Page 1 Model No. Outdoor Unit Class 10HP 12HP 14HP 16HP 18HP 20HP U-8ME1E8 U-10ME1E8 U-12ME1E8 U-14ME1E8 U-16ME1E8 U-18ME1E8 U-20ME1E8 Model Name U-8ME1E8E U-10ME1E8E U-12ME1E8E U-14ME1E8E U-16ME1E8E U-18ME1E8E U-20ME1E8E Indoor Unit Class 4-Way Cassette S-22MU1E5 S-28MU1E5 S-36MU1E5 S-45MU1E5 S-56MU1E5 S-73MU1E5 S-106MU1E5 S-140MU1E5 S-160MU1E5 4-Way Cassette 60×60...
Page 2 IMPORTANT! Please Read Before Starting • Do not supply power to the unit until all wiring and tubing This air conditioning system meets strict safety and are completed or reconnected and checked. operating standards. As the installer or service person, it is an important part of your job to install or service the •...
Page 3 When Connecting Refrigerant Tubing Others • When performing piping work do • Do not touch the air inlet or the CAUTION not mix air except for specifIed sharp aluminum fins of the refrigerant (R410A) in refrigeration outdoor unit. You may hurt. cycle.
Page 4 The standards for minimum room volume are as follows. Check of Density Limit (1) No partition (shaded portion) 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 air conditioner, is safe, without the toxicity or combustibility of ammonia, and is not restricted by laws imposed to protect the ozone layer.
Page 5: Table Of Contents
— CONTENTS — Section 1: CONTROL FUNCTIONS-Outdoor Unit ......1-1 Introduction ............. 1-2 Selecting Outdoor Unit for Operation .
Page 6 Section 4: OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER ... . 4-1 Overview ............. . . 4-2 Functions .
Page 8: Control Functions-Outdoor Unit
2WAY SYSTEM Control Functions-Outdoor Unit 1. CONTROL FUNCTIONS-Outdoor Unit 1. Introduction ............1-2 2.
Page 9: Introduction
2WAY SYSTEM 1. Introduction Control Functions - Outdoor Unit The 2WAY system allows multiple outdoor units to be connected. -This system can be expanded to connect a maximum of 3 outdoor units. -The maximum system capacity is 60HP(at the Standard-COP mode). PCB setting of outdoor unit All the outdoor units contain inverter compressors.
Page 10: Selecting Outdoor Unit For Operation
2WAY SYSTEM 2. Selecting an Outdoor Unit for Operation Control Functions-Outdoor Unit 2-1. Outdoor Unit Operating Rules All outdoor units in this system contain an inverter compressor. Therefore there is no order of priority for the outdoor units. 2-2. Delayed Start of Outdoor Units 2-2-1.
Page 11: Compressor Control
2WAY SYSTEM 3. Compressor Control Control Functions - Outdoor Unit 3-1. Compressors Mounted in the Outdoor Units Outdoor unit Capacity 8 HP 10 HP 12 HP 14 HP 16 HP 18 HP 20 HP Compressor 1 DC Inverter Rotary 10 HP 6 HP 6 HP 10 HP...
Page 12 2WAY SYSTEM 3. Compressor Control Control Functions-Outdoor Unit Priority order flow of all compressors Inverter Compressor Constant speed Compressor Constant speed Compressor 2 Constant speed Compressor 3 Shorter operating time Longer Shorter operating time Longer Shorter operating time Longer operating time operating time operating time 3-2-5.
Page 13 2WAY SYSTEM 3. Compressor Control Control Functions - Outdoor Unit 3-4. Operating frequency range of inverter compressor - When one of the constant speed compressor mounted in the outdoor unit do not operate: 　The inverter compressor can operate between 25Hz and 100Hz. - When all constant speed compressors mounted in the outdoor unit operate: 　The inverter compressor can operate within the range in the table below.
Page 14 2WAY SYSTEM 3. Compressor Control Control Functions-Outdoor Unit Evaporation temperature area 15.0 12.0 10.0 Compressor capacity can increase A area Te_tgt_max. Compressor capacity cannot increase Te_tgt_min. B area Compressor capacity decreases C area Max. required level *The evaporation temperature area changes depending on the maximum required level of each indoor unit as shown in the right figure.
Page 15 2WAY SYSTEM 3. Compressor Control Control Functions - Outdoor Unit 3-6-2. Condensation temperature adjustment by roadmap control Target temperature of the B area is different between cooling and heating operation. Target lower temperature Target upper temperature (Tc_tgt_min) (Tc_tgt_max) Cooling 53.0℃ 55.0℃...
Page 16 2WAY SYSTEM 3. Compressor Control Control Functions-Outdoor Unit Area shift function B area is able to shift by EEPROM setting of outdoor unit. EEPROM setting in main outdoor unit Lower temperature of B area Lower temperature of B area = Tc_tgt_min + Te_L = Tc_tgt_max + Te_U CODE: 35 CODE: 36...
Page 17 2WAY SYSTEM 3. Compressor Control Control Functions - Outdoor Unit 3-7-2. Overcurrent protection of compressor Current limitation of compressor is shown in the table below. This limitation is to protect the compressor, so that the current of the power cable connected with the compressor is limited. * For the inverter compressor, this is the secondary current from HIC board.
Page 18: Output Of Pcb
2WAY SYSTEM 4. Output of PCB Control Functions-Outdoor Unit Item Remarks Indication on PCB Electromagnetic valve 4 way valve Save valve SAVE Refrigerant control valve Refrigerant balance valve Oil recoverly valve ORVR By-pass valve for oil ﬂ ushing Refrigerant interception valve Motor Operated Valve MOV for heat exchanger 1 MOV1...
Page 19 2WAY SYSTEM 4. Output of PCB Control Functions - Outdoor Unit 4-3. Refrigerant control valve [RCV] The main purpose of this valve is to adjust the flow of refrigerant (refrigerant volume) on the evaporator. When the valve determines that there are signs of a low refrigerant volume, refrigerant is supplied from the receiver tank to the system.
Page 20 2WAY SYSTEM 4. Output of PCB Control Functions-Outdoor Unit 4-4. Refrigerant balance valve [RBV] The main purpose of this valve is to adjust the flow of refrigerant (refrigerant volume) in the indoor unit heat exchanger at heating operation. When the valve determines that there are signs of excess refrigerant, refrigerant is recovered at the receiver tank.
