ComfortStar CVH-18-2SH Service Manual
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ComfortStar CVH-18-2SH Service Manual

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CondEnsinG units
Revision V 2201
Model Numbers:
CVH-18-2SH, CVH-27-3SH, CVH-36-4SH, CVH-48-5SH
CMZ-18-2Z, CMZ-27-3Z, CMZ-48-4Z, CMZ-54-5Z

Table of Contents

1.
2.
3.
4.
5.
6.
7.
8.
Disassembly Instructions
WARNING
•
Installation MUST conform with local building codes or, in the absence of local
codes, with the National Electrical Code NFPA70/ANSI C1-1993 or current edition
and Canadian Electrical Code Part1 CSA C.22.1.
•
The information contained in the manual is intended for use by a qualified service
technician familiar with safety procedures and equipped with the proper tools and
test instruments
Installation or repairs made by unqualified persons can result in hazards to you
•
and others.
•
Failure to carefully read and follow all instructions in this manual can result in
equipment malfunction, property damage, personal injury and/or death.
Multi outdoor units
sErViCE MAnuAl
1
Multi zone
,

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Summary of Contents for ComfortStar CVH-18-2SH

  • Page 1: Table Of Contents

    Multi outdoor units Multi zone sErViCE MAnuAl CondEnsinG units Revision V 2201 Model Numbers: CVH-18-2SH, CVH-27-3SH, CVH-36-4SH, CVH-48-5SH CMZ-18-2Z, CMZ-27-3Z, CMZ-48-4Z, CMZ-54-5Z Table of Contents Indoor Unit Combination Dimension Of Outdoor Unit Refrigerant Cycle Diagram Installation Details Electronic Function Wiring Diagrams...
  • Page 2 CONTENTS Indoor Unit Combination ........................3 Dimension Of Outdoor Unit ........................6 Refrigerant Cycle Diagram ........................8 Installation Details ..........................12 4.1 Wrench torque sheet for installation ....................12 4.2 Connecting the cables ........................12 4.3 Pipe length and the elevation ......................12 4.4 First-Time Installation ........................

  • Page 3: Indoor Unit Combination

    Indoor Unit Combination Multi DC Outdoor Nominal Suggested Limit Unit capacity Combination 6+12 CMZ-18-2Z 5.2kW None 9+12 12+12 6+12 6+18 CVH-18-2SH 5.2kW None 9+12 12+12 Suggested Combination Multi DC Outdoor Nominal Limit Unit capacity Two units Three units 6+12 6+6+6 6+12+12...
  • Page 4 Suggested Combination Multi DC Outdoor Unit Nominal capacity Limit Two units Three units Four units 6+18 6+6+12 9+9+12 6+6+6+6 6+9+9+18 6+24 6+6+18 9+9+18 6+6+6+9 6+9+9+24 9+18 6+6+24 9+9+24 6+6+6+12 6+9+12+12 9+24 6+9+12 9+12+12 6+6+6+18 6+9+12+18 12+12 6+9+18 9+12+18 6+6+6+24 6+12+12+12 12+18 6+9+24 9+12+24...
  • Page 5 Multi DC Suggested Combination Nominal Outdoor Limit capacity Three units Four units Five units Unit units 9+24 6+6+24 9+12+18 6+6+6+18 6+9+18+30 6+6+6+6+9 6+6+12+12+12 9+30 6+6+6+24 6+12+12+12 6+6+6+6+12 6+6+12+12+18 6+6+30 9+12+24 9+36 6+6+6+30 6+12+12+18 6+6+6+6+18 6+6+12+12+24 6+6+36 9+12+30 12+24 6+6+6+36 6+12+12+24 6+6+6+6+24 6+6+12+18+18 6+9+24...

  • Page 6: Dimension Of Outdoor Unit

    Dimension Of Outdoor Unit Model Unit CMZ-18-2Z inch 35.04 13.46 26.50 38.98 26.10 13.94 CVH-18-2SH 1034 CMZ-27-3Z inch 37.2 16.5 31.9 40.6 26.5 15.9 CVH-27-3SH 1034 CMZ-48-4Z inch 37.2 16.5 31.9 40.6 26.5 15.9...
  • Page 7 Unit Model CVH-48-5SH 1333 1060 CVH-36-4SH inch 37.5 16.3 52.5 41.7 25.0 15.9 CMZ-54-5Z...

