Page 1: Service Manual
Order No.SBPAC1307002CE SERVICE MANUAL 2WAY VRF SYSTEM Model No. Outdoor Unit Class 10HP 12HP 14HP 16HP 18HP 20HP Model Name U-8ME1E81 U-10ME1E81 U-12ME1E81 U-14ME1E81 U-16ME1E81 U-18ME1E81 U-20ME1E81 Indoor Unit Class S-22MU1E51 S-28MU1E51 S-36MU1E51 S-45MU1E51 S-56MU1E51 S-60MU1E51 S-73MU1E51 S-90MU1E51 S-106MU1E51 S-140MU1E51...
Page 2: Special Precautions
This product is intended for professional use. THIS SYSTEM. Permission from the power supplier is required when installing the U-8ME1E81 outdoor unit that is connected to a 16 A distribution network. • Do not supply power to the unit until all...
Page 3 When Transporting When Connecting Refrigerant Tubing Be careful when picking up and moving WARNING the indoor and outdoor units. Get a partner to help, and bend your knees • When performing piping work do when lifting to reduce strain on your back. not mix air except for specified Sharp edges or thin aluminum fins on the refrigerant (R410A) in refrigeration...
Page 4 When Servicing Others • Turn the power OFF at the main CAUTION power box (mains), wait at least • Do not touch the air inlet or 10 minutes until it is discharged, the sharp aluminum fins of then open the unit to check or repair the outdoor unit.
Page 5: Check Of Density Limit
Check of Density Limit The standards for minimum room volume are as follows. (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 6: Precautions For Installation Using New Refrigerant
Precautions for Installation Using New Refrigerant 1. Care regarding tubing 1-1. Process tubing ● Material: Use C1220 phosphorous deoxidized copper specified in JIS H3300 “Copper and Copper Alloy Seamless Pipes and Tubes.” For tubes of ø22.22 or larger, use C1220 T-1/2H material or H material, and do not bend the tubes. ●...
Page 7 — CONTENTS — Section 1: CONTROL FUNCTIONS-Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Introduction .
Page 8 Section 4: OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER . . . . . . . . . . . . 4-1 Overview ............. . . 4-2 Functions .
Page 9 2WAY SYSTEM Contents Control Functions-Outdoor Unit 1. CONTROL FUNCTIONS-Outdoor Unit 1. Introduction ............1-2 2.
Page 10: 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 11: Selecting Outdoor Unit For Operation
2WAY SYSTEM 2. Selecting 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 12: 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 10 HP 6 HP 10 HP...
Page 13 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 14 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 15Hz and 95Hz. - When all constant speed compressors mounted in the outdoor unit operate: The inverter compressor can operate within the range shown in the table below.
Page 15 2WAY SYSTEM 3. Compressor Control Control Functions-Outdoor Unit Evaporation temperature area 16.0 13.0 11.0 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 above.
Page 16 2WAY SYSTEM 3. Compressor Control Control Functions - Outdoor Unit - Heating operation The heating capacity is adjusted with this control. It also prevents abnormal high-pressure. Condensation temperature area at heating operation Thermostat OFF Compressor capacity decreases C area Tc_tgt_max. Compressor capacity holds Tc_tgt_min.
Page 17 2WAY SYSTEM 2WAY SYSTEM 3. Compressor Control 3. Compressor Control Control Functions-Outdoor Unit Control Functions-Outdoor Unit 3-7. Protection control 3-7-1. Compressor discharge temperature protection The compressor capacity is controlled according to the table below. *Discharge temperature that is used for this control is the highest temperature among all compressors. Discharge temp.
Page 18 2WAY SYSTEM 2WAY SYSTEM 3. Compressor Control 3. Compressor Control Control Functions-Outdoor Unit Control Functions - Outdoor Unit 3-7-4. Primary current protection of HIC board The fan motor current is included in primary current. PCB is protected from the power consumption increase of fan motor when the heat exchanger is blocked by frost, etc.
Page 19: 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 Refrigerant interception valve Motor operated valve MOV for heat exchanger 1 MOV1 MOV for heat exchanger 2 MOV2...
Page 20 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 21 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 22 2WAY SYSTEM 4. Output of PCB Control Functions - Outdoor Unit 4-7. Refrigerant interception valve [O2*] *O2 valve is the local supply parts. 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.