Page 21 2WAY SYSTEM 4. Output of PCB Control Functions - Outdoor Unit 4-7. Refrigerant interception valve [O2] This valve works when the outdoor unit receives signal of the refrigerant leakage from the indoor unit. The indoor unit that transmits the signal of the refrigerant leakage gives “P14”alarm. To activate this function, it is necessary to set it to EEPROM on the main outdoor PCB and indoor PCB.
Page 22 2WAY SYSTEM 4. Output of PCB Control Functions-Outdoor Unit 4-9. SC Circuit Electronic Control Valve [MOV4] 4-9-1. 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°C. When SC is small and the length of the tubing connecting the indoor and outdoor units is long, the refrigerant flow in the indoor unit will be reduced sig- nificantly.
Page 23: Outdoor Fan Control
2WAY SYSTEM 5. Outdoor Fan Controls Control Functions - Outdoor Unit 5-1. No. of fan motor Outdoor unit Capacity 8HP 10HP 12HP 14HP 16HP 18HP 20HP No. of Fan Motor 5-2. Fan mode These outdoor units utilize a DC fan motor that can be controlled in a maximum of 15 steps (15 modes). Fan modes 15 can only be used if high static-pressure mode has been set.
Page 24: Outdoor Fan Control
2WAY SYSTEM 5. Outdoor Fan Controls Control Functions-Outdoor Unit 5-6. Silent Mode This unit includes 2 types of silent modes. Max. fan mode in silent mode Outdoor unit cacacity -3dB mode -5dB mode 8 HP 10 HP 12 HP 14 HP 16 HP 18 HP 20 HP...
Page 25 2WAY SYSTEM 5. Outdoor Fan Controls Control Functions - Outdoor Unit 5-8. Snow Removal Control 5-8-1. Independent control of outdoor unit This control is intended to prevent snow from accumulating on stopped fans. Fan motor works at 500rpm in the below conditions even if the outdoor unit stops. - Fan motor operates for 45 seconds and stops for 2 hours when ambient temperature is 5.1℃...
Page 26: Indoor Units Control From The Ccu
2WAY SYSTEM 6. Indoor Units Control from the CCU Control Functions-Outdoor Unit Some components of indoor unit are under CCU's control. 6-1. MOV of indoor unit 6-1-1. Indoor unit without RAP valve kit Mode of Mode of Compressor Thermostat MOV pulse of indoor unit indoor unit outdoor unit ON/OFF...
Page 27 2WAY SYSTEM 6. Indoor Units Control from the CCU Control Functions - Outdoor Unit 6-1-3. MOV minimum pulse adjustment function in cooling operation Minimum pulse which is set to 60 at the factory is able to adjust (shift). Minimum pulse under SH control = 60 + XX EEPROM setting in main outdoor unit CODE: A9 (for indoor unit capacity 5.6kW or less), AA (for indoor unit capacity 7.3kW),...
Page 28 2WAY SYSTEM 6. Indoor Units Control from the CCU Control Functions-Outdoor Unit 6-3-2. Heating mode Indoor unit fan operated in the heating mode is stopped from CCU at the following condition. - Discharge air temperature of indoor unit ≦ 20℃+XX - High pressure sensor temperature (HPS) in outdoor unit ≦...
Page 29: Oil Control
6. Indoor Units Control from the CCU 2WAY SYSTEM Control Functions - Outdoor Unit 7. Oil Control EEPROM setting in main outdoor unit CODE: 2B Setting No XX 20 minutes 30 minutes (factory preset mode) 40 minutes 50 minutes 60 minutes * The drain pump always operates when the indoor unit is thermostat ON in cooling operation.
Page 30 2WAY SYSTEM 7. Oil Control Control Functions-Outdoor Unit 7-2. Oil level detection The compressor oil in the crankcase is sent by bypass via a capillary tube to the low-pressure circuit. The temperature detected by an oil sensor is used to determine whether it is oil (warm) or refrigerant (cold). 7-3.
Page 31 2WAY SYSTEM 7. Oil Control Control Functions - Outdoor Unit EEPROM setting in main outdoor unit This regular interval system oil recovery can be CODE: 41 canceled by EEPROM setting in main outdoor unit. CODE: 30 Setting No Interval Setting No valid Cancel Interval of “10”...
Page 32 2WAY SYSTEM 7. Oil Control Control Functions-Outdoor Unit * It is possible to change the oil recovery control processing time EEPROM setting in main outdoor unit CODE: 43 Setting No Oil recovery control processing time 0 seconds 30 seconds 60 seconds (factory preset mode) Interval of “30”...
Page 33: Way Valve Adjustment Control
2WAY SYSTEM 8. 4-Way Valve Adjustment Control Control Functions - Outdoor Unit This control can be disabled by setting to EEPROM. EEPROM setting in main outdoor unit CODE: E0 Setting No 0 (factory preset mode) This control is performed (all indoor unit) This control is not performed (all indoor unit) Only type K1 is not performed The purpose of this control is to change over the 4-way valve appropriately with big differential pressure.
Page 34: Defrost Control
2WAY SYSTEM 9. Defrost Control Control Functions-Outdoor Unit 9-1. Defrost Methods This system uses the following 2 defrosting systems. System employs Defrost control method 1 outdoor unit in the refrigerant system Reverse cycle defrost 2 or more outdoor units Outdoor unit cycle defrost in the refrigerant system 9-2.
Page 35 2WAY SYSTEM 9. Defrost Control Control Functions - Outdoor Unit 9-4. Outdoor units where defrost occurs Even if the total time has not reached 35 minutes, if there is 1 or more outdoor units that fulfills the defrost detec- tion conditions, all operating outdoor units perform defrost control at the same time. EEPROM setting in main outdoor unit CODE: A3 Setting No...
Page 36 2WAY SYSTEM 9. Defrost Control Control Functions-Outdoor Unit 9-6. Reverse Cycle Defrost If there is 1 outdoor unit, a reverse cycle defrost will be carried out. • Defrost flow E: Evaporator operation C: Condenser operation C: Switching from evaporator operation to condenser operation E: Switching from condenser operation to evaporator operation Defrost preparation Defrost in progress...
Page 37 2WAY SYSTEM 9. Defrost Control Control Functions - Outdoor Unit 9-7. Outdoor unit cycle defrost Outdoor unit cycle defrost is performed in systems where 2 or more outdoor units are connected to the refrigerant system. 9-7-1. Description of outdoor unit cycle defrost In this defrosting, the outdoor units are devided into two groups.