  • Page 8: Refrigerant Cycle Diagram

    COOLING High pressure Accumulator HEATING T2B-C switch T5 Discharge Low pressure temp. sensor switch Compressor 3.2 Refrigeration circuit drawing of CVH-18-2SH INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B LIQUID VALVE B CAPILLARY TUBE Condenser temp. sensor HEAT EXCHANGE...
  • Page 9 3.3 Refrigeration circuit drawing of CVH-27-3SH INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B LIQUID VALVE B CAPILLARY TUBE EXV C LIQUID VALVE C Condenser temp. sensor HEAT EXCHANGE HEAT T1 Room T4 Ambient (EVAPORATOR) EXCHANGE temp. sensor temp. sensor (CONDENSER) T2B-A Evaporator...
  • Page 10 3.5 Refrigeration circuit drawing of CVH-36-4SH INDOOR OUTDOOR EXV A LIQUID VALVE A Radiator for IPM EXV B LIQUID VALVE B EXV F EXV C LIQUID VALVE C Condenser EXV D temp. sensor LIQUID VALVE D HEAT EXCHANGE HEAT T1 Room T4 Ambient (EVAPORATOR) EXCHANGE...
  • Page 11 3.8 Refrigeration circuit drawing of CMZ-54-5Z INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B LIQUID VALVE B Radiator for IPM EXV F EXV C LIQUID VALVE C EXV D LIQUID VALVE D Condenser temp. sensor EXV E LIQUID VALVE E HEAT EXCHANGE HEAT...

  • Page 12: Installation Details

    Caution: Installation Details ● Refrigerant pipe diameter different 4.1 Wrench torque sheet for installation according to indoor unit to be connected. When using the extension pipe, refer to the Outside diameter Torque Additional tightening torque tables below. inch N.cm N.cm ●...
  • Page 13 1. Air Purging Using the Vacuum Pump 2. Adding refrigerant if the pipe length exceeds chargeless pipe length Procedure: 1) Connect the charge hose to the charging cylinder and open the 2-way and 3-way valves. 1. Completely tighten the flare nuts on the With the charge hose you disconnected from the indoor and outdoor units.

  • Page 14: Adding Refrigerant After Long-Term System Operation

    4.5 Adding Refrigerant after Long-Term System Operation Procedure Procedure 1). Confirm that both the 2-way and 3-way valves are set to the opened position 1) Connect the charge hose to the 3-way service Remove the valve stem caps and confirm that the port and open the 2-way and 3-way valve.

  • Page 15: Evacuation After Servicing The Outdoor Unit Refrigeration Circuit

    and securely tighten the cap of the 3 way valve. 4.7 Evacuation after servicing the outdoor unit refrigeration circuit 1. Evacuation of the complete refrigeration circuit, Indoor and outdoor unit. 1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and 3-way valves are set to the closed position.
  • Page 16 Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge. 2). Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be careful of the liquid refrigerant).

  • Page 17: Electronic Function

    5.3.3 Fan Speed Malfunction 5. Electronic Function ---- If outdoor fan speed is lower than 100RPM higher than 2400RPM for 60 seconds or more, 5.1 Abbreviation the unit stops and LED displays failure code. T1: Indoor ambient temperature 5.3.4 Inverter Module Protection. T2: Middle indoor heat exchanger coil ---- The inverter protection module ensures that temperature...
  • Page 18 and shutdown current CoolT4Zone5I ℃ HeatT4Zone4I T4≥15℃ Heating current limit value HeatT4Zone3I 14℃＞T4≥10℃ Heating current limit value HeatT4Zone2I 9℃＞T4≥6℃ CoolT4Zone4I Heating current limit value HeatT4Zone1I 5℃＞T4 Heating current limit value HeatStopI Heating stop protection current value CoolT4Zone3I For CVH-36-4SH, CMZ-54-5Z, CVH-48-5SH, T4/°C HeatT4Zone4I CoolT4Zone2I...