Page 23 3WAY SYSTEM 2WAY SYSTEM 4. Output of PCB 4. Output of PCB Control Functions 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.
Page 24: Outdoor Fan Control
2WAY SYSTEM 2WAY SYSTEM 5. Outdoor Fan Control 5. Outdoor Fan Control Control Functions-Outdoor Unit Control Functions - Outdoor Unit 5-1. No. of fan motor Outdoor unit capacity 8HP 10HP 12HP 14HP 16HP 18HP 20HP No. of fan motor 1 5-2.
Page 25 3WAY SYSTEM 2WAY SYSTEM 5. Outdoor Fan Control 5. Outdoor Fan Control Control Functions Control Functions-Outdoor Unit 5-2-2. Snow Removal Control (1) Independent control of outdoor unit（control for fan crack prevention） This control is intended to prevent snow from accumulating on stopped fans. When the outdoor unit is stopped, the fan motor is forcibly started by the control for fan crack prevention’s fan mode.
Page 26 2WAY SYSTEM 2WAY SYSTEM 5. Outdoor Fan Control 5. Outdoor Fan Control Control Functions-Outdoor Unit Control Functions - Outdoor Unit 5-2-3. Silent Mode This unit includes 2 types of silent modes. See the table under the section “5-2. Fan mode” for maximum fan mode in silent mode. Selecting the silent mode results in operation that gives priority to reducing noise, because these modes involve restrictions on outdoor unit fan modes, the capacity will be somewhat reduced.
Page 27: 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 28 2WAY SYSTEM 6. Indoor Units Control from the CCU Control Functions - Outdoor Unit 6-2. RAP valve kit The RAP valve kit connection might be required on the Type E1 indoor unit. Mode of Mode of Compressor Thermostat RAP valve kit indoor unit outdoor unit ON/OFF...
Page 29 2WAY SYSTEM 2WAY SYSTEM 6. Indoor Units Control from the CCU 6. Indoor Units Control from the CCU Control Functions-Outdoor Unit Control Functions-Outdoor Unit 6-3-2. Heating mode Indoor unit fan run in the heating mode is stopped from CCU at the following conditions. Discharge air temperature of indoor unit ≤...
Page 30: 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 31 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 32 2WAY SYSTEM 7. Oil Control Control Functions - Outdoor Unit 7-5-2. Simplified flow of system oil recovery control System oil recovery control shall be performed as the flow mentioned below. Normal operation → Time before oil recovery 1 minute stop →...
Page 33 2WAY SYSTEM 7. Oil Control Control Functions-Outdoor Unit 7-6. Indoor unit self oil recovery control This control is carried out regularly when the system is in cooling mode. -During stopped, fan or thermostat OFF condition, indoor unit expansion valve is opened regularly for 1 to 2 min- utes regularly (at an interval of once every 2 hours.) -During the thermostat ON, the indoor unit electronic thermostatic expansion valve is opened about 10 pulses from the current status.
Page 34: Way Valve Adjustment Control
2WAY SYSTEM 2WAY SYSTEM 8. 4-Way Valve Adjustment Control 8. 4-Way Valve Adjustment Control Control Functions-Outdoor Unit Control Functions - Outdoor Unit This control is to change over the 4-way valve appropriately with big differential pressure. 8-1. Start of 4-way valve adjustment control When the microcomputer is initialized immediately after power-ON.
Page 35: Defrost Control
2WAY SYSTEM 2WAY SYSTEM 9. Defrost Control 9. Defrost Control Control Functions-Outdoor Unit 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 in the refrigerant system Outdoor unit cycle defrost 9-2.
Page 36 2WAY SYSTEM 2WAY SYSTEM 9. Defrost Control 9. Defrost Control Control Functions - Outdoor Unit Control Functions-Outdoor Unit 9-4. Reverse Cycle Defrost Reverse cycle defrost is performed in systems where only 1 outdoor unit is connected to the refrigerant system. 9-4-1.
Page 37 2WAY SYSTEM 2WAY SYSTEM 9. Defrost Control 9. Defrost Control Control Functions-Outdoor Unit Control Functions-Outdoor Unit 9-5-2. Simplified Flow of Outdoor Unit Cycle Defrost Whole process Outdoor unit cycle defrost shall be performed as the flow mentioned below. (0) Normal operation (1) Outdoor unit cycle defrost processing time (2) 4-way valve adjustment control (3) Normal operation...