Page 38: Upper Current Limitation Mode
2WAY SYSTEM 10. Upper Current Limitation Mode Control Functions-Outdoor Unit Serial-parallel I/O must be connected in order to perform upper current limitation mode. The below input is received by serial-parallel I/O, and upper current limitation mode is performed. The upper current limitation values can be set as needed with serial-prallel I/O. Upper current limitation setting Control...
Page 39: Alarm Information
2WAY SYSTEM 11. Alarm Information Control Functions - Outdoor Unit 11-1. Discharge temperature 11-1-1. Discharge temperature protection The upper limit discharge temperature is 106°C for all compressors. When the discharge temperature reaches 106°C, that compressor is stopped and restarted. If the same high discharge condition occurs XX times, then an alarm occurs.
Page 40 2WAY SYSTEM 11. Alarm Information Control Functions-Outdoor Unit List of overcurrent Inverter 6HP Inverter 10HP Secondary [ A ] 18.0 21.0 Primary [ A ] 18.0 23.0 11-2-2. Constant-speed compressor An alarm occurs when overcurrent or lock current is detected. List of overcurrent and lock currents Constant-speed 5HP Constant-speed 6HP...
Page 41 2WAY SYSTEM 11. Alarm Information Control Functions - Outdoor Unit 11-4. High pressure cut and Low pressure cut 11-4-1. Abnormal high pressure The high pressure switch works when it detects 3.6MPa or more. If one of the high pressure switches works, whole outdoor units stop and then restart. If the high pressure switch works after the system start for 4 times, an alarm occurs.
Page 42 2WAY SYSTEM 11. Alarm Information Control Functions-Outdoor Unit 11-5. 4-way valve failure If the maximum heat exchanger temperature of the outdoor unit that operates heating mode is 20℃ or higher than the ambient temperature and this condition continues for 15 minutes, it is possible that the 4way-valve has not changed during the heating operation.
Page 43: Backup Operation
2WAY SYSTEM 12. Backup Operation Control Functions - Outdoor Unit 12-1. Automatic Backup Operation This system includes a function for automatic backup operation. An alarm is displayed on the remote controller to inform the user that a failure has occurred. 12-1-1.
Page 44 2WAY SYSTEM 12. Backup Operation Control Functions-Outdoor Unit 12-1-2. Start of automatic backup operation If the above alarms occur, the alarm is displayed on the remote controller etc. Pressing the remote contoller button again starts automatic backup mode. 12-1-3. Backup operation infomation display If a wired remote controller is present, display blinks during operation.
Page 45 2WAY SYSTEM 12. Backup Operation Control Functions - Outdoor Unit All compressors of sub outdoor unit are backed up Examples: Combination of 3 outdoor units with 2 compressors Unit No. 1 Unit No. 2 Unit No. 3 Main unit Sub unit Sub unit CCU function Main outdoor unit Sub outdoor unit Sub outdoor unit...
Page 46: Other Functions
2WAY SYSTEM 13. Other Functions Control Functions-Outdoor Unit 13-1. Maintenance function for power supply stop of indoor unit. (E06 ignore) The system can continue operation even if outdoor unit cannot communicate with some indoor units. It is necessary to set to EEPROM the allowed number of operating indoor units not to be able to communicate. When the set value is 0 or more, the system continues operating even if it is not possible to communicate with the stopped indoor units However, allowed number of indoor units to be able to communicate is fixed to 75% of number of indoor units...
Page 47 2WAY SYSTEM 13. Other Functions Control Functions - Outdoor Unit 13-2. Auto Change Over Function It is able to select AUTO mode in each remort controller even in 2way system. The system switches the mode cooling/heating according to number of thermo ON mode. The system selects the mode that has more number of units with thermostat ON.
Page 48 2WAY SYSTEM 13. Other Functions Control Functions-Outdoor Unit 13-3-3. Outdoor unit PCB LED indications in judgment mode Judgment item LED1 LED2 Recommended response Judgment mode Blinking Blinking Normal Insufﬁ cient gas Blinking Charge with refrigerant a little at a time. Overcharge Blinking Recover refrigerant a little at a time.
Page 49: Detail Setting In Eeprom Of Outdoor Unit
2WAY SYSTEM Control Functions - Outdoor Unit Detail setting in EEPROM of outdoor unit 01 –4F: CCU parameters (P) : Factory preset mode Item Setting No Invalid 04 Snow removal control 0(P), 1, 2, 3 (For detail refer to 5-8-2) 05 Silent mode 0(P), 1, 2,3,,, ,,,11 , 12 (For detail refer to 5-6) 0(P)=Stop 1= ＬＬ...
Page 50 2WAY SYSTEM Control Functions-Outdoor Unit Item Setting No 0(P)=Valid, 1=Cancel (For detail refer to 7-5-1), System oil recovery in regular intervals 2=No use Factory use Invalid Invalid Condensation temperature adjustment -7, -6,,, ,,, 0(P),,, ,,, 6, 7 (For detail refer to 3-6-2) Lower temperature of B area (Tc_L) Condensation temperature adjustment -7, -6,,, ,,, 0(P),,, ,,, 6, 7...
Page 51 2WAY SYSTEM Control Functions - Outdoor Unit 80 –FF: Outdoor unit parameters Item Setting No 80 Invalid 0, 22, 25, 28, 32, 36, 40, 45, 50, 56, 63, 71, 80, 90, 100, 112, 125, 140, 160, 180, 200, 224(8HP), 250, 81 Outdoor unit capacity 280(10HP), 335(12HP), 355, 400(14HP), 450(16HP), 500(18HP), 560(20HP), 600, 630, 670, 710, 800, 840...
Page 52 2WAY SYSTEM Control Functions-Outdoor Unit Item Setting No C0 Factory use C1 Refrigerant interception valve (O2) 0(P), 1, 2 (For detail refer to 4-7) C2 Invalid C3 Invalid C4 Invalid C5 Factory use C6 Factory use C7 Invalid C8 Invalid E0 Indoor unit self oil recovery control 0(P), 1, 2 (For detail refer to 7-6) Time until thermostat OFF indoor unit by discharge...
Page 53 – MEMO – 1 - 46...
Page 54: Control Functions-Indoor Unit
2WAY SYSTEM Contents Control Functions - Indoor Unit 2. CONTROL FUNCTIONS-Indoor Unit 1. Room Temperature Control ..........2-2 2.
