according to these operating conditions, and allocates the capacity requirement among the outdoor units, according to the compressor start/stop rules.
W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-6-1. Evaporation Temperature (Te) Control: Control of Indoor Units Operating in Cooling Mode 60.8 °F 51.9 Horsepower increase permitted Area A 53.6 51.8 51.8 1 Horsepower increase 41.1 permitted Area AB 45.5 41.0 41.0 Horsepower increase prohibited Area B 35.6 35.4 Horsepower decrease 35.
W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-6-2. Condensation Temperature (Tc) Control: Control of Indoor Units Operating either in Cooling Mode or Heating Mode PX=125.6°F Thermostat OFF Area D PX –0.1 Horsepower decrease Area C 118.5 118.4 118.4 Horsepower increase prohibited Area B 116.6 116.6 116.4 Horsepower increase 113.0 permitted Area AB 112.8 Horsepower increase permitted Area A 109.4 100.
W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control (2) Current Protection Inverter compressor current control is composed of primary current control and secondary current control. Current protection control for the inverter compressor is performed by self-protection in the inverter circuit, and does not increase or decrease the compressor capacity. Primary current 1 16.0A~ 14.5A~ 13.5A~ Control Secondary current 75.0A or (302°F) Inverter compressors stop (HIC auto.
W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls In addition to ordinary heating and cooling operation, this system also includes the following 3 types of special controls for control of the system as a whole. 1. 4-way Valve Adjustment Control 2. System refrigerant oil recovery control 3. Defrost control 4-1.
W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-2-3. Refrigerant Oil Recovery Control between Systems (1) Simplified flow of system refrigerant oil recovery control Refrigerant oil recovery control between systems shall be performed as the flow mentioned below. Normal operation 3-minute stop Refrigerant oil recovery control between systems (Max.
W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-3-3. Frost detection (A) Frost detection does not occur for 5 minutes after operation starts. (B) Frost is detected when either condition 1 or 2 below is met. Condition 1: L2 line or below is detected twice, each time continuously for 4 minutes, when the compressor is operating. Condition 2: L1 line or below is detected for a total of 60 minutes when the compressor is operating.
W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-3-6. Outdoor unit cycle defrost Outdoor unit cycle defrost is performed in systems where 2 outdoor units are connected to the refrigerant system. 1 (1) Description of outdoor unit cycle defrost With this defrost method, when 1 outdoor unit operates in defrost mode (heat exchanger operating as a condenser), another outdoor unit operates as an evaporator in the same way as in ordinary heating mode.
W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-3-7. Defrost end judgment conditions Defrost ends when either of the below defrost end judgment conditions is met. Condition 1: The temperatures are 50°F or higher at all temperatures sensors installed on the outdoor unit heat exchanger coils. However, if there is any other outdoor unit where the defrost end condition has not been met, defrost control continues for all outdoor units, and system defrost control is not ended.
W-2WAY ECO-i SYSTEM Control Functions 5. Other Controls 5-1. Oil Control 5-1-1. Oil level Oil level Meaning Conditions of oil Judgement Sufficient The compressor contains oil more than the oil level which is necessary and sufficient for normal operation. There is no problem. 2 1 Slightly low The compressor contains sufficient oil but there is a possibility of shortage against the required oil level. Confirm that oil is returned after performing the oil control operation.
W-2WAY ECO-i SYSTEM Control Functions 6. Operation of Solenoid Valves 6-1. Refrigerant Control Valve [RCV] The main purpose of this valve is to detect the flow of refrigerant (refrigerant volume) on the indoor-unit side when the outdoor unit heat exchanger is functioning as a condenser. When the valve determines that there are signs of a low refrigerant level, refrigerant is supplied from the receiver tank to the system. (1) The OFF conditions take priority over the ON conditions for this valve.
W-2WAY ECO-i SYSTEM Control Functions 6. Operation of Solenoid Valves 6-3. Recovery Valve (ORVR) This valve recovers refrigerant oil from the balance tube to the compressor. (1) When unit is stopped This valve is always OFF. (2) When unit is operating (A) This valve turns ON when separator oil self-recovery control is in progress. 1 (B) This valve is ON when unit refrigerant oil recovery control is in progress (oil-receiving unit).
7. Outdoor Unit Electronic Thermostatic Expansion Valves [MOV1, MOV2 & MOV4] W-2WAY ECO-i SYSTEM Control Functions 7-1. Types of Electronic Thermostatic Expansion Valves [CHDX07263, CHDX09663] Capacity Electronic control valve 1 Electronic Electronic control valve control valve 2 Electronic control valve 4 72 Heat exchanger 1 valve Heat exchanger 2 valve 96 Heat exchanger 1 valve Heat exchanger 2 valve For SC circuit For SC circuit 1 7-2.
7. Outdoor Unit Electronic Thermostatic Expansion Valves [MOV1, MOV2 & MOV4] W-2WAY ECO-i SYSTEM Control Functions 7-4. SC Circuit Electronic Control Valve [MOV4] 1 (1) SC Control (Cooling Mode only) During cooling operation, the liquid refrigerant which condenses at the outdoor unit heat exchanger flows into the receiver tank, and SC (sub-cool = supercooling) approaches 0°F.
W-2WAY ECO-i SYSTEM Control Functions 8. Outdoor Fan Control 8-1. Fan mode These outdoor units utilize a DC fan motor that can be controlled in a maximum of 16 steps (16 modes). However, fan modes 15 and 16 can only be used if high static-pressure mode has been set. * For information concerning EEPROM settings, refer to the field application functions. 8-2. Outdoor Fan Min. Fan Mode and Max. Fan Mode Cooling operation Min. fan mode Outdoor air temp. > 59°F: 1 Outdoor air temp.