  • Page 19: Control And Functions

    When the compressor is off and T4 is lower than - value 35℃ for 10 seconds, the unit stops and displays HeatStopI Heating stop protection current value “LP” or “PC0L” When the compressor is on and T4 remains lower 5.3.7 Indoor / Outdoor Units Communication than -40℃...
  • Page 20 … COOL Frequency (Hz) L_F2 L_F1 L_F2 … _F24 Note: The final result is an integer. Amendatory … Then modify it according to a T2 average capacity … demand. (correction): Note:Average value of T2：Sum T2 value of all The maximum running frequency is adjusted indoor units)/ (indoor units number according to the outdoor ambient temperature ℃...
  • Page 21 4) If the compressor cumulative running time reaches 120 minutes and T3<-15℃. ℃ 5) If the air conditioner is shut down from heating Standby mode, it will enter defrost if any of the following conditions are met (this condition can be shielded Fmax=T4FREHEATMAX1 by parameters): Fmax=T4FREHEATMAX2...
  • Page 22 When T3≥38 ℃ (100.4 ℉) or when T4≥15 ℃ (59 4-way valve defrosting Defrosting over ℉), the outdoor fan chooses a speed according compressor to T4 again. Max 10 minutes frequency Cool-F9 frequency Compressor stops TimeA 10S 30S Indoor fan Anti-cold control Exit low ambient cooling mode...
  • Page 23 run, otherwise the initial cooling opening is run, and the internal machine is not connected. deal with 7k unit). 2.3 Main EXV action: When the compressor is off, the main EXV keeps the opening degree when Breeze fan speed the compressor is turned off within the first 90 seconds.
  • Page 24 The initial open angle of the EXV depends on the size of the indoor model. The adjustment range is 150-350p. When the unit has been running for 3 minutes, the outdoor unit receives the indoor units' indoor units' capacity demand and T2 information and then calculates their average.

  • Page 25: Wiring Diagrams

    Wiring Diagrams 6.1 Wiring diagram of 1 drive 2 outdoor CVH-18-2SH...
  • Page 26 CMZ-18-2Z 5(8)
  • Page 27 6.2 Wiring diagram of 1 drive 3 outdoor CMZ-27-3Z, CVH-27-3SH...
  • Page 28 6.3 Wiring diagram of 1 drive 4 outdoor CMZ-48-4Z...
  • Page 29 CVH-36-4SH 16022000036850 MAIN CONTRO L BOARD ELECTRONIC EX PANSIVE VALVE HE AT_D CHASSIS HE ATER HE AT_Y REVERSING VALVE COM P TOP COM P. TOP OLP TEM P. SENSOR...
  • Page 30 6.4 Wiring diagram of 1 drive 5 outdoor CVH-48-5SH CMZ-54-5Z 16022000036851 MAIN CONTRO L BOARD ELECTRONIC EX PANSIVE VALVE HEAT_D CHASSIS HEATER HEAT_Y REVERSING VALVE COMP TOP COMP. TOP OLP TEMP. SENSOR...
  • Page 31 PCB board of CVH-18-2SH, CMZ-27-3Z, CVH-27-3SH, CMZ-48-4Z Name Meaning T3: condenser temperature sensor T3/T4 CN17 T4: outdoor ambient temperature sensor connect to discharge sensor TESTPORT CN26 connect to DR board CN1 LOW/HIGH CN14 Red: low pressure protect...
  • Page 32 Yellow: high pressure protect Comp Top CN12 compressor top temperature sensor L-OUT L-OUT connect to IPM board CN4 N-OUT N-OUT connect to IPM board CN5 CN32 CN32 connect to DR board CN5 CN33 CN33 connect to DR board CN5 N-in N_in: connect to N-line (208-230V AC input) HEAT2 CN8/CN9...
  • Page 33 IPM board of CVH-18-2SH, CMZ-27-3Z, CVH-27-3SH, CMZ-48-4Z Name Meaning connect to main board L-Out connect to main board N-Out CN_Reactor CN2/CN3 connect to reactor CN_COMP CN_COMP connect to compressor connect to main board CN21 AN_DC CN14 connect to outdoor DC fan...
  • Page 34 PCB board of CMZ-18-2Z Name Meaning CN11 L_in: connect to N-line (208-230V AC input) Power Supply CN12 N_in: connect to L-line (208-230V AC input) connect to Electric Expansion Valve A Electronic connect to Electric Expansion Valve B Expansion CN34 connect to Electric Expansion Valve C valve connect to Electric Expansion Valve D CN10...
  • Page 35 connect to pipe temp. sensor T3, ambient temp. sensor T4, exhaust T3 T4 TP CN26 temp. sensor TP OLP TEMP. CN30 connect to compressor top temp. sensor (5VDC Pulse wave) SENSOR connect to high and low pressure swtich(pin1-pin2&pin3-pin4:5VDC H-PRO,L-RPO CN29 pulse wave) TESTPORT CN24...
  • Page 36 PCB Board of CVH-48-5SH, CVH-36-4SH& CMZ-54-5Z...
  • Page 37 Name Meaning L1_in: connect to L1-line (230V AC input) Power Supply L2_in: connect to L2-line (230V AC input) Exhaust temp. sensor TP TESTPORT CN35 used for testing HEAT1 CN19/CN20 connect to chassis heater, 208-230V AC when is ON HEAT2 CN24/CN25 connect to compressor heater, 208-230V AC when is ON CN17/ 4-WAY...
  • Page 38 IPM board of CVH-48-5SH , CVH-36-4SH& CMZ-54-5Z...
  • Page 39 Name Meaning connect to main board L-Out Power Supply connect to main board N-Out Connect to main PCB CN6 FAN_DC FAN_1/FAN_2 connect to outdoor DC fan 1& DC fan 2 CN_COMP Connect to compressor...