Page 38 2WAY SYSTEM 2WAY SYSTEM 9. Defrost Control 9. Defrost Control Control Functions - Outdoor Unit Control Functions-Outdoor Unit : Evaporator operation : Condenser operation : Stop or shut off the refrigerant E→C : Switching from evaporator operation to condenser operation C→E : Switching from condenser operation to evaporator operation Outdoor unit cycle defrost processing...
Page 39: Upper Current Limitation Mode
2WAY SYSTEM 2WAY SYSTEM 10. Upper Current Limitation Mode 10. Upper Current Limitation Mode Control Functions-Outdoor Unit Control Functions-Outdoor Unit There are 2 types of control; demand control and infinity limit in the upper current limitation mode. The standard value of the limit current is listed in the table below. unit: Amp.
Page 40 2WAY SYSTEM 2WAY SYSTEM 10. Upper Current Limitation Mode 10. Upper Current Limitation Mode Control Functions-Outdoor Unit Control Functions - Outdoor Unit 10-2. Upper Current Limitation Mode Even if the demand control is not performed, upper current limitation is restricted. unit: Amp.
Page 41: 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 5 times, then an alarm occurs.
Page 42 2WAY SYSTEM 2WAY SYSTEM 11. Alarm Information 11. Alarm Information Control Functions-Outdoor Unit Control Functions - Outdoor Unit 11-2. Current Protection 11-2-1. Inverter Compressor and Inverter Fan Motor Alarm Description Compressor 1 primary current detected over-current higher than values. The fan motor current is included in primary current. Compressor 1 secondary current detected over-current higher than values.
Page 43 2WAY SYSTEM 2WAY SYSTEM 11. Alarm Information 11. Alarm Information Control Functions-Outdoor Unit Control Functions-Outdoor Unit 11-3. Pressure Sensor Failure This system contains 2 types of pressure sensors: a high-pressure sensor and a low-pressure sensor. 11-3-1. High-Pressure Sensor Failure 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 for 30 seconds or leaves the valve close.
Page 44 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°C 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 45: Backup Operation
2WAY SYSTEM 2WAY SYSTEM 12. Backup Operation 12. Backup Operation Control Functions-Outdoor Unit 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 46 2WAY SYSTEM 2WAY SYSTEM 12. Backup Operation 12. Backup Operation Control Functions-Outdoor Unit Control Functions - Outdoor Unit Alarm list 2 (Backup operation continues as long as the problem is not solved.) Alarm display Discharge temperature sensor failure for compressor 1 Discharge temperature sensor failure for compressor 2 Gas temperature sensor in heat exchanger 1 Liquid temperature sensor in heat exchanger 1...
Page 47 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 information display If a wired remote controller is present, display blinks during operation.
Page 48 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 49: Other Functions
2WAY SYSTEM 2WAY SYSTEM 13. Other Functions 13. Other Functions Control Functions-Outdoor Unit 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.
Page 50 2WAY SYSTEM 2WAY SYSTEM 13. Other Functions 13. Other Functions Control Functions - Outdoor Unit Control Functions-Outdoor Unit 13-2. Auto Change Over Function It is able to select AUTO mode in each remote 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 51 2WAY SYSTEM 2WAY SYSTEM 13. Other Functions 13. Other Functions Control Functions-Outdoor Unit Control Functions-Outdoor Unit 13-3-3. Outdoor unit PCB LED indications in judgment mode Judgment item LED1 LED2 Remarks Judgment mode Blinking Blinking LED1 and LED2 blink simultaneously. Normal Blinking Blinking LED1 and LED2 blink alternatively.
Page 52: Detailed Settings In Eeprom Of Outdoor Unit
2WAY SYSTEM 3WAY SYSTEM 14. Detailed Settings in EEPROM of Outdoor Unit 14. Detail setting in EEPROM of outdoor unit Control Functions - Outdoor Unit Control Functions Never use the DN code unlisted in the following table. (P) : Factory preset mode Item Setting No.
Page 53 2WAY SYSTEM 3WAY SYSTEM 14. Detailed Settings in EEPROM of Outdoor Unit 14. Detail setting in EEPROM of outdoor unit Control Functions Control Functions-Outdoor Unit Never use the DN code unlisted in the following table. (P) : Factory preset mode Item Setting No.