W-2WAY ECO-i SYSTEM Control Functions 9. Demand Control Serial-parallel I/O must be connected in order to perform demand control. The below input is received by serialparallel I/O, and demand control is performed. The demand values can be set as needed with this device. For more information, refer to the field application functions. 1 Demand setting Contact 1 Contact 2 Demand meaning Control No control Operates to the upper limit for the rated current.
W-2WAY ECO-i SYSTEM Control Functions 10. Indoor Unit Control of the Electronic Control Valve 10-1. Normal Control (1) Cooling operation Stopped Fan Thermostat OFF Cooling Thermostat ON Position of electronic control valve Outdoor unit Outdoor unit operating stopped 20 20 20 20 20 1 20 Performs SH control in the range of 55 – 480 pulses. – * The SH target value is controlled so that the E3 - E1 becomes between 2°F to 6°F, depending on the operating conditions.
10. Indoor Unit Control of the Electronic Control Valve W-2WAY ECO-i SYSTEM Control Functions 10-2.
W-2WAY ECO-i SYSTEM Control Functions 11. Rap Valve Kit Control A gas tube valve kit may be connected to the Type D indoor unit. When the gas tube valve kit is connected, operations of gas tube valve kit and indoor unit electronic thermostatic expansion valve are as shown in the table.
12. Indoor Unit Refrigerant Oil Self Recovery Control W-2WAY ECO-i SYSTEM Control Functions This control is carried out regularly in cooling mode only. (1) During stopped, fan or thermostat OFF condition, indoor unit expansion valve is opened regularly for 1 to 2 minutes regularly (at an interval of once every 2 hours.) (2) During the thermostat ON, the indoor unit electronic thermostatic expansion valve is opened about 10 pulses from the current status.
W-2WAY ECO-i SYSTEM Control Functions 13. Discharge Temperature (1) Discharge temperature protection alarm This device sets an upper limit discharge temperature of 222°F for all compressors. When the discharge temperature reaches 222°F, that compressor is stopped and restarted. If the same high discharge condition occurs 4 times, then an alarm occurs.
W-2WAY ECO-i SYSTEM Control Functions 14. Current Protection (1) Fan motor Alarm P22 Description Occurs when the fan motor detects over current, or when the motor is locked and does not turn. (2) Inverter compressor 1 Alarm P16 P26 P29 H31 Description Occurs during ordinary operation when overcurrent (27 A) is detected. Occurs under the same conditions as P16 when the inverter compressor is operating at or above 80 Hz.
W-2WAY ECO-i SYSTEM Control Functions 15. Pressure Sensor Failure This system contains 2 types of pressure sensors: a high-pressure sensor and a low-pressure sensor. (1) High-pressure sensor failure Alarms are emitted when the high-pressure sensor becomes an electrical open-circuit or a short-circuit conditions, and a broken wiring, short-circuit or poor connection to the PCB in the high-pressure sensor circuit.
W-2WAY ECO-i SYSTEM Control Functions 16. Backup Operation Backup Operation 16-1. Automatic Backup Operation This system includes a function for automatic backup operation. An alarm is also displayed to inform the operator that a failure has occurred. 1 (1) Alarms that result in automatic backup operation When compressor trouble or fan motor trouble makes emergency continued operation impossible, automatic backup operation mode is engaged.
W-2WAY ECO-i SYSTEM Control Functions 16. Backup Operation Outdoor unit tonnage Switches to turn ON 8 Ton INV+AC1+BU (C) Close all service valves at the failed outdoor units. (D) Reset the power at outdoor unit No.1. * When the PCB of the main unit is normal, by implementing the above settings while leaving the communication lines between indoor and outdoor units as they are, backup operation of units are possible.
W-2WAY ECO-i SYSTEM Control Functions 17. Service Maintenance Functions The outdoor unit EEPROM settings can be used for the following functions. 17-1. Outdoor Unit Noise Countermeasure: EEPROM 05 (set at each outdoor unit) This unit includes 3 types of Quiet modes. (However, when they are engaged, operation is in Quiet mode 24 hours a day.) Selecting a Quiet mode results in operation that gives priority to reducing noise.
W-2WAY ECO-i SYSTEM Control Functions 17. Service Maintenance Functions 17-5. Optional Solenoid Valve Control Operation Setting: Outdoor EEPROM C0 (set at each outdoor unit) Operation Setting 0 No output (setting at time of factory shipment) 1 Refrigerant shut-off valve control (for cooling when the outdoor air temperature is below standard conditions) 2 External liquid valve control (used in special cases when the discharge gas temperature is especially likely to rise) 17-6.
W-2WAY ECO-i SYSTEM Control Functions 18. Other Functions 18-1. Snowfall Sensor Functions: Outdoor EEPROM 04 A unit identified as having a snowfall sensor attached will periodically send a signal indicating the snowfall sensor input status to all outdoor units in the same system (or all wired outdoor units in the case of linked systems). It is therefore unnecessary to install and wire multiple snowfall sensors. (1) Snow fall sensor settings Operation Setting 1 0 Sensor input not present.
W-2WAY ECO-i SYSTEM Control Functions 18. Other Functions (3) Outdoor unit PCB LED indications in judgment mode Judgment items LED1 LED2 Recommended response Judgment mode Blinking Blinking - ON ON - Blinking OFF OFF Blinking Normal Insufficient gas Overcharge Judgment not possible Charge with refrigerant a little at a time. Recover refrigerant a little at a time.