Page 55: Room Temperature Control
2WAY SYSTEM 1. Room Temperature Control Control Functions - Indoor Unit 1. Room Temperature Control The body sensor or remote controller sensor detects temperature in the room. The detected temperature is called the room temperature. The body sensor is the one contained in the indoor unit. Body sensor is enabled Remote controller sensor is enabled Set temp.
Page 56 2WAY SYSTEM 1. Room Temperature Control Control Functions - Indoor Unit Remote controller sensor is enabled Remote controller sensor is enabled Set temp. in remote Set temp. in remote 28℃ 28℃ 28℃ 20℃ 20℃ 20℃ controller controller Detected temp. by Detected temp.
Page 57: Heating Standby
2WAY SYSTEM 2. Heating Standby Control Functions - Indoor Unit 2. Heating Standby In heating mode, the indoor fan speed decreases to prevent cold air discharge from the indoor unit. During this time, (heating standby) is displayed on the remote controller. ①...
Page 58: Automatic Fan Speed Control
2WAY SYSTEM 3. Automatic Fan Speed Control Control Functions - Indoor Unit 3. Automatic Fan Speed Control ① The indoor fan mode is controlled as shown below during the automatic fan mode. ② The fan mode does not change for 3 minutes during cooling operation and 1 minute during heating operation once it is changed.
Page 59: Indoor Unit Mov Control
4. Indoor Unit MOV Control 2WAY SYSTEM Control Functions - Indoor Unit 5. Drain Pump Control 4. Indoor Unit MOV Control For details, refer to the section 1 "6. Indoor Unit Control from the CCU". The MOV is at 480 pulses in the following cases. ①...
Page 60: Automatic Heating/Cooling Control
2WAY SYSTEM 6. Automatic Heating/Cooling Control Control Functions - Indoor Unit 6. Automatic Heating/Cooling Control ① The operating mode is selected according to the set temperature and room temperature when the operation is started. Room temperature > set temperature in remote controller – 1˚C → Cooling mode Room temperature <...
Page 61: Discharge Air Temperature Control
7. Discharge Air Temperature Control 2WAY SYSTEM Control Functions - Indoor Unit 8. RAP Valve Kit Control 7. Discharge Air Temperature Control Discharge air temperature is controlled using the indoor unit discharge air temperature sensor. The discharge air temperature is set in the EEPROM on the PCB. The setting is different depending on the model. Refer to “15.
Page 62: Automatic Flap Control
9. Automatic Flap Control 2WAY SYSTEM Control Functions - Indoor Unit 10. Filter Sign 9. Automatic Flap Control The flap position can be selected from 5 positions. Operating mode Flap position Cooling/Dry F1・F2・F3 F1・F2・F3・F4・F5 Heating F1・F2・F3・F4・F5 ① The ﬂ ap moves to the following position automatically when the indoor unit is stopped. F0 (close): Types K1, T1, D1, U1, Y1 F5: Models other than the above ②...
Page 63: Electric Heater Control
11. Electric Heater Control 2WAY SYSTEM Control Functions - Indoor Unit 12. Fan Control during Dry Mode 11. Electric Heater Control The electric heater control is performed when an electric heater is installed with the indoor unit. The heater turns ON when all of the following conditions (1 to 3) are satisﬁ ed in heating mode (thermostat ON). ①...
Page 64: Ventilation Fan Output
13. Ventilation Fan Output 2WAY SYSTEM Control Functions - Indoor Unit 14. T10 Terminal 13. Ventilation Fan Output The out put of ventilation turns ON when the indoor unit turns ON. Also, when the indoor unit turns OFF, the output of the ventilation turns OFF. The ventilation fan can also be turned ON and OFF using the ventilation button on the remote controller.
Page 65: Parameter
2WAY SYSTEM 15. Parameter Control Functions - Indoor Unit 15. Parameter Heat/cool switching Correction temp. (heating) correction temp. (automatic heat/cool) Type Model Setting at time of factory Setting at time of factory shipment shipment 4-Way Cassette 4 deg 2 deg 2-Way Cassette 4 deg 2 deg...
Page 66: Outdoor Unit Repair Procedures
2WAY SYSTEM Outdoor Unit Repair Procedures 3. OUTDOOR UNIT REPAIR PROCEDURES 1. Removing Panels ............3-2 2.
Page 67: Removing Panels
2WAY SYSTEM 1. Removing Panels Outdoor Unit Repair Procedures Be sure to turn off the power before maintenance. Then check that the power CAUTION LED (D200) on the filter PCB of the outdoor unit is not lit. (1) Front panel removal (Fig. 1) •...
Page 68: Discharging Compressor Oil
2WAY SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures 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. 2-1.
Page 69 2WAY SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures Low-pressure outlet port High-pressure outlet port (for ø7.94mm-dia connector) (for ø7.94mm-dia connector) Manifold gauge Liquid tube service port Nitrogen gas (for ø7.94mm-dia connector) Packless valve or the like Gas tube service port Container (for ø7.94mm-dia connector) Oil balance tube service port...
Page 70 2WAY SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures Low-pressure outlet port (for ø7.94mm-dia connector) Liquid tube service port High-pressure outlet port (for ø7.94mm-dia connector) (for ø7.94mm-dia connector) Manifold gauge Nitrogen gas Packless valve or the like Container Oil balance tube service port Gas tube service port (For 7.94mm-dia.
Page 71: Backup Operation
2WAY SYSTEM 3. Backup Operation Outdoor Unit Repair Procedures 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. 3-1.
Page 72 2WAY SYSTEM 3. Backup Operation Outdoor Unit Repair Procedures After recovery work is completed, wire the communication lines between indoor CAUTION and outdoor units again. If it not finished yet, an alarm is emitted immediately. (2) Adjusting the refrigerant for backup operation During backup operation, all of the service valves on the failed unit are closed.
Page 73: Recovering Refrigerant
2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 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.
Page 74 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures Manifold gauge High-pressure outlet port (for ø7.94mm-dia connector) Refrigerant Low-pressure outlet port recovery unit (for ø7.94mm-dia connector) Gas tube service port Refrigerant recovery cylinder (for ø7.94mm-dia connector) Liquid tube service port (for ø7.94mm-dia connector) 14HP / 16HP type Fig.
Page 75 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4-2. 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 4-2-1.