Page 54 – MEMO – 1 - 46...
Page 55: Section 2: Control Functions-Indoor Unit
2WAY SYSTEM Contents Control Functions - Indoor Unit 2. CONTROL FUNCTIONS-Indoor Unit 1. Room Temperature Control ..........2-2 2.
Page 56: 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 57 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 58: 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 59: 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 60: 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 61: Automatic Heating/Cooling Control
2WAY SYSTEM 6. Automatic Heating/Cooling Control Control Functions - Indoor Unit 6. Automatic Heating/Cooling Control This function is only valid as long as one indoor unit is installed within one refrigerant system or all indoor units are controlled within a group control. When operating in a group control, the sub-indoor units become the same operation mode of the main unit.
Page 62: 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. Discharge air temperature setting (at the time of factory shipment) Discharge air temperature setting Indoor unit type...
Page 63: 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 flap moves to the following position automatically when the indoor unit is stopped. F0 (close): Types K1, K2, T1, D1, U1, Y1, Y2 F5: Models other than the above ②...
Page 64: 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 satisfied in heating mode (thermostat ON). ①...
Page 65: 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 66: 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 Y1, Y2 4-Way Cassette 60×60 4 deg...
Page 67: Section 3: Outdoor Unit Repair Procedures
2WAY SYSTEM Contents Outdoor Unit Repair Procedures 3. OUTDOOR UNIT REPAIR PROCEDURES 1. Removing Panels ............3-2 2.
Page 68: Removing Panels
2WAY SYSTEM 1. Removing Panels Outdoor Unit Repair Procedures Be sure to turn off the power before maintenance. When the power is turned off, CAUTION wait for 5 minutes without any work. Then start working. (1) Front panel removal (Fig. 1) •...
Page 69: 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 70 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 71 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 72: 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 73 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 74: 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 75 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) Type 14HP / 16HP Fig.
Page 76 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 77 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 (SW5) (3P DIP switch) (Blue) on the outdoor unit control PCB is set to No.
Page 78 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 79 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 recovery (for ø7.94mm-dia connector) unit Gas tube service port (for ø7.94mm-dia connector) Refrigerant recovery cylinder Type 8HP / 10HP / 12HP...
Page 80 2WAY SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures Low-pressure outlet port (for ø7.94mm-dia connector) Manifold gauge Refrigerant recovery unit High-pressure outlet port (for ø7.94mm-dia connector) Refrigerant recovery cylinder Liquid tube service port (for ø7.94mm-dia connector) Type 18HP / 20HP Gas tube service port (for ø7.94mm-dia connector) Fig.
Page 81: 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 82 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) Type 14HP / 16HP Fig.
Page 83: 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 84 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 Type 14HP / 16HP (for ø7.94mm-dia connector) Fig.
Page 85: 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 86 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 87 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) Type 14HP / 16HP Fig.
Page 88 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 89 Fig. 13 7-3. Charging Additional Compressor Oil (after replacing compressor) The rated amount of oil is pre-charged in the compressors as given below: Model name Compressor model Q'ty Pre-charged amount of oil (liters) U-8ME1E81 5JD650ZBA22 U-10ME1E81 5JD650ZBA22 5JD420ZCA22 U-12ME1E81 C-SDN523H8B...
Page 90: 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, flathead 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 91 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 92 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) (CN65) from the outdoor unit control PCB of that outdoor unit.
Page 93: Compressor
Display Compressor Not present in model Compressor 1 [H03] (INV compressor) Compressor 2 [H11] [H12] [H13] U-8ME1E81, U-10ME1E81 (Constant-speed compressor 1) U-8ME1E81, U-10ME1E81 Compressor 3 [H21] [H22] [H23] U-12ME1E81, U-14ME1E81 (Constant-speed compressor 2) U-16ME1E81 A judgment is made based on factors that include the following:...
Page 94 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 95 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 96 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 97 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 98 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 99 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-3. Removing 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. Removing Compressors (for all models) (1) After retrieving refrigerant from the system, perform nitrogen gas replacement on the service port of the gas side service valve.
Page 100 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-3-2. Removing Constant-Speed Compressors (for model 12, 14 and 16 horsepower) (1) After retrieving refrigerant from the system, perform nitrogen gas replacement on the service port of the gas side service valve. (2) Remove the insulator that the compressor is surrounded.