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W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures Contents 2. OUTDOOR UNIT REPAIR PROCEDURES 1. Removing Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2. Removing Electrical Component Box and Duct . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 3. Discharging Compressor Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 4. Backup Operation . . . . . . . . . . . . . . .
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 1. Removing Panels Procedures: 2 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
2. Removing Electrical Component Box and Duct W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures Be sure to turn off the power before removing the electrical component box. Then check that the power LED (D53) on the control PCB of the outdoor unit is not lit. (1) Remove the electrical component box cover (remove 6 screws). (Fig. 3) • When closing the cover after the repair work, set the upper fringe of the cover should come to align inside the electrical component box. (Fig.
2. Removing Electrical Component Box and Duct W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures (7) Remove the lower duct: (remove 2 screws, and a hook) Lower duct 2 Fig. 6 (8) Remove the upper duct: (remove 3 screws) (Fig. 7) Upper duct Fig.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 3. Discharging Compressor Oil Discharged oil can be used for checking the condition of the system. Based on the appearance and color of the discharged oil, a judgment can be made on whether the system is operating normally or not. 3-1. Discharging Oil from Oil Separator Recover the refrigerant from the outdoor unit following the procedure given in “5. Recovering Refrigerant.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 4. Backup Operation This system includes an emergency automatic backup function that allows the A/C to operate during the period after trouble occurs until repairs are made. However, during repair and at other times, use manual backup operation. 4-1. Automatic Backup For details, refer to the control functions section.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 4. Backup Operation If the No. 1 unit (main unit) has failed, a different outdoor unit must be set as the No. 1 unit (main unit). • Settings at the failed No. 1 outdoor unit – No particular changes – However, close all service valves (gas tube, liquid tube, balance tube) at the failed outdoor unit, and disconnect the wiring between the outdoor units. • Settings at No.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 4. Backup Operation 4-2-2. Backup operation by setting the failed compressor not to operate Backup operation settings for each compressor INV compressor AC1 compressor Setting for backup operation OK Failed DIP switch S010: Turn BACK UP and AC1 ON. Failed OK DIP switch S010: Turn BACK UP and INV ON. Failed Failed DIP switch S010: Turn BACK UP, INV, and AC1 ON.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 5. Recovering Refrigerant The following equipment and tools are required: Jumper wire with clips, adjustable wrench, set of manifold gauge valves specially designed for refrigerant R410A only, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flathead screwdriver, and outdoor unit maintenance remote controller. 5-1.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 5. Recovering Refrigerant 5-2. Refrigerant Recovery Procedures (Indoor Unit) The flowchart below shows the refrigerant recovery procedures you must follow when replacing or repairing the indoor unit due to trouble in the refrigerant circuit. START 5-2-1. Cooling operation (for all units) Ball valve is provided in the indoor unit 5-2-3. Refrigerant recovery procedures (2) NO YES 5-2-2.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 5. Recovering Refrigerant (2) If the remote controller (RCS-TM80BG) is not available for maintenance of the outdoor unit 1 Determine the outdoor unit where the unit No. setting (S007) (3P DIP switch) (Blue) on the outdoor unit control PCB is set to No. 1. 2 Short-circuit the test-run pin (CN023) on the PCB to start test run operation.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 5. Recovering Refrigerant 5-2-3. Refrigerant recovery procedures (2): Indoor unit with no ball valve equipped Refrigerant in all indoor units and the refrigerant tubing circuit must be pumped into the outdoor unit. The maximum refrigerant storage capacity per a single outdoor unit is approx. 529 oz. Thus, in order to collect all refrigerant from the system, a separate refrigerant recovery unit is necessary.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 5. Recovering Refrigerant Manifold gauge Hi Lo Liquid tube service port (For 5/16" (7.94mm)-dia. connector) Refrigerant recover unit 2 Refrigerant recovery cylinder Gas tube service port (For 5/16" (7.94mm)-dia. connector) Fig. 11 5-3. Recovery of Refrigerant from Entire System (1) Turn off power to the entire outdoor system.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 6. Checking for Leakage After Repair 6-1. Pressure Check for Leakage of Outdoor Unit After completing repair of the outdoor unit, carry out the following leakage check. (1) Check that all service valves for gas tubes, liquid tube, and balance tube in the repaired outdoor unit (units necessary to carry out the pressurized leak check) are fully closed. (2) Connect the manifold gauge valves to the high- and low-pressure outlet ports of the outdoor unit.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 7. Evacuating System This procedure is carried out to ensure there is no remaining refrigerant or other gases (nitrogen, etc.) in the repaired outdoor unit and tubing. 7-1. Evacuating Repaired Outdoor Unit (1) Check that each service valve of the gas tubes, liquid tube, and balance tube in the outdoor unit are fully closed. (2) Connect the manifold gauge valves to the high-pressure and low-pressure sensor outlets of the outdoor unit. (Fig.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 8. Charging Compressor Oil 8-1. If Refrigerant Has Already Been Charged to Outdoor Unit Be sure to use an exclusive oil-charging tank for charging compressor oil. Prior to charging, carry out vacuum drying inside the tank and take care that no air (in the form of bubbles) is permitted to enter the tank. The oil charging procedures are given below. * The receiver tank used for maintenance may be used as an exclusive oil-charging tank.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 8. Charging Compressor Oil (2) Charging compressor oil into oil-charging tank Connect a piece of pipe to the lower valve and then insert the other end deeply into the bottom of the oil container. Make sure you avoid letting any air be sucked into the tube. Next, run the vacuum pump and open the manifold gauge valves, then open the upper and lower valves to begin charging oil into the charging tank.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 8. Charging Compressor Oil Next follow the instructions in “5-2-1. Cooling operation (for all units)” at the outdoor unit where oil will be charged, and start cooling operation at all units. When the operating conditions have stabilized, perform steps 1, 2, and 3 in sequence and open the valves.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 8. Charging Compressor Oil Oil tube outlet port (For 1/4" (6.35mm)-dia. connector) High-pressure outlet port (For 5/16" (7.94mm)-dia. connector) Oil Manifold gauge Hi Lo Vacuum pump Fig. 19 Low-pressure outlet port (For 5/16" (7.94mm)-dia. connector) 8-3.