Page 76 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures (2) If the remote controller (CZ-RTC2) 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.
Page 77 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4-2-3. Refrigerant recovery procedures (2): Indoor unit with no ball valve equipped Refrigerant in all indoor units and the refrigerant tubing circuit can be pumped into the outdoor unit. The maximum refrigerant storage capacity per a single outdoor unit is approx.
Page 78 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures Low-pressure outlet port High-pressure outlet port (for ø7.94mm-dia connector) (for ø7.94mm-dia connector) Manifold gauge Refrigerant Liquid tube service port recover unit (for ø7.94mm-dia connector) Gas tube service port (for ø7.94mm-dia connector) Refrigerant recovery cylinder 8HP / 10HP / 12HP type...
Page 79 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures Low-pressure outlet port (for ø7.94mm-dia connector) High-pressure outlet port (for ø7.94mm-dia connector) Manifold gauge Refrigerant Liquid tube service port recover unit (for ø7.94mm-dia connector) Refrigerant recovery cylinder Gas tube service port 18HP / 20HP types (for ø7.94mm-dia connector) Fig.
Page 80: Checking For Leakage After Repair
2WAY SYSTEM 5. Checking for Leakage After Repair Outdoor Unit Repair Procedures 5-1. 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.
Page 81 2WAY SYSTEM 5. Checking for Leakage After Repair Outdoor Unit Repair Procedures Manifold gauge High-pressure outlet port (for ø7.94mm-dia connector) Low-pressure outlet port (for ø7.94mm-dia connector) Nitrogen gas Liquid tube service port (for ø7.94mm-dia connector) Gas tube service port (for ø7.94mm-dia connector) 14HP / 16HP type Fig.
Page 82: Evacuating System
2WAY SYSTEM 6. Evacuating System Outdoor Unit Repair Procedures This procedure is carried out to ensure there is no remaining refrigerant or other gases (nitrogen, etc.) in the repaired outdoor unit and tubing. 6-1. 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.
Page 83 2WAY SYSTEM 6. Evacuating System Outdoor Unit Repair Procedures Manifold gauge High-pressure outlet port (for ø7.94mm-dia connector) Vacuum pump Low-pressure outlet port (for ø7.94mm-dia connector) Liquid tube service port (for ø7.94mm-dia connector) Gas tube service port (for ø7.94mm-dia connector) 14HP / 16HP type Fig.
Page 84: Charging Compressor Oil
2WAY SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7-1. 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.
Page 85 2WAY SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures Close Open Upper valve Manifold gauge Close Open Lower valve Vacuum pump Fig. 10 When the predetermined amount of oil has been charged into the oil-charging tank, immediately close the lower valve.
Page 86 2WAY SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures High-pressure outlet port (for ø7.94mm-dia connector) Upper valve Low-pressure outlet port (for ø7.94mm-dia connector) Manifold gauge Liquid tube service port (for ø7.94mm-dia connector) Lower valve Gas tube service port (for ø7.94mm-dia connector) 14HP / 16HP type Fig.
Page 87 2WAY SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures Next follow the instructions in “4-2-1. 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.
Page 88 2WAY SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures The oil absorbs moisture readily. This work must be completed quickly. CAUTION Low-pressure outlet port (for ø7.94mm-dia connector) Manifold gauge High-pressure outlet port (for ø7.94mm-dia connector) Vacuum pump Oil balance tube service port (for ø7.94mm-dia connector) Gas tube service port (for ø7.94mm-dia connector)
Page 89: Pumping Out Refrigerant From Outdoor Unit
2WAY SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit 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. This work is performed in order to collect the refrigerant from an outdoor unit where repairs (other than compressor replacement) will be performed into other outdoor units and indoor units, and the refrigerant tubing.
Page 90 2WAY SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit 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. When the vacuum application pin is short-circuited and the power is turned ON, all CAUTION solenoid valves in the outdoor unit are forced open, allowing the refrigerant to be recovered from all tubes which are separated by solenoid valves.
Page 91 2WAY SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit 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 ser- vice valve. * When the low pressure at the outdoor unit to be repaired reaches 0.5 MPa or below, pull out the SCT connec- tor (2P) (YEL) (CN061) from the outdoor unit control PCB of that outdoor unit.
Page 92: Compressor
2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-1. 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.) (B) Pressure rise failure (damaged valve, seal, bearing, or other component) (C) Noise (damaged stator rotor, valve, or other component) (2) Electrical trouble (A) Coil burning...
Page 93 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-2. Replacing the Compressor(s) 9-2-1. Replacing only the failed compressor (1) If backup operation is required, follow the instructions in “3. Backup Operation” and engage backup operation. (2) Follow the instructions in “9-3. Removing and Installing Compressor” and replace the failed compressor. (3) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
Page 94 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-2-2. Replacing all compressors in a failed unit (1) Follow the instructions in “2. Discharging Compressor Oil” and drain the oil from the oil separator in the failedunit. Measure the amount of drained oil. (2) If backup operation is required, follow the instructions in “3.
Page 95 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-2-3. Replacing all compressors in a system (1) Follow the instructions in “2. Discharging Compressor Oil” and drain the oil from the oil separators in all out- door units. Measure the amount of drained oil. (2) Follow the instructions in “9-3.
Page 96 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-2-4. 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 4.0 or higher, or where a sharp odor is present, carry out all steps below to perform dry core cleaning.
Page 97 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures (16) After evacuating all nitrogen gas from the tubing, apply vacuum to all outdoor units where dry cores were removed until the pressure is –101kPa (–755 mm Hg, 5 Torr) or less. (17) INSTALLATION: Refer to the “Information for the Person in Charge of Installation”...
Page 98 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-3. 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. 9-3-1. Replacing compressors (A) Replacing the inverter compressor (For all models) Removal (1) Connect a manifold gauge to the high- and low-pressure outlet ports at the outdoor unit where the compressor will be replaced.
Page 99 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures (7) Remove the 3 bolts, and remove the washers and rubber washers. Remove the cushioning rubbers and lower the compressor position to Remove the cushioning rubber using disconnect the tubing easily. a crowbar. * Place something at the contact to protect the bottom plate from damage.
Page 100 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures (10) Pull the compressor toward you. Remove the inverter compressor from the space between the AC1 compressor and service valves. Be careful not to damage cross oil tubing. Installtion (1) Remove the rubber stopper and tube cap (brazed) from the new compressor. (2) Install the crankcase heater onto the new compressor.