Page 101 2WAY SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9-3-3. Removing Constant-Speed Compressors (for model 18 and 20 horsepower) (1) After retrieving refrigerant from the system, perform nitrogen gas replacement on the service port of the gas side service valve. (2) Remove the insulator that the compressor is surrounded. (3) Remove the lid on the compressor terminal plate.
Page 102 – MEMO – 3 - 36...
Page 103: Section 4: Outdoor Unit Maintenance Remote Controller
2WAY SYSTEM Contents Outdoor Unit Maintenance Remote Controller 4. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1. Overview ............. . 4-2 2.
Page 104: Overview
2WAY SYSTEM 1. Overview Outdoor Unit Maintenance Remote Controller OUTDOOR UNIT MAINTENANCE REMOTE [Service Checker Section] CONTROLLER (CZ-RTC2) for 2WAY SYSTEM 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.
Page 105: Functions
2WAY SYSTEM 2. Functions Outdoor Unit Maintenance Remote Controller 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 •...
Page 106: Ordinary Display Controls And Functions
2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller 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...
Page 107 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 108 2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Display (functions) • Use the temperature setting buttons to change the item code. À Á Item code Item Remarks Outdoor unit alarm Alarm code display No. of connected indoor units Quantity Unit Nos.
Page 109 2WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller XX-YY R.C. Â Locations where À Á , and Â 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 110 2WAY SYSTEM 3. Ordinary Display Controls and Functions 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 ( ) and a colon. Display of unit Nos.
Page 111: Monitoring Operations
2WAY SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display the indoor unit and outdoor unit sensor temperatures. <Operating procedure> Press and hold the (CHECK) button and À buttons simultaneously for 4 seconds or longer to engage temperature monitor mode. During temperature monitoring, is illuminates.
Page 112 2WAY SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display of unit No. 1 (main unit) Description Remarks Indoor unit intake temp. (TA) °C Indoor unit heat exchanger temp. E1 (E1) °C — Indoor unit Indoor unit heat exchanger temp. E3 (E3) °C Discharge air temp.
Page 113: 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> À Press and hold the (CHECK) button and button simultaneously for 4 seconds or longer to engage...
Page 114: Mode Settings
2WAY SYSTEM 2WAY SYSTEM 6. Mode Settings 6. Mode Settings Outdoor Unit Maintenance Remote Controller Outdoor Unit Maintenance Remote Controller Setting mode 1 Display of ﬁ rst 3 digits <Operating procedure> Press and hold the (CHECK) button and (VENTILATION) button simultaneously for 4 seconds or longer.
Page 115 2WAY SYSTEM 6. Mode Settings Outdoor Unit Maintenance Remote Controller n Setting mode 2 <Operating procedure> À Press and hold the (CHECK) button, button, and button simultaneously for 4 seconds or longer. Á Press the temperature setting buttons to change the item code.
Page 116 – MEMO – 4 - 14...
Page 117: Section 5: Remote Controller Functions
2WAY SYSTEM Contents Remote Controller Functions 5. REMOTE CONTROLLER FUNCTIONS 1. Simple Settings Function ..........5-2 2.
Page 118: 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 119 2WAY SYSTEM 1. Simple Settings Function Remote Controller Functions <Procedure of CZ-RTC3> 20:30 (THU) START CZ-RTC3 Fig. 2 Select the “Code no.” by pressing the button. Keep pressing the Change the “Code no.” by pressing the buttons simultaneously for 4 or more seconds. button.
Page 120 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 (filter life time) 0003 5,000 hours 0004 10,000 hours 0005 Use the filter clogging sensor.
Page 121 2WAY SYSTEM 1. Simple Settings Function Remote Controller Functions Simple setting items Item code Item Description Filter sign ON time setting Changes the indoor unit filter lifetime when a high-performance filter or other (filter lifetime) optional product is installed. Reduces the filter sign ON time to 1/2 of the standard time (setting at the time of Degree of filter fouling shipping) for cases when filter fouling is more severe than normal.
Page 122 2WAY SYSTEM 1. Simple 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 123 2WAY SYSTEM 1. Simple 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 124: 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 125 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 126 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions <Procedure of CZ-RTC3> 20:30 (THU) START CZ-RTC3 Fig. 5 Select the “Code no.” by pressing the Keep pressing the button. buttons simultaneously for 4 or more seconds. Change the “Code no.” by pressing the The “Maintenance func”...