9. Pumping Out Refrigerant from Outdoor Unit W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves for the refrigerant R410A, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flat-head screwdriver, and outdoor unit maintenance remote controller.
9. Pumping Out Refrigerant from Outdoor Unit W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures (8) Short-circuit the vacuum application pin on the outdoor unit control PCB of the unit to be repaired. Then turn ON the outdoor unit power. CAUTION When the vacuum application pin is short-circuited and the power is turned ON, all solenoid valves in the outdoor unit are forced open, allowing the refrigerant to be recovered from all tubes which are separated by solenoid valves.
9. Pumping Out Refrigerant from Outdoor Unit W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures (9) Close the gas tube and balance tube on the outdoor unit to be repaired. Then slowly close the liquid tube service valve. * When the low pressure at the outdoor unit to be repaired reaches 72.5 psi or below, pull out the SCT connector (2P) (YEL) (CN231) from the outdoor unit control PCB of that outdoor unit. Then immediately fully close the gas tube valve on that outdoor unit.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 10-1. Compressor Trouble Diagnosis and Check Methods Generally, compressor failures can be classified into the following categories. (1) Mechanical trouble (A) Locking (intrusion of foreign objects, galling, etc.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 10-2. Replacing the Compressor(s) 10-2-1. Replacing only the failed compressor (1) If backup operation is required, follow the instructions in “4. Backup Operation” and engage backup operation. (2) Follow the instructions in “10-3. Removing and Installing Compressors” and replace the failed compressor. (3) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 10-2-2. Replacing all compressors in a failed unit (1) Follow the instructions in “3. Discharging Compressor Oil” and drain the oil from the oil separator in the failed unit. Measure the amount of drained oil. (2) If backup operation is required, follow the instructions in “4. Backup Operation” and engage backup operation. (3) Follow the instructions in “10-3.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 10-2-3. Replacing all compressors in a system (1) Follow the instructions in “3. Discharging Compressor Oil” and drain the oil from the oil separators in all outdoor units. Measure the amount of drained oil. (2) Follow the instructions in “10-3. Removing and Installing Compressors” and replace all compressors in the system. (3) Follow the instructions in “6.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 10-2-4. Dry core cleaning If burning or other failures occur repeatedly at compressors within the same system, in many cases the cause is acid, sludge, carbon, or other substances that remain in the refrigeration cycle as the result of insufficient cleaning. If, when the oil is inspected, there is an outdoor unit where the oil color phase is 4.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor (14) Perform steps (1) – (4), and remove all dry cores. Then connect the tubing between the liquid (narrow) tube valves and the ball valves. (15) At all outdoor units where dry cores were removed, pressurize with 478.6 psi of nitrogen from the liquid tube service port and check for leaks. (16) After evacuating all nitrogen gas from the tubing, apply vacuum to all outdoor units where dry cores were removed until the pressure is –14.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 10-3. Removing and Installing Compressors When removing and installing compressors, use sufficient caution to ensure that moisture or other substances do not enter the refrigerant tubing system. 10-3-1. Replacing compressors * For all types 90 and 140, follow the replacement procedure below.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor Installation (1) Remove the rubber stopper and tube cap (brazed) from the new compressor. (2) Install the crankcase heater onto the new compressor. (3) Place the 2 pieces of cushioning rubber in the designated positions on the compressor. (4) Place the 2 pieces of cushioning rubber onto the legs of the new compressor.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor (B) Replacing the constant-speed compressor 1 (Compressor 2 on remote controller alarm display) Removal (1) Connect the manifold gauge to the high- and low-pressure outlet ports at the outdoor unit where the compressor will be replaced. Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement. (2) Follow the instructions in “1. Removing Panels” and “2.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor Installation (1) Remove the 2 brazed tube caps (2 pieces) from the compressor. (2) Remove hexagonal caps from the compressor. * When removing the hexagonal caps, hold the fixing nut at the main unit side so as not to loose it with a wrench or spanner. And then, loosen and remove the hexagonal cap. Hexagonal cap Oil equalizer tube connector parts 2 Fixing nut at the main unit side O-ring Fig.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor Brazing locations (3) Bolt Washer: 1 Rubber washer: 1 (1 each at the 3 locations) Protect the oil equalizer tube connectors Cushioning rubber guide Front view Fig. 28 (6) Set the remaining cushioning rubber beneath the new compressor leg at the locations shown in the figure 28.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor (C) Replacing multiple compressors Removal (1) Follow the instructions in “(A) Replacing the inverter compressor,” “(B) Replacing constant-speed compressor,” and remove the compressors. * There is no predetermined sequence for removal; any compressor may be removed first. Installation (1) Follow the instructions in “(A) Replacing the inverter compressor,” “(B) Replacing constant-speed compressor,” and install the compressors.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 11. High and Low Pressure Sensors The outdoor unit connection ports for the high and low pressure sensors employ Schrader-type push-to-release valves. Therefore it is not necessary to recover refrigerant when removing and installing them. 11-1. Removing the High and Low Pressure Sensor (1) Follow the instructions in “1. Removing Panels” and “2.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 12. Replacing 4-way Valve When replacing 4-way valve of type 96 (for type with 1 or 2 compressor), be sure to protect check valves, which are located adjacent to the 4-way valve, while performing replacement work. Type 72 (for type with 1 compressor) is not located near to the check valves, therefore no protection is necessary. 12-1.