Page 101 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures (5) Place the remaining cushioning rubber onto the new compressor. (6) Anchor the 3 compressor legs using the bolts, washers, and rubber washers. (7) Remove the flare nut from the new compressor, and connect the tube-with-flare-nut. (8) Shape the tubes and insert them at the 2 brazing locations.
Page 102 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures (4) Remove the cap at the compressor terminal plate. Disconnect the power cable. (5) Remove the crankcase heater. (6) Disconnect the tube-with-flare-nut using wrenches. At this time, cover the tube in place with waste cloth while watching out for oil leaks.Then cap the disconnected tube and mount the flare nut on the compressor.Tighten the flare nut with a seal bonnet(1/4") in it.
Page 103 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures Installtion (1) Remove the rubber stopper and tube cap (brazed) from the new compressor. (2) Install the crankcase heater onto the new compressor. (3) Temporary mount 2 cushion rubbers with bolts at the position in front. Set up the leg of the the new compressor onto the 2 cushion rubbers.
Page 104 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures (C) Replacing the constant-speed compressor 1 (For models U-18ME1E8(E), U-20ME1E8(E)) 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) Remove the panels and the corresponding parts from the outdoor unit where the compressor will be replaced.
Page 105 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures (7) Remove the bolts(3 locations), washers, and spacers. * Use a crowbar to remove the cushioning rubbers just like inverter compressor removal procedure. • Protect the sensors and surrounding plates, rubber, lead wires, clamps, and other items.
Page 106 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures Installtion (1) Remove the rubber stopper and tube cap (brazed) from the new compressor. (2) Install the crankcase heater onto the new compressor. (3) Temporary mount 2 cushion rubbers with bolts at the position in front. Set up the leg of the the new compressor onto the 2 cushion rubbers.
Page 107 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures (C) Replacing the constant-speed compressor 2 (For models U-18ME1E8(E), U-20ME1E8(E)) 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) Remove the panels and the corresponding parts from the outdoor unit where the compressor will be replaced.
Page 108 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures (7) Remove the bolts(3 locations), washers, and spacers. * Use a crowbar to remove the cushioning rubbers just like inverter compressor removal procedure. • Protect the sensors and surrounding plates, rubber, lead wires, clamps, and other items.
Page 109 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures Installtion (1) Remove the rubber stopper and tube cap (brazed) from the new compressor. (2) Install the crankcase heater onto the new compressor. (3) Temporary mount 2 cushion rubbers with bolts at the position in front. Set up the leg of the the new compressor onto the 2 cushion rubbers.
Page 110: Outdoor Unit Maintenance Remote Controller
2WAY SYSTEM Outdoor Unit Maintenance Remote Controller 4. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1. Overview ............. . 4-2 2.
Page 111: Overview
2WAY SYSTEM 1. Overview Outdoor Unit Maintenance Remote Controller OUTDOOR UNIT MAINTENANCE REMOTE [Service Checker Section] CONTROLLER (CZ-RTC2) for W-2WAY ECO-i ■ 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.
Page 112: Functions
2WAY SYSTEM 2. Functions Outdoor Unit Maintenance Remote Controller ■ 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 •...
Page 113: Ordinary Display Controls And Functions
2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ 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...
Page 114 2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ● All units start/stop (Fig. 1) <Operation> (ON/OFF operation) button can be used to start and stop all the indoor units. • The LED illuminates if any indoor units is operating. •...
Page 115 2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ Display (functions) • Use the temperature setting buttons to change the item code. Item code Item Remarks ➀ Outdoor unit alarm ➁ Alarm code display No. of connected indoor units Quantity Unit Nos.
Page 116 2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller (3) XX-YY R.C. ➀ ➁ ➂ Locations where , and are displayed Displays the outdoor unit sub-bus address which is as shown in Fig. 3. currently selected. XX = Outdoor system address on main bus line (1 –...
Page 117 2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ Concerning the 7-segment, 4-digit display remote controller timer display The unit Nos. of connected units are indicated by four 7-segment digits ( ) and a colon. ●...
Page 118: Monitoring Operations
2WAY SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display the indoor unit and outdoor unit sensor temperatures. <Operating procedure> ➀ Press and hold the (CHECK) button and buttons simultaneously for 4 seconds or longer to engage temperature monitor mode. During temperature monitoring, is illuminates.
Page 119 2WAY SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller ■ Display of unit No. 1 (main unit) Description Remarks Intake temp. °C °C °C °C Indoor unit Discharge temp. °C Discharge temp. setting °C Indoor unit electronic control valve position STEP Discharge temp.
Page 120: Outdoor Unit Alarm History Monitor
2WAY SYSTEM 5. Outdoor Unit Alarm History Monitor 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. <Operating procedure> ➀ Press and hold the (CHECK) button and button simultaneously for 4 seconds or longer to engage...
Page 121: Mode Settings
2WAY SYSTEM 6. Mode Settings Outdoor Unit Maintenance Remote Controller ■ Setting mode 1 Display of ﬁ rst 4 digits <Operating procedure> ➀ Press and hold the (CHECK) button and (VENTILATION) button simultaneously for 4 seconds or longer. ➁ Press the temperature setting buttons to change the item code.
Page 122 2WAY SYSTEM 6. Mode Settings Outdoor Unit Maintenance Remote Controller ■ Setting mode 2 <Operating procedure> ➀ Press and hold the (CHECK) button, button, and button simultaneously for 4 seconds or longer. ➁ Press the temperature setting buttons to change the item code.
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Page 124: Remote Controller Functions
2WAY SYSTEM Remote Controller Functions 5. REMOTE CONTROLLER FUNCTIONS 1. Simple Settings Function ..........5-2 2.
Page 125: Simple Settings Function
2WAY SYSTEM 1. Simple Settings Function Remote Controller Functions • 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 group- control indoor unit to which the remote controller used for simple settings is connected.
Page 126 2WAY SYSTEM 1. Simple Settings Function Remote Controller Functions List of Simple Setting Items Setting data Item code Item Description 0000 Not displayed 0001 150 hours 0002 2,500 hours Filter sign ON time (ﬁ tlter life time) 0003 5,000 hours 0004 10,000 hours 0005...
Page 127: Detailed Settings Function
2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions • 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.