Page 127 2WAY SYSTEM 2WAY SYSTEM 2. Detailed Settings Function 2. Detailed Settings Function Remote Controller Functions Remote Controller Functions List of Detailed Setting Items Setting data Item code Item Description Description Description 0001 4-Way Cassette (60×60) (U1, Y1, Y2) 0002 2-Way Cassette (L1) 0003 1-Way Cassette (D1) Low Silhouette Ducted (F1, F2)
Page 128 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 Shifts discharge temperature setting 10°C down –009 Shifts discharge temperature setting 9°C down Cooling discharge –008 Shifts discharge temperature setting 8°C down...
Page 129 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. Wired remote controller 0000 Not used.
Page 130 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 filter, oil guard panel, ammonia deodorizing static-pressure filter filter, optical regenerative deodorizing filter...
Page 131 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 132 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 133 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 134 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Selecting the DC fan motor tap (when setting with the remote controller) <Procedure of CZ-RTC2> Stop the system before performing these steps. Press and hold the buttons simultaneously for 4 seconds or longer. If group control is in effect, press the button and select the address (unit No.) of the indoor unit to set.
Page 135 2WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions 3. Detailed Settings Function <Procedure of CZ-RTC3> Stop the system before performing these steps. 1 Keep pressing the buttons simultaneously for 4 or more seconds. Detailed settings 20:30 (THU) The “Maintenance func” screen appears on the LCD display.
Page 136 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 137: Remote Controller Servicing Functions
2WAY SYSTEM 2WAY SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Remote Controller Functions Remote Controller Functions • The remote controller includes a number of servicing functions. Use these as needed for test runs and inspections. CZ-RTC2 Fig.
Page 138 2WAY SYSTEM 2WAY SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Remote Controller Functions Remote Controller Functions <Function of CZ-RTC3> Display of "maintenance function" screen 1 Keep pressing the buttons simultaneously for 4 or more seconds. Maintenance func 20:30 (THU) The “Maintenance func”...
Page 139 2WAY SYSTEM 2WAY SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Remote Controller Functions Remote Controller Functions Test Run Function Operates the unit with the thermostat forced ON. <Procedure of CZ-RTC2> Press and hold the button for 4 seconds or longer.
Page 140 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions n 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 of CZ-RTC2>...
Page 141 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <Procedure of CZ-RTC3> Keep pressing the buttons simultaneously for 4 or more seconds. Sensor info. 20:30 (THU) The “Maintenance func” screen appears on the Unit no. Code no. Data LCD display. 0026 0028 Maintenance func...
Page 142 2WAY SYSTEM 2WAY SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Remote Controller Functions Remote Controller Functions Indoor unit sensors Outdoor unit sensors Unit No.1 Unit No.2 Unit No.3 Room temp. controlled* Discharge temp. 1 (DISCH1) Remote controller temp. Discharge temp.
Page 143: Section 6: Trouble Diagnosis
2WAY SYSTEM 2WAY SYSTEM Contents Contents Trouble Diagnosis Trouble Diagnosis 6. TROUBLE DIAGNOSIS 6. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display ......6-2 2.
Page 144: Contents Of Remote Controller Switch Alarm Display
1. Contents of Remote Controller 2WAY SYSTEM 1. Contents of Remote Controller 2WAY SYSTEM Trouble Diagnosis Switch Alarm Display 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.
Page 145 1. Contents of Remote Controller 2WAY SYSTEM 1. Contents of Remote Controller 2WAY SYSTEM Trouble Diagnosis Switch Alarm Display Trouble Diagnosis Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Thermistor fault Outdoor thermistor is either Compressor intake temp.
Page 146: 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 confirmed in that system;...
Page 147: 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 148 2WAY SYSTEM 3. Remote Controller Servicing Functions Trouble Diagnosis <Procedure of CZ-RTC3> Keep pressing the buttons simultaneously for 4 or more seconds. Sensor info. 20:30 (THU) The “Maintenance func” screen appears on the Unit no. Code no. Data LCD display. 0026 0028 Maintenance func...
Page 149 2WAY SYSTEM 2WAY SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Trouble Diagnosis Trouble Diagnosis Sensor Temperature Relationship Table Location where sensor Sensor address Sensor type Sensor address Sensor type is installed Indoor unit heat exchanger Room temp. controlled* temp.