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 12. Replacing 4-way Valve 12-2. When the replacement is not available from the right side of the unit (1) Follow the instructions of “10. Compressor” and remove the constant-speed compressor 2. (2) Connect the manifold gauge to the high and low-pressure outlet ports at the outdoor unit where the 4-way valve will be replaced. Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement.
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W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller Contents 3. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1. Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 2. Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 3. Ordinary Display Controls and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 1. Overview [Service Checker Section] OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER (RCS-TM80BG) for W-2WAY ECO-i N About the outdoor unit maintenance remote controller The outdoor unit utilizes nonvolatile memory (EEPROM) on its PCB. This allows EEPROM data to replace the setting switches that were present on previous PCBs. The outdoor unit maintenance remote controller is used to set and change these EEPROM data.
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 2. Functions N Functions on the ordinary display (1) Functions: Button operations can be used to perform the following functions. • Start/stop of all indoor units • Switching between cooling and heating • Test run of all indoor units • Double-speed operation of indoor units (Do not use for actual operation. Doing so may damage the devices.) (2) Display: The following can be displayed. • Alarm details display • No.
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions N Functions on the ordinary display • Connect the special service checker wiring to the outdoor unit PCB. The connection is shown in the figure below. Outdoor unit PCB RC (3P, BLU) PCB connector (3P, BLU) Special service checker wiring Relay connector (2P, WHT) Remote controller Ass’y 3 L If the communications line in the inter-unit control wiring is connected, it can be left as-is.
3. Ordinary Display Controls and Functions W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller L All units start/stop (Fig. 1) The (ON/OFF operation) button can be used to start and stop all the indoor units. • The LED illuminates if any indoor units is operating. • The LED blinks if an alarm at any of the operating indoor units occurs. LED L Cooling/heating change (Fig. 1) The (MODE) button can be used to change between heating and cooling operation.
3. Ordinary Display Controls and Functions W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller N Display (functions) • Use the temperature setting Item code 3 and buttons to change the item code. Item Remarks Outdoor unit alarm Alarm code display No. of connected indoor units Quantity Unit Nos. of connected indoor unit 7-segment display Operating status of indoor unit 7-segment display Thermostat ON status of indoor unit 7-segment display No.
3. Ordinary Display Controls and Functions (3) XX-YY R.C. Displays the outdoor unit sub-bus address which is currently selected. XX = Outdoor system address on main bus line (1 – 30) YY = Outdoor unit sub-bus address (1 – 8). “1” appears when there is only 1 outdoor unit. W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller Locations where , , and are displayed as shown in Fig. 3. 2 LED 3 Fig. 3 01: 4 units connected 02:
3. Ordinary Display Controls and Functions W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller N Concerning the 7-segment, 4-digit display remote controller timer display The unit Nos. of connected units are indicated by four 7-segment digits ( L Display of unit Nos. 1 − 20 OFF OFF 1 8 18 14 12 5 19 17 10 15 ON Meaning of display colon 16 13 9 7 ON OFF 11 4 2 20 ON 1 ~ 20 ON 21 ~ 40 41 ~ 60 61 ~ 80 is not displayed. Display of unit Nos.
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 4. Monitoring Operations Display the indoor unit and outdoor unit sensor temperatures. Press and hold the (CHECK) button and buttons simultaneously for 4 seconds or longer to engage temperature monitor mode. During temperature monitoring, is illuminates. (The display and operations are the same as for monitor mode using the indoor unit remote controller.
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 4. Monitoring Operations N Display of unit No. 1 (main unit) DN Description Remarks Intake temp. °F E1 °F E2 °F E3 °F Discharge temp. °F Discharge temp. setting °F Indoor unit electronic control valve position STEP Discharge temp. 1 °F Discharge temp. 2 °F High-pressure sensor temp. °F Heat exchanger gas 1 °F Heat exchanger liquid 1 °F Heat exchanger gas 2 °F Heat exchanger liquid 2 °F Outdoor air temp.
5. Outdoor Unit Alarm History Monitor W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller • Displays outdoor unit alarms only. • Check the indoor unit alarm histories separately using the indoor unit remote controllers or other control device. Press and hold the (CHECK) button and button simultaneously for 4 seconds or longer to engage outdoor unit alarm history mode. During temperature monitoring, illuminates.
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 6. Mode Settings N Setting mode 1 A Display of first 4 digits Press and hold the (CHECK) button and (VENTILATION) button simultaneously for 4 seconds or longer. Press the temperature setting and buttons to change the item code. The item codes and setting data are shown in the table of “List of Item Codes” on the next page. Press the timer time and buttons to 5 change the setting data.
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 6. Mode Settings N Setting mode 2 Press and hold the (CHECK) button, simultaneously for 4 seconds or longer. button, and button Press the temperature setting and buttons to change the item code. The item codes and setting data are shown in the table below. Press the timer time and buttons to change the setting data. button.