Page 128 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting the Flap Separately (When setting the CZ-RTC2) Press the timer time buttons to select 1) The 4-air outlet flap can be adjusted separately during the desired setting data. operation. When not adjusted separately, all flaps operate Flap position in the same manner.
Page 129 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions List of Detailed Setting Items Setting data Item code Item Description Description Description 4-Way Casstte (60×60) 0001 0002 2-WAY Cassette (L1) 0003 1-Way Cassette (D1) (U1, Y1) Low Silhouette Ducted (F1) High Static Pressure Type 0005...
Page 130 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 5 minutes (1B) Forced thermostat ON time 0001 4 minutes –010 –10°C –009 –9°C Cooling discharge –008 –8°C temperature shift 0010 10°C –010 –10°C –009 –9°C Heating discharge...
Page 131 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 No forced operation 0001 Forced operation for 1 minute Automatic drain pump operation 0060 Continuous operation 0000 None Ventilation fan operation 0001 Ventilation fan operated by remote controller. 0000 Not used.
Page 132 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description DC fan tap operating Purpose mode 0000 Standard Standard (setting at shipment) High ceiling use High ceiling setting 1 (with standard panel) 0001 For low Ultra long-life ﬁ...
Page 133 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Simple setting items Item code Item Description Filter sign ON time setting Changes the indoor unit ﬁ lter lifetime when a high-performance ﬁ lter or other (ﬁ lter lifetime) optional product is installed. Reduces the ﬁ...
Page 134 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description Set when using a central control device. Central control address Used when setting the central control address manually from the remote controller. Operating mode priority change Note (1) NOTE (1) Explanation of operation mode priority change Enabled only in 2WAY System heat-pump models.
Page 135 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions When the operating mode at the priority remote controller is changed, the operating modes of other remote controllers change as shown below. Mode change at priority remote controller Operating modes at other remote controllers Current mode New mode Current mode...
Page 136 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description Unit type Set when the indoor unit EEPROM memory is replaced during servicing. Indoor unit capacity System (outdoor unit) address These are not set at the time of shipping from the factory. These must be set after installation if automatic address setting is not Indoor unit address performed.
Page 137 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description 1F (Upper limit) Cooling 20 (Lower limit) 21 (Upper limit) This setting changes the temperature range (upper limit and lower limit) Heating 22 (Lower limit) Change to the remote which is set from the remote controller or central control device.
Page 138 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions (Continued from previous page) Item code Item Description Heat exchanger temperature for The heat exchanger temperature control point for prevention of cold air cold air discharge discharge during heating operation can be changed. The indoor unit PCB optional output for the fan can be switched Fan output switching according to the purpose of use.
Page 139 2WAY SYSTEM 2WAY SYSTEM 2. Detailed Settings Function 2. Detailed Settings Function Remote Controller Functions Remote Controller Functions Selecting the DC fan motor tap (when setting from the PCB) 4-Way Cassette type <Procedure> Stop the system before performing these steps. Open the electrical component box cover, then check the indoor unit control PCB.
Page 140: Remote Controller Servicing Functions
2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions • The remote controller includes a number of servicing functions. Use these as needed for test runs and inspections. List of Servicing Functions Functions Description Button operation Reset operation Unit status Operation with Press and hold the button...
Page 141 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Test Run Function Operates the unit with the thermostat forced ON. <Procedure> ➀ Press and hold the button for 4 seconds or longer. ➁ “Test” appears on the remote controller LCD display (Fig.
Page 142 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions ■ Sensor Temperature Display Function (displayed regardless of whether unit is operating or stopped) The procedure below displays the sensor temperatures from the remote controller, indoor unit, and outdoor unit on the remote controller. <Procedure>...
Page 143 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Outdoor unit sensors Indoor unit sensors Unit No.1 Unit No.2 Unit No.3 Intake temp. Discharge temp. 1 Discharge temp. 2 High-pressure sensor temp. Heat exchanger gas 1 Heat exchanger liquid 1 Heat exchanger gas 2 Discharge temp.
Page 144: Trouble Diagnosis
2WAY SYSTEM Trouble Diagnosis 6. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display ......6-2 2.
Page 145: Contents Of Remote Controller Switch Alarm Display
2WAY SYSTEM 1. Contents of Remote Controller Trouble Diagnosis Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Serial Remote controller is detecting Error in receiving serial communication signal. (Signal from communication error signal from indoor unit.
Page 146 2WAY SYSTEM 1. Contents of Remote Controller Trouble Diagnosis Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Thermistor fault Outdoor unit Compressor 1 (INV) discharge temp. sensor Compressor 2 (constant speed) discharge temp. sensor Compressor 3 (constant speed) discharge temp.
Page 147: Outdoor Unit Control Panel Led Display
2WAY SYSTEM 2. Outdoor Unit Control Panel LED Display Trouble Diagnosis : ON : Blinking : OFF) LED (RED) Display meaning 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. (Both ON) After power is turned ON (and automatic address setting is not in progress), one or more indoor units are conﬁ...
Page 148: Remote Controller Servicing Functions
2WAY SYSTEM 3. Remote Controller Servicing Functions Trouble Diagnosis 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.
Page 149 2WAY SYSTEM 3. Remote Controller Servicing Functions Trouble Diagnosis Sensor Temperature Relationship Table Location where sensor Sensor address Sensor type Sensor address Sensor type is installed Remote controller temperature Discharge temperature sensor Indoor unit intake temperature Indoor unit heat exchanger Indoor unit electronic expansion Indoor unit temperature (E1)
Page 150 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis With type 8HP, the INV compressor is compressor 1 only. With types 10HP, 12HP, 14HP and 16HP, the INV compressor is compressor 1, and the constant-speed compressors (AC1) are compressors 2 . With types 18HP and 20HP, the INV compressor is compressor 1, and the constant-speed compressors (AC1, AC2) are compressors 2 and 3.
Page 151 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis Compressor thermal protector is activated.(trip only and no alarm) 6 -22 Compressor 1 discharge temperature trouble 6 -23 High-pressure switch activated 6 -24 Reverse phase (or missing phase) detected 6 -24 sensor differential alarm (Only when optional O sensor supplied) 6 -25 Compressor 1 (INV) overcurrent alarm...
Page 152: Way Alarm Codes
2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis E06 Alarm Alarm code Alarm meaning Outdoor unit failed to receive serial communication signals from indoor unit. Alarm conditions Outdoor unit failed to receive serial communication signals from indoor unit. Probable cause (1) The indoor unit power was cut OFF after initial communications were completed.