  • Page 40: Troubleshooting

    Troubleshooting 7.1Safety Electricity is stored in capacitors, even when the power supply is shut off. Do not forget to discharge the electricity in the capacitors. The value of resistance is about 1500 ohm to 2000 ohm Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) Bulb (25-40W) The voltage in P3 and P4 in outdoor PCB is high voltage about 310V The voltage in P5 and P6 in outdoor PCB is high voltage about 310V...

  • Page 41: Indoor Unit Error Display

    7.2 Indoor Unit Error Display Timer Operation lamp Display LED STATUS Error lamp —— ★ 1 time 00/EH Indoor unit EEPROM parameter error EL 01 ★ 2 times Communication malfunction between indoor and outdoor units ★ 4 times —— EH 03 Indoor fan speed malfunction ★...
  • Page 42 Display Remark Number Presses Displays running frequency, running state, or malfunction code Normal display Quantity of indoor units with working connection Actual data Display Number of indoor unit Outdoor unit running mode code Off: 0,Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4. Forced defrost:A Indoor unit A capacity Indoor unit B capacity...
  • Page 43 units' amendatory capacity demand The frequency after the frequency limit The frequency sending to compressor control chip Indoor unit A evaporator outlet temperature (T Indoor unit B evaporator outlet temperature (T ℃ If the temperature is lower than -9 , the digital display shows “-9.” If the Indoor unit C evaporator outlet temperature ℃...
  • Page 44 F indoor unit capacity F indoor unit capacity demand code F indoor unit evaporator outlet temperature (T F indoor unit room temperature (T F indoor unit evaporator temperature (T EXV open angle for F indoor unit Reason of stop EVI valve target angle(only for CVH-48- Actual data/4.
  • Page 45 Indoor unit A capacity demand code Indoor unit B capacity demand code Norm code*HP Indoor unit C capacity demand code (9K: 1HP,12K: 1.2HP,18K: 1.5HP,24K:2.0HP) Indoor unit D capacity demand code Indoor unit E capacity demand code Outdoor unit amendatory capacity demand code The frequency corresponding to the total indoor units' amendatory capacity demand The frequency after the frequency limit...
  • Page 46 “E6” (each appears for 0.5s.) • In protection or malfunction, the LED displays an error code or protection code. “PH”, “RO”, “LC”, ”E6” are not suitable for CMZ-18-2Z, CVH-18-2SH, CMZ-27-3Z, CVH-27-3SH, CMZ- 48-4Z...
  • Page 47 7.3.3 Outdoor unit error display For other models, Display LED STATUS New indoor Error Outdoor unit EEPROM parameter error Communication malfunction between indoor and outdoor units Communication malfunction between IPM board and outdoor main control —— board Outdoor temperature sensor (coil sensor T3,ambient sensor T4, Compressor F2/F1/F3/F6 discharge sensor T5、indoor coil outlet pipe sensor T2B) malfunction Over-voltage or under-voltage protection...
  • Page 48 CMZ-18-2Z, CVH-18-2SH, CMZ-27-3Z, CVH-27-3SH, CMZ-48-4Z, CVH-36-4SH, CMZ-54-5Z Display LED STATUS EC 51 Outdoor EEPROM malfunction EL 01 Indoor / outdoor units communication error PC 40 Communication malfunction between IPM board and outdoor main board PC 08 Outdoor overcurrent protection PC 10...