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W-2WAY ECO-i SYSTEM Remote Controller Functions Contents 4. REMOTE CONTROLLER FUNCTIONS 1. Simple Settings Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 2. Detailed Settings Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 3. Remote Controller Servicing Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
W-2WAY ECO-i SYSTEM Remote Controller Functions 1. Simple Settings Function • This allows the filter lifetime, operating mode [Remote Controller Functions Section] priority change, central control address, and other settings to be made for an individual or groupcontrol indoor unit to which the remote controller used for simple settings is connected.
W-2WAY ECO-i SYSTEM Remote Controller Functions 1. Simple Settings Function List of Simple Setting Items Item code Item Filter sign ON time (fitlter life time) Degree of filter fouling No. 0000 0001 0002 0003 0004 0005 0000 0001 0001 0002 0003 Setting data Description Not displayed 150 hours 2,500 hours 5,000 hours 10,000 hours Use the filter clogging sensor. Standard (setting at time of shipping) Highly fouled (Filter sign ON time is reduced to one-half the set time.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function • This allows the system address, indoor unit address, and other settings to be made for the individual or group-control indoor unit to which the remote controller used for detailed settings is connected. When detailed settings mode is engaged, operation stops at the individual or group-control indoor unit where the remote controller used for detailed settings is connected. Simple settings items can also be set at this time.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function List of Detailed Setting Items Item code Item Type Indoor unit capacity Setting data No. Description No. 0000 1-Way Air Discharge Semi-Concealed (A) 0001 0006 Concealed-Duct High Static Pressure (D) 0007 Ceiling-Mounted (T) 0010 Wall-mounted (F) 0011 Concealed Floor Standing (FM) 0001 22 (Type 7) 0003 0007 45 (Type 15) 80 (Type 24) 0012 (Except FHX2462, FMHX2462) 0018 Description No.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function Item code Item Setting data Description No. 0000 0001 No forced operation Forced operation for 1 minute 0060 0000 0001 0000 0001 Continuous operation None Ventilation fan operated by remote controller. Not used. (Body sensor is used.) Remote control sensor is used. 0000 Normal (displayed) 0001 Not displayed 0000 None 0001 Only stop time setting is enabled.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function Item code Item No. 0000 0001 Fan tap setting (Fan tap change in order to prevent drop in air discharge caused by filter installation) 0003 DC fan tap operating mode Standard High ceiling use For low static-pressure filter High ceiling use For low static-pressure filter 0000 0001 0002 For air-blocking material For air-blocking material No humidifier output 1 sec. 2 sec. 0058 0059 0060 0000 58 sec. 59 sec.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function Simple setting items Item code Item Description 01 Filter sign ON time setting (filter lifetime) Changes the indoor unit filter lifetime when a high-performance filter or other optional product is installed. 02 Degree of filter fouling Reduces the filter sign ON time to 1/2 of the standard time (setting at the time of shipping) for cases when filter fouling is more severe than normal.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function Item code Item 03 Central control address 04 Operating mode priority change Description Set when using a central control device. Used when setting the central control address manually from the remote controller. Note (1) NOTE (1) Explanation of operation mode priority change Enabled only in 2WAY MULTI heat-pump models.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function When the operating mode at the priority remote controller is changed, the operating modes of other remote controllers change as shown below.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function Item code Item Description 10 Unit type 11 Indoor unit capacity 12 System (outdoor unit) address 13 Indoor unit address 14 Group address 17 Cooling intake temperature shift Shifts the intake temperature during cooling and dry operation. (Enabled only when the body thermostat is used.) Increase this value when it is difficult to turn the thermostat ON.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function Item code Item 1F (Upper limit) 20 (Lower limit) 21 (Upper limit) 22 (Lower limit) 23 (Upper limit) 24 (Lower limit) Description Cooling Change to the remote control temperature setting range 25 (Upper limit) 26 (Lower limit) Heating Drying This setting changes the temperature range (upper limit and lower limit) which is set from the remote controller or central control device.
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function (Continued from previous page) Item code Item Description 3C Heat exchanger temperature for cold air discharge The heat exchanger temperature control point for prevention of cold air discharge during heating operation can be changed. 3d Fan output switching The indoor unit PCB optional output for the fan can be switched according to the purpose of use.
W-2WAY ECO-i SYSTEM Remote Controller Functions 3. Remote Controller Servicing Functions • The remote controller includes a number of servicing functions. Use these as needed for test runs and inspections. List of Servicing Functions Functions Test run Description Operation with forced thermostat ON Sensor temperature display Temperature display from each sensor Servicing check display Alarm history display Button operation Press and hold the Reset operation button for 4 seconds or longer.
W-2WAY ECO-i SYSTEM Remote Controller Functions 3. Remote Controller Servicing Functions Test Run Function Operates the unit with the thermostat forced ON. Press and hold the 2 button for 4 seconds or longer. “Test” appears on the remote controller LCD 3 display (Fig. 3). Start operation. Press the button to return to normal remote controller display. 1 4 RCS-TM80BG Fig.
W-2WAY ECO-i SYSTEM Remote Controller Functions 3. Remote Controller Servicing Functions N Sensor Temperature Display Function (displayed regardless of whether unit is operating or stopped) 2 The procedure below displays the sensor temperatures from the remote controller, indoor unit, and outdoor unit on the remote controller. Press and hold the and buttons simultaneously for 4 seconds or longer. The unit No. “X-X” (main unit No.
3. Remote Controller Servicing Functions Outdoor unit sensors Indoor unit sensors 02 Intake temp. 03 E1 04 E2 05 E3 06 Discharge temp. 07 Discharge temp. setting 08 Position of indoor unit electronic control valve W-2WAY ECO-i SYSTEM Remote Controller Functions Unit No.1 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 4 4 - 18 Unit No.2 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41 42 Discharge temp. 1 Discharge temp.