Page 153 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis E16 Alarm Alarm code Alarm meaning Automatic address setting alarm (too many units) Alarm conditions • The number of indoor units was too many when automatic address setting was performed. • After initial communications were completed, an unrecognized unit was detected. Probable cause (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.
Page 154 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis E25 Alarm Alarm code Alarm meaning Outdoor unit address setting failure (duplication) Alarm conditions 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. Probable cause The unit number is set incorrectly.
Page 155 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis F04, F05, F22 Alarm Alarm code F04, F05, F22 Alarm meaning Compressor 1 discharge temperature sensor trouble, compressor 2 discharge temperature sensor trouble, Compressor 3 discharge temperature sensor trouble. Alarm conditions (1) Discharge temp. of 100°C or higher was detected 20 minutes or more after that compressor stopped operating.
Page 156 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis Check (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.
Page 157 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis F08 Alarm Alarm code Alarm meaning Outdoor air temperature sensor trouble Alarm conditions (1) A/D step is 10 steps or less (short circuit). (2) A/D step is 1014 steps or more (open circuit) Probable cause (1) Sensor malfunction (including connector) (2) PCB malfunction...
Page 158 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis F16 Alarm Alarm code 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.) Alarm conditions • High-pressure SW activated although the detected pressure was lower (3.03 MPa or below) than the high-pressure SW activation pressure: Undershift •...
Page 159 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis Correction (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 sufﬁ cient caution with regard to static electricity.
Page 160 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis H11, H12, H21, H22 Alarm Alarm code H11, H12, H21, H22 Alarm meaning H11: Constant speed compressor 2 overcurrent alarm H12: Constant speed compressor 2 lock current alarm H21: Constant speed compressor 3 overcurrent alarm H22: Constant speed compressor 3 lock current alarm Alarm conditions Hx1: During operation, the compressor current value exceeded 12 A for 30 seconds or longer.
Page 161 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis H03, H13, H23 Alarm Alarm code H03, H13, H23 Alarm meaning Compressor 1 CT sensor disconnected or short-circuit; Compressor 2 CT sensor disconnected or short-circuit; Compressor 3 CT sensor disconnected or short-circuit Alarm conditions Current value at compressor 1 was 18 A or less, and at compressors 2 and 3 was 2 A or less when 2 seconds or more had passed after the compressor began operation and output.
Page 162 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis H06 Alarm Alarm code Alarm meaning Low-pressure switch activated Alarm conditions A report occurs during A/C operation when the low-pressure sensor installed at constant low-pressure parts detects a pressure of 0.05 MPa or less continuously for 2 minutes, or an instantaneous pressure of 0.02 MPa or less.
Page 163 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis H08, H27, H28 Alarm Alarm code H08, H27, H28 Alarm meaning Trouble (open circuit) with the oil sensor (connection) at compressor 1, compressor 2, or compressor 3 Alarm conditions This alarm occurs when a connector connection (pins 1 and 2 for compressor 1, pins 4 and 5 for compressor 2, and pins 7 and 8 for compressor 3) is open.
Page 164 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis H31 Alarm Alarm code Alarm meaning HIC trouble alarm Alarm conditions This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC temperature or other trouble) from the HIC. The HIC judges the current and temperature, and outputs the trouble signal. In general this indicates trouble with the HIC itself.
Page 165 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis L10 Alarm Alarm code Alarm meaning Outdoor unit capacity not set Alarm conditions The outdoor unit capacity has not been set, or the setting is not allowed by the system. Probable cause This alarm occurs because the capacity has not been set.
Page 166 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis P03, P17, P18 Alarm Alarm code P03, P17, P18 Alarm meaning Compressor 1 discharge temperature trouble; Compressor 2 discharge temperature trouble; Compressor 3 discharge temperature trouble Alarm conditions Temperature is 106°C or higher and pre-trip stop has occurred. The alarm occurs when pre-trip stop occurs more than once.
Page 167 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis P04 Alarm Alarm code Alarm meaning High-pressure switch activated. Alarm conditions The operation of the electronic circuit in the high-pressure switch may short-circuit the terminal depending on the pressure. A pressure of 3.3 MPa or above will short-circuit the terminal. Once the terminal is short-circuited, it will remain in that state until the pressure goes below 2.6 MPa.
Page 168 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis P14 Alarm Alarm code Alarm meaning sensor operation (1) It is judged an error whenever the outdoor unit receives the signal “O Alarm Generated” Alarm conditions from the indoor unit. (2) With the indoor unit's EEPROM setting (item code 0B) set to 0001, the EXCT input was shorted.
Page 169 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis P20 Alarm Alarm code Alarm meaning High load alarm Alarm conditions The high pressure increase is not rapid but the alarm occurs when the horsepower down does not meet the anticipated time. Probable cause (1) Forgot to open the valve.
Page 170 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis P29 Alarm Alarm code Alarm meaning Inverter compressor missing phase or lock alarm Alarm conditions This alarm may occur at start, and occurs when missing phase or lock is detected, and when a DCCT failure occurs.
Page 171: Blinking Inspection Display On The Remote Controller
2WAY SYSTEM 5. Blinking Inspection Display Trouble Diagnosis on the Remote Controller Currently the blinking inspection display can be displayed only on the wired remote controller CAUTION and system remote controller. Blinking inspection display (1) (Automatic backup) Alarm code (Blinking inspection display) Alarm meaning Automatic backup is in progress.
Page 172 2WAY SYSTEM 5. Blinking Inspection Display Trouble Diagnosis on the Remote Controller 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.
Page 173: Inspection Of Parts
2WAY SYSTEM 6. Inspection of Parts Trouble Diagnosis (1) High-pressure switch (63PH1, 63PH2, 63PH3) 63PH1 Disconnect the CN033 connector (3P, white) 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 CN031 connector (3P, red) from the outdoor unit control panel.
Page 174: Test Pin
2WAY SYSTEM 7. Test Pin Trouble Diagnosis 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 (CN048, white), then turn the power back ON. •...
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Panasonic U-8ME1E8E Service Manual

CONTROL FUNCTIONS-Outdoor Unit

2 Selecting Outdoor Unit for Operation

CONTROL FUNCTIONS-Indoor Unit

Outdoor Unit Repair Procedures

Outdoor Unit Maintenance Remote Controller

Remote Controller Functions

Trouble Diagnosis

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