  • Page 49: Diagnosis And Solution

    7.4 Diagnosis and Solution 7.4.1 Indoor unit trouble shooting 7.4.1.1 Indoor unit EEPROM parameter error diagnosis and solution. Indoor or outdoor PCB main chip does not receive feedback Malfunction conditions from EEPROM chip. Potential causes Installation mistake ● Faulty PCB ●...
  • Page 50 7.4.1.2 Communication malfunction between indoor and outdoor units diagnosis and solution. Malfunction conditions If indoor unit does not receive the feedback from outdoor unit during 120 seconds. Potential causes ● Wiring mistake ● Faulty indoor or outdoor PCB Trouble shooting:...
  • Page 51 Indoor / outdoor units communication error Start: Power off , then Power on the A/C by the Breaker. (reconnect the power wire). Is it still displaying the error code? Check wiring on the outdoor and indoor terminal follow the wiring diagram. Is all Reconnect the wiring connecting correctly? Reconnect the wiring...
  • Page 52 Pic 1: Use a multimeter to test the DC voltage between 2(old: L2) port and S port of outdoor unit. The red pin of multimeter connects with 2 (old: L2) port while the black pin is for S port. When AC is normal running, the voltage will move alternately between positive value and negative value.
  • Page 53 Pic 2: IPM (for 2 zone/ 3-zone) Operating Standby...
  • Page 54 Pic 2: IPM (for 4 zone&5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby.
  • Page 55 PIC 4: Check point button, press 1 time for check how many indoor units are connected. 7.4.1.3 Zero-crossing signal detection error diagnosis and solution. Malfunction conditions When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal. Potential causes ●...
  • Page 56 7.4.1.4 Indoor fan speed malfunction diagnosis and solution. Malfunction conditions When indoor fan speed is too low (300RPM) for a certain period of time, the unit ceases operation and the LED displays a failure code. Potential causes Wiring mistake ● Faulty fan assembly ●...
  • Page 57 Index 1: 1: Indoor AC fan motor Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V (208~240V power supply)or 50V(115V power supply), the PCB must have problems and need to be replaced.
  • Page 58 7.4.1.5 Temperature sensor malfunction diagnosis and solution. Malfunction conditions If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays a failure. Potential causes Wiring mistake ● Faulty sensor ● Faulty PCB ● Trouble shooting: Check the connections between temperature Correct the connections.
  • Page 59 7.4.1.6 Inverter module (IPM) malfunction diagnosis and solution. Malfunction conditions When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show “P6” and AC will turn off. Potential causes ● Wiring mistake ● IPM malfunction ●...
  • Page 60 IPM module protection Check whether the voltage range Check whether the input Regulate it to correct, then of P-N on IPM module is normal? power supply is correct? check whether the system DC277-356V for 18-27KBtu/h; 208-230V, 1N, 60Hz can work normally? DC277-410V for 36K-48KBtu/h Check whether the connecting line between main board and...
  • Page 61 7.4.1.7 Over-voltage or under-voltage protection diagnosis and solution. Outdoor unit low AC voltage protection Outdoor unit main control board DC bus high voltage protection Outdoor unit main control board DC bus high voltage protection /341 MCE error Voltage protection Check the voltage of outdoor unit power supply, whether the voltage Check the power supply...
  • Page 62 7.4.1.8 Compressor drive malfunction diagnosis and solution The trouble shooting is same with one of IPM module protection. Water-level alarm malfunction 7.4.1.9 diagnosis and solution Malfunction conditions If the sampling voltage is not 5V, the LED will display the failure code.
  • Page 63 7.4.1.10 Indoor units mode conflict Error Code P5(old model) or - -(new model) Malfunction conditions The indoor units cannot work cooling mode and heating at same time. Heating mode has a priority. Potential causes ● Suppose Indoor unit A working in cooling mode or fan mode, and indoor unit B is set to heating mode, then A will change to off and B will work in heating mode.
  • Page 64 7.4.1.11 High temperature protection of IPM board diagnosis and solution High temperature protection of IPM High temperature protection of IPM board board Check whether the radiator is Check whether the radiator is Fix the radiator well Fix the radiator well fixed well ? fixed well ? Check whether electronic...
  • Page 65 Communication error between the indoor PCB and display board 7.4.1.12 Power off, then restart the unit after 2 minutes. Does a problem remain? The unit is operating normally Check the wirings and connections Are all the Ensure proper connections connections good? Replace the indoor main PCB Does the error still The problem is solved...