W-2WAY ECO-i SYSTEM Trouble Diagnosis Contents 5. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 2. Outdoor Unit Control Panel LED Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4 3. Remote Controller Servicing Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5 4. W-2WAY ECO-i Alarm Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wired remote control display Serial communication errors Mis-setting Remote controller is detecting Error in receiving serial communication signal. (Signal from error signal from indoor unit. main indoor unit in case of group control) Outdoor system address, indoor unit address, or indoor unit address independent/main/sub unit setting has not been made. (Auto address is not completed.) Error in transmitting serial communication signal.
Blinking: Wired remote control display Thermistor fault Outdoor unit Compressor intake temp. sensor (suction temp) High-pressure sensor Low-pressure sensor Heat exchanger 2 liquid temp. sensor Heat exchanger 2 gas temp. sensor Ceiling panel connection failure Protective Indoor unit device Thermal protector in indoor unit fan motor is activated. Float switch is activated. Fan inverter protection function activated. Outdoor unit Oxygen (O2) gas sensor activated. Compressor 1 (INV) discharge temp.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 2. Outdoor Unit Control Panel LED Display ( : ON : Blinking : OFF) LED (RED) Display meaning 1 2 After the power is turned ON (and automatic address setting is not in progress), no communication with the indoor units in that system is possible.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 3. Remote Controller Servicing Functions Sensor temperature display function (displayed both when unit is running and stopped) • Use the following check procedure to display the sensor temperatures from the remote controller, indoor unit, and outdoor unit sensors on the remote controller display. (CHECK) button and Press and hold the button simultaneously for 4 seconds or longer.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 3. Remote Controller Servicing Functions Sensor Temperature Relationship Table Location where sensor is installed Sensor address Sensor type Sensor address Remote controller temperature Sensor type Discharge temperature sensor Indoor unit intake temperature Indoor unit heat exchanger temperature (E1) Indoor unit Indoor unit electronic expansion valve position Indoor unit heat exchanger temperature (E3) Unit No. Unit No. 1 2 Unit No. Unit No.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes With type 96, the INV compressor is compressor 1, and the constant-speed compressor is compressor 2. With type 72, the INV compressor is compressor 1. Alarm code E06 E12 E15 E16 E20 E24 Alarm meaning Page E25 E26 E29 Outdoor unit failed to receive serial communication signals from indoor unit. Automatic address setting start is prohibited.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes E06 Alarm Alarm code E06 Alarm meaning Alarm conditions Probable cause Outdoor unit failed to receive serial communication signals from indoor unit. Outdoor unit failed to receive serial communication signals from indoor unit. (1) The indoor unit power was cut OFF after initial communications were completed. (2) An open circuit or short circuit occurred in the inter-unit control wiring after initial communications were completed.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes E16 Alarm Alarm code E16 Alarm meaning Alarm conditions Automatic address setting alarm (too many units) • The number of indoor units was too many when automatic address setting was performed. • After initial communications were completed, an unrecognized unit was detected. (1) The number of indoor units set at the indoor unit quantity setting SW (S004, S005) on the outdoor unit PCB is less than the number set.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes E25 Alarm Alarm code E25 Alarm meaning Alarm conditions Outdoor unit address setting failure (duplication) Communication by outdoor unit main-sub control wiring was received that contained the same address as that unit 5 times or more within 3 minutes. The unit number is set incorrectly. Check the unit number again. Correct the incorrect unit number setting.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes F04, F05 Alarm Alarm code F04, F05 Alarm meaning Compressor 1 discharge temperature sensor trouble, compressor 2 discharge temperature sensor trouble. (1) Discharge temp. of 212°F or higher was detected 20 minutes or more after that compressor stopped operating. (2) Discharge temp. of 158°F or higher was detected after all compressors had been stopped for 60 minutes or longer. (3) A/D step is 10 steps or less (short circuit).