Page 150: Way Alarm Codes
2WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis With types 8HP and 10HP, only one INV compressor is supplied. With types 12HP, 14HP and 16HP, one INV compressor and one constant-speed compressor (AC1) are supplied. With types 18HP and 20HP, one INV compressor and two constant-speed compressors (AC1, AC2) are supplied.
Page 151 2WAY SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis Compressor thermal protector is activated.(trip only and no alarm) 6 -23 6 -24 Compressor 1 discharge temperature trouble High-pressure switch activated 6 -25 Reverse phase (or missing phase) detected 6 -25 sensor differential alarm (Only when optional O sensor supplied) 6 -26 Compressor 1 (INV) overcurrent alarm...
Page 152 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 (SW3, SW4) 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 30 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 3WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 3WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis F16 Alarm Alarm code Alarm meaning High-pressure sensor malfunction Alarm conditions • High-pressure sensor disconnected or open circuit • High-pressure sensor detected over 3.6MPa continuously for 30 minutes while outdoor units stopped. •...
Page 159 2WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis F17 Alarm Alarm code Alarm meaning Low-pressure sensor trouble Alarm conditions (1) Sensor short circuit (2) Sensor open circuit Probable cause (1) Sensor malfunction (including connector) (2) PCB malfunction Check (1) Measure the sensor resistance.
Page 160 2WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 2WAY Alarm Codes Trouble Diagnosis 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:...
Page 161 2WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis H03, H13, H23 Alarm Alarm code H03, H13, H23 Alarm meaning H03 : Compressor 1 CT sensor disconnected or short-circuit H13 : Compressor 2 CT sensor disconnected or short-circuit H23 : Compressor 3 CT sensor disconnected or short-circuit Alarm conditions Compressor 1:...
Page 162 3WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 3WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis H06 Alarm Alarm code Alarm meaning Abnormal decrease of low-pressure Alarm conditions • Low-pressure sensor detects lower than 0.06MPa continuously for 2 minutes or lower than 0.02MPa for just a moment.
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 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis P03, P17, P18 Alarm Alarm code P03, P17, P18 Alarm meaning P03 : Compressor 1 discharge temperature trouble P17 : Compressor 2 discharge temperature trouble P18 : Compressor 3 discharge temperature trouble Alarm conditions Compressor 1 : Pre-trip stops when the temperature exceeds 106°C.
Page 167 2WAY SYSTEM 3WAY SYSTEM 4. 2WAY Alarm Codes 4. 3WAY Alarm Codes Trouble Diagnosis 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.
Page 168 2WAY SYSTEM 2WAY SYSTEM 4. 2WAY Alarm Codes 4. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis P14 Alarm Alarm code Alarm meaning sensor operation It is judged an error whenever the outdoor unit receives the signal “O Alarm Generated” Alarm conditions from the indoor unit.
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
WARNING 2WAY SYSTEM 5. Blinking Inspection Display Trouble Diagnosis 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 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 And Characteristics Of Parts
2WAY SYSTEM 6. Inspection and Characteristics of Parts Trouble Diagnosis (1) High-Pressure Switch (63PH1, 63PH2, 63PH3), Optional High-Pressure Switch for Renewal (63PH4,63PH5) 63PH1 Disconnect the CN3 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.
Page 174 2WAY SYSTEM 2WAY SYSTEM 6. Inspection and Characteristics of Parts 6. Inspection and Characteristics of Parts Trouble Diagnosis Trouble Diagnosis (4) Coil Resistance of Outdoor Unit Fan Motor unit : ohm DMSBG75SY 10HP 12HP 14HP 16HP 18HP 20HP U - V Resistance U - W (at 20°C)
Page 175: Test Pin
2WAY SYSTEM 2WAY SYSTEM 7. Test Pin 7. Test Pin Trouble Diagnosis 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 (CN22, black), then turn the power back ON. Output is performed in the sequence shown in the table below, for 0.5 seconds each.
Page 176 8. Symptom: Thermostat in OFF continues or 2WAY SYSTEM Mini VRF SYSTEM Trouble Diagnosis cycles OFF & ON too frequently 6. Symptom: Thermostat in OFF continues or Trouble Diagnosis cycles OFF & ON too frequently How to detect abnormality • Abnormality does not occur.
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