  • Page 66 7.4.1.13 Refrigerant Leakage Detection Power off, then restart the unit 2 minutes later. Does a problem remain? Put your hands in front of the indoor air outlet. Is there cool air blowing out from Check the T2 sensor. indoor air outlet? Is it securely Replace the attached?
  • Page 67 7.4.1.14 Communication malfunction between indoor two chips Shut off the power supply and turn it on 2 minutes later. Is it still displaying The unit is operating normally. the error code? Replace the indoor main PCB.
  • Page 68 7.4.2 Outdoor unit trouble shooting 7.4.2.1 E0/ EC 51 (Outdoor unit EEPROM parameter error) diagnosis and solution Error Code E0/ EC 51 Malfunction PCB main chip does not receive feedback from EEPROM chip conditions Potential causes ● Installation mistake Faulty PCB ●...
  • Page 69 7.4.2.2 E2/ EL 01 (Communication malfunction between indoor and outdoor units) diagnosis and solution. Error Code E2/ EL 01 Malfunction Indoor unit does not receive the feedback from outdoor unit during 120 seconds or outdoor unit does not receive the conditions feedback from any one indoor unit during 180 seconds.
  • Page 70 Communication malfunction between indoor and outdoor units Start: Power off , then Power on the A/C by the Breaker. (reconnect the power wire). Is it still displaying the error code? Check wiring on the outdoor and indoor terminal follow the wiring diagram. Is all Reconnect the wiring connecting correctly? Reconnect the wiring...
  • Page 71 Pic 1: Use a multimeter to test the DC voltage between 2(old: L2) port and 3 port of outdoor unit. The red pin of multimeter connects with 2 (old: L2) port while the black pin is for 3 port. When AC is normal running, the voltage will move alternately between positive value and negative value.
  • Page 72 Pic 2: IPM board (for 2 zone/ 3-zone) Operating Standby...
  • Page 73 Pic 2: IPM (for 4 zone & 5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby.
  • Page 74 PIC 4: Check point button, press 1 time for check how many indoor units are connected.
  • Page 75 7.4.2.3 E3/ PC 40 (Communication malfunction between IPM board and outdoor main control board) diagnosis Error Code E3/ PC 40 Malfunction PCB main chip does not receive feedback from IPM module during 60 seconds. conditions Potential causes ● Wiring mistake ●...
  • Page 76 Remark: Use a multimeter to test the DC voltage between black pin and white pin of signal wire The normal value should be around 5V. Use a multimeter to test the DC voltage between black pin and red pin of signal wire. The normal value should be around 12V.
  • Page 77 7.4.2.4 E4/EC 50 (Outdoor temperature sensor (coil sensor T3,ambient sensor T4, Compressor discharge sensor T5、indoor coil outlet pipe sensor T2B) malfunction) diagnosis and solution F1/F2/F3/F4/F5 (No.A,B,C,D,E Indoor unit coil outlet temp. sensor malfunction) diagnosis and solution. Outdoor room temperature sensor T4 is in open circuit or has short circuited(EC 53) Compressor discharge temperature sensor T5 is in open circuit or has short circuited(EC 54) Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited(EC 56) Error Code...
  • Page 78 7.4.2.5 E5/ PC 10/PC 11/PC 12 (Over-voltage or under-voltage protection) diagnosis and solution. Error Code E5/ PC 10/PC 11/PC 12 Malfunction conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. Potential causes ● Power supply problems. ●...
  • Page 79 IPM board (for 2-zone /3-zone) Bridge rectifier (for 2-zone/3-zone) Remark: Measure the DC voltage between + and - port. The normal value should be 190V~250V. P(or E1/E2/E3)-N(GND) (for 2-zone/3-zone) Bridge rectifier (for 2-zone/3-zone) IPM Module (for 2-zone/3-zone)
  • Page 80 IPM board (for 4-zone)
  • Page 81 Bridge rectifier (for 5-zone) Remark: Measure the DC voltage between + and - port. The normal value should be 190V~250V. IPM board (for 5-zone) IPM Module (for 5-zone)
  • Page 82 7.4.2.6 E6/ PC 0F (PFC module protection) error diagnosis and solution. Error Code E6/ PC 0F Malfunction When the voltage signal that PFC sends to main control board is abnormal, the display LED will show “E6” and AC will turn conditions off.
  • Page 83 PFC module protection Check whether the connecting line between Connect it tightly, check main board and the PFC normal or not module(IPM module) is connected tightly Check whether the voltage range of P-N on IPM Replace the outdoor main board module is normal? DC277- 356V for 18-27KBtu/h;...
  • Page 84 Inductance Two ports of the inductance...
  • Page 85 7.4.2.7 E8/ EC 07 (Outdoor fan speed malfunction)/ EC 71(Over current failure of outdoor DC fan motor) diagnosis and solution Error Code E8/ EC 07/ EC 71 Malfunction conditions When outdoor fan speed keeps too low (300RPM) or too high(2400RPM) for certain time, the unit will stop and the LED will display the failure.
  • Page 86 Index 1: 1. DC fan motor(control chip is inside fan motor)  Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must have problems and need to be replaced.