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes Check Correction Example Notes (3) Leakage from the discharge tube check valve Trouble: Although the other compressor is operating and this compressor is stopped, the discharge temperature of this compressor rises together with the temperature of the other compressor. (4) The ambient temperature around the outdoor unit when it is stopped is 109°F or higher.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes F08 Alarm Alarm code F08 Alarm meaning Alarm conditions Outdoor air temperature sensor trouble (1) A/D step is 10 steps or less (short circuit). (2) A/D step is 1014 steps or more (open circuit) (1) Sensor malfunction (including connector) (2) PCB malfunction (1) Measure the sensor resistance. Check that the sensor is operating normally.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes F16 Alarm Alarm code F16 Alarm meaning High-pressure sensor trouble (abnormal rise in high pressure) (In some cases this may not be the result of a high-pressure sensor malfunction.) • High-pressure SW activated although the detected pressure was lower (439.4 psi or below) than the high-pressure SW activation pressure: Undershift • High-pressure SW failed to activate although the detected pressure was higher (497.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes Correction Example (1) Replace the high-pressure sensor. Caution: Because the high-pressure sensor connection employs a Schrader-type valve, it can be removed and replaced. However, the high-pressure sensor can be easily damaged by high voltage; therefore use sufficient caution with regard to static electricity. (2) Replace the PCB. (3) Correct the locations of problems in the refrigeration cycle.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes H11, H12 Alarm Alarm code H11, H12 Alarm meaning H11: Constant speed compressor 2 overcurrent alarm H12: Constant speed compressor 2 lock current alarm H11: During operation, the compressor current value exceeded 20 A for 30 seconds or longer. However this alarm is not detected for 4 seconds after the compressor starts. H12: During operation, the compressor current value exceeded 29 A for 4 seconds or longer.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes H03, H13 Alarm Alarm code H03, H13 Alarm meaning H03: Compressor 1 CT sensor disconnected or short-circuit H13: Compressor 2 CT sensor disconnected or short-circuit Compressor 1: Current value of more than 18.0 A is detected while the compressor 1 is stopped. Compressor 2: Current value at compressor 2 is less than 2.0 A when 2 seconds or more had passed after the compressors began operation and output.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes H06 Alarm Alarm code H06 Alarm meaning Alarm conditions Low-pressure switch activated A report occurs during A/C operation when the low-pressure sensor installed at constant low-pressure parts detects a pressure of 7.3 psi or less continuously for 2 minutes, or an instantaneous pressure of 2.9 psi or less. (These values represent abnormal low pressure which may damage the compressor.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes H07 Alarm Alarm code H07 Alarm meaning Alarm conditions No-oil alarm This alarm occurs when oil does not flow for a specified amount of time in tubing where oil flow constantly. (The presence of oil is detected by a temperature sensor.) Judgment method: Tcal (calculated by the formula below from the oil temperature) is compared with the discharge temperature. If Tcal is higher than the discharge temperature then oil is judged to be present.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes H08, H27 Alarm Alarm code H08, H27 Alarm meaning Alarm conditions Trouble (open circuit) with the oil sensor (connection) at compressor 1, compressor 2 This alarm occurs when a connector connection (pins 1 and 2 for compressor 1, pins 4 and 5 for compressor 2) is open. Disconnected connector Check that the connector is securely connected. (1) Connect the connector. (2) Correct the connection at connector pins 4 and 5.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes L04 Alarm Alarm code L04 Alarm meaning Alarm conditions Outdoor system address duplication Communication by inter-unit control wiring was received that contained the same address as that unit 5 times or more within 3 minutes. Incorrect outdoor system address settings Check the system address settings again. Correct the system address settings.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes P03, P17 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check Correction Example Notes P03, P17 Compressor 1 discharge temperature trouble; Compressor 2 discharge temperature trouble Temperature is 222°F or higher and pre-trip stop has occurred. The alarm occurs when pre-trip stop occurs more than once. However the pre-trip counter is cleared if the compressor operates continuously for a specified length of time.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes P04 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check 5 Correction Example Notes P04 High-pressure switch activated. The operation of the electronic circuit in the high-pressure switch may short-circuit the terminal depending on the pressure. A pressure of 478.6 psi or above will short-circuit the terminal. Once the terminal is short-circuited, it will remain in that state until the pressure goes below 377.1 psi.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes P16 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check Correction Example Notes P16 Compressor 1 (INV) overcurrent alarm This alarm occurs when current trouble or current detection trouble occur at an inverter frequency of less than 80 Hz after start (when trouble judgment current is detected in the primary or secondary current, or when an instantaneous secondary current of 13.5 A or higher is detected.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes P26 Alarm Alarm code P26 Alarm meaning Alarm conditions Inverter compressor high-frequency overcurrent alarm This alarm occurs when current trouble or current detection trouble occurs at an inverter frequency of 80 Hz or higher after start (when trouble judgment current is detected in the primary or secondary current, or when an instantaneous secondary current of 13.5 A or higher is detected).
5. Blinking Inspection Display on the Remote Controller W-2WAY ECO-i SYSTEM Trouble Diagnosis Blinking inspection display (2) (compressor magnet SW seizing detection) Alarm code (Blinking inspection display) Alarm meaning Compressor magnet SW seizing detected Status: Although an outdoor unit exists where the outdoor unit fan is running, no compressors in the system are operating. Because the fan is running only at the outdoor unit where seizing was detected, check the corresponding outdoor unit.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 6. Inspection of Parts (1) High-pressure switch (63PH1, 63PH2) • 63PH1: Disconnect the CN042 connector (3P, WHT) from the outdoor unit control panel. Measure the resistance between socket pins 1 and 3. The resistance is OK if the result is 0 Ω. • 63PH2: Disconnect the CN044 connector (3P, RED) from the outdoor unit control panel. Measure the resistance between socket pins 1 and 3. The resistance is OK if the result is 0 Ω.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 7. Test Pin When the test pin on the outdoor unit control PCB is short-circuited, each part can be operated individually. • After turning OFF the main unit power, short circuit the test pin (CN022, WHT), then turn the power back ON. Output is performed in the sequence shown in the table below, for 0.5 seconds each.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 8. Thermister Characteristics Curve 8-1. Room temp.sensor Temperature sensor 10 9 8 Resistance 7 6 5 4 3 2 1 10 15 20 25 30 35 40 45 50 55 Temperature (˚C) 8-2. Indoor heat exch.
W-2WAY ECO-i SYSTEM Trouble Diagnosis 8. Thermister Characteristics Curve 8-3. Outdoor temp. sensor, Compressor suction gas temp. sensor Outdoor heat exch. coil sensor (C1, C2) Outdoor temperature, Suction gas temperature (TS) sensor Heat exchanger temperature, Heat exchanger temperature sensor 35 8 30 7 6 25 5 20 Resistance Resistance 40 15 10 3 2 1 5 0 4 0 -20 -15 -10 -5 0 5 10 15 20 20 30 40 50 60 Temperature (°C) Temperature (°C) 8-4. Compressor discharge gas temp.
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