  • Page 88 2. DC Fan Motor (control chip is in PCB)  Release the UVW connector. Measure the resistance of U-V, U-W, and V-W. If the resistances are not equal to each other, the fan motor may be experiencing problems and need to be replaced.
  • Page 89 7.4.2.8 P1/PC 30 (High pressure protection) diagnosis and solution. Error Code P1/PC 30 Malfunction conditions If the sampling voltage is not 5V, the LED will display the failure. Potential causes ● Wiring mistake ● Faulty over load protector ● System block ●...
  • Page 90 High pressure protection High pressure protection Whether the wiring Whether the wiring between the high pressure between the high pressure switch and main control switch and main control Connect it well Connect it well board is connected well or board is connected well or correctly correctly Whether the high...
  • Page 92 7.4.2.9 P2/PC 31 (Low pressure protection) diagnosis and solution. Error Code P2/PC 31 Malfunction conditions If the sampling voltage is not 5V, the LED will display the failure. Potential causes ● Wiring mistake ● Faulty over load protector ● System block ●...
  • Page 93 Low pressure protection Low pressure protection Whether the wiring Whether the wiring between the low pressure between the low pressure protector and main control protector and main control Connect it well Connect it well board is connected well or board is connected well or correctly correctly Whether the low...
  • Page 95 7.4.2.10 P3/PC 08 (Current overload protection)/ PC 44(Outdoor unit zero speed protection)/PC 46(Compressor speed has been out of control)/PC 49(Compressor overcurrent failure) diagnosis and solution. Error Code P3/PC 08/PC 44/PC 46/PC 49 Malfunction conditions If the outdoor current exceeds the current limit value, the LED will display the failure.
  • Page 96 Current protection of compressor Judge 1: Check whether the input current of the power supply wire is more than 15A(18K) (For 27K&hyper heat 18K, it is Replace outdoor main board 18.5A.For 36K&hyper heat 27K, it is 22.5A.For 48K&hyper heat 36K, it is 28A) Check whether the refrigerant system is ok...
  • Page 98 7.4.2.11 P4/PC 06 (Temperature protection of compressor discharge) diagnosis and solution. Error Code P4/PC 06 Malfunction conditions When the compressor discharge temperature(T5) is more than 115℃ for 10 seconds, the compressor will stop restart till T5 is less than 90℃. Potential causes ●...
  • Page 99 Temperature protection of Temperature protection of compressor discharge compressor discharge Check whether the Check whether the Check whether the Check whether the compressor discharge temp. is compressor discharge temp. is Stop leaking and add refrigerant Stop leaking and add refrigerant refrigerant is leak refrigerant is leak more than 115°C ?
  • Page 100 High temperature protection of High temperature protection of condenser condenser Check the connection Check the connection between temperature Correct the connection between temperature Correct the connection sensor and PCB. sensor and PCB. Check whether the Check whether the condenser temperature is condenser temperature is Check whether the Check whether the...
  • Page 101 ● Faulty outdoor PCB Trouble shooting:...
  • Page 102 IPM module protection Check whether the voltage range Check whether the input Regulate it to correct, then of P-N on IPM module is normal? power supply is correct? check whether the system DC277-356V for 18-27KBtu/h; 208-230V, 1N, 60Hz can work normally? DC277-410V for 36-48KBtu/h Check whether the connecting line between main board and...
  • Page 103 7.4. 2.14 . High temperature protection of compressor top(IDU P2/ODU P0/PC 02) Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes Faulty overload protector ● Wiring mistake ● System leakage or block ●...
  • Page 104 7.4. 2.15 Lack phase failure of outdoor DC fan motor(EC 72) Power off,then restart the unit The unit operates 2 minutes later.Is it still normally displaying the error code Check the wiring of fan motor.Are all the connections Correct the connections good? Check whether the three- phase resistance of the fan is...
  • Page 105 7.4. 2.16 Outdoor compressor lack phase protection(PC43) Power off,then restart the unit The unit operates 2 minutes later.Is it still normally displaying the error code Check both ends of compressor connecting Correct the connections line .Are all the connections good? Check whether the three- phase resistance of the Replace the compressor...
  • Page 106 7.4. 2.18 The cooling operation or heating operation does not operate. Potential causes ● Faulty 4-way valve Check of 4-way, please refer to part 5 in 9.5 Trouble Criterion Of Main Parts. 7.4.2.19 When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit get warm.
  • Page 107 7.4.2.17 Communication malfunction between adapter board and outdoor main control board(ODU Ed) Malfunction decision If outdoor PCB does not receive feedback from adapter board. conditions Supposed causes Wiring mistake ● Faulty PCB ● Power off, then restart the unit after 3 minutes.

  • Page 108: Trouble Criterion Of Main Parts

    7.5 Trouble Criterion of Main Parts. 1.Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 109 Appendix 1 Temperature Sensor Resistance Value Table (℃--K) K Ohm K Ohm K Ohm K Ohm ℃ ℃ ℃ ℃ 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5000 2.19073 0.59386 96.3423 10.9731 2.11241 0.57683 89.5865 10.4736 2.03732 0.56038 84.2190 10.000 1.96532...
  • Page 111 Appendix 2 Unit: ℃---K Discharge temp. sensor table 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492 455.9 59.98 12.21 3.392 430.5 57.37 11.79 3.296 406.7 54.89 11.38 3.203 384.3 52.53 10.99 3.113 363.3 50.28 10.61 3.025 343.6 48.14 10.25 2.941...
  • Page 112 Appendix 3: 10 11 12 13 14 15 16 17 18 19 20 21 22 ℃ 48 50 52 54 56 58 60 62 64 66 68 70 72 ℉ 23 24 25 26 27 28 29 30 31 32 33 34 35 ℃...
  • Page 113 3. IPM continuity check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. Normal Normal resistance Digital tester Digital tester resistance value...
  • Page 114 Position Resistance Value YDK53- YDK70-6FB YDK180-8GB YSK27-4G YSK68-4B YDK45-6B YSK25-6L 6FB(B) 56Ω±8% 24.5Ω±8% 317Ω±8% 145Ω±8% 345Ω±8% 627Ω±8% (20 88.5Ω±8% Black - (20℃) (20℃) (20℃) (20℃) (20℃) ℃) (20℃) 76Ω±8% 19Ω±8% (20 252Ω±8% 88Ω±8% (20 150Ω±8% 374.3Ω±8% 138Ω±8% (20 Red - Yellow (20℃) ℃)
  • Page 115 2 Turn off the power, use a digital tester to measure the resistance. The value should be 1.8~2.5 KΩ. 6.EXV check Disconnect the connectors.
  • Page 116 Red Brown Blue Orange Yellow White Resistance to EXV coil Color of lead wire Normal Value Red- Blue Red - Yellow About 50Ω Brown-Orange Brown-White...

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