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ACIQ ES-18Z-M2B Service Manual

Standard & platinum multi-zone condenser
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STANDARD & PLATINUM MULTI-ZONE CONDENSER
SERVICE MANUAL
Models Covered:
ES-18Z-M2B
ES-27Z-M3B
ES-36Z-M4B
ES-48Z-M5B
ES-55Z-M5B
ACiQ-18Z-HH-M2B
ACiQ-27Z-HH-M3B
ACiQ-36Z-HH-M4B
ACiQ-48Z-HH-M5B
ACiQ-55Z-HH-M5B
VERSION DATE: 05-13-24

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Summary of Contents for ACIQ ES-18Z-M2B

  • Page 1 STANDARD & PLATINUM MULTI-ZONE CONDENSER SERVICE MANUAL Models Covered: ES-18Z-M2B ES-27Z-M3B ES-36Z-M4B ES-48Z-M5B ES-55Z-M5B ACiQ-18Z-HH-M2B ACiQ-27Z-HH-M3B ACiQ-36Z-HH-M4B ACiQ-48Z-HH-M5B ACiQ-55Z-HH-M5B VERSION DATE: 05-13-24...

  • Page 2: Table Of Contents

    Multi-zone outdoor units Multi-zone SERVICE MANUAL CONDENSING UNITS Revision Q: ODMFI-E-2311 Model Numbers: ACIQ-18Z-HH-M2B ES-18Z-M2B ACIQ-27Z-HH-M3B ES-27Z-M3B ACIQ-36Z-HH-M4B ES-36Z-M4B ACIQ-48Z-HH-M5B ES-48Z-M5B ACIQ-55Z-HH-M5B ES-55Z-M5B Table of Contents Indoor Unit Combination Dimension Of Outdoor Unit Refrigerant Cycle Diagram Installation Details Electronic Function...
  • Page 3 7.1 Safety ................................50 7.2 Indoor Unit Error Display........................... 51 7.3 Outdoor Unit Display ............................54 7.4 Diagnosis and Solution ............................62 7.5 Trouble Criterion of Main Parts........................127 Disassembly Instructions ............................137 ➢ ES-18Z-M2B (WX430 metal plate) ....................137...
  • Page 4 ➢ ACIQ-18Z-HH-M2B, ES-27Z-M3B, ACIQ-27Z-HH-M3B, ES-36Z-M4B (WD30 metal plate) ..............................144 ➢ ACIQ-48Z-HH-M5B, ACIQ-36Z-HH-M4B, ES-48Z-M5B, ES-55Z-M5B, ACIQ-55Z-HH-M5B (WE30 metal plate) ..........................153...

  • Page 5: Indoor Unit Combination

    Indoor Unit Combination Suggested Combination Multi DC Outdoor Unit Nominal capacity Available Indoor One unit Two units Wall mounted(AG/EP)：6K/9K/12K/18K； ES-18Z-M2B 5.2kW 9+12 Cassette/Duct/Console：6K/9K/12K/18K； 6+12 12+12 9+12 9+18 Wall mounted(AG/EP)：9K/12K/18K； ACIQ-18Z-HH-M2B 5.2kW 6+12 12+12 Cassette/Duct/Console：9K/12K/18K； 6+18 12+18 18+18 Suggested Combination Multi DC...
  • Page 6 Suggested Combination Multi DC Outdoor Nominal Available Indoor Unit capacity Three units Four units unit units 6+6+6 6+18+24 6+6+6+6 6+9+9+12 6+12 6+6+9 9+9+9 6+6+6+9 6+9+9+18 6+18 6+6+12 9+9+12 6+6+6+12 6+9+9+24 6+24 6+6+18 9+9+18 6+6+6+18 6+9+12+18 6+6+24 9+9+24 6+6+6+24 6+12+12+12 Wall mounted(AG/EP)： 6K/9K/12K/18K/24K；...
  • Page 7 12+12+24 6+6+18+18 6+12+18+18 9+12+18+18 24+24 9+9+9 12+18+18 6+6+18+24 6+12+18+24 9+18+18+18 9+9+12 12+18+24 6+9+9+9 6+18+18+18 12+12+12+12 9+9+18 12+24+24 6+9+9+12 9+9+9+9 12+12+12+18 ACIQ-36- 10.5kW HH-M4B 9+9+24 18+18+18 6+9+9+18 9+9+9+12 12+12+12+24 6+9+9+24 9+9+9+18 12+12+18+18 6+9+12+12 9+9+9+24 6+18 6+6+24 9+9+24 6+6+6+18 6+9+9+24 9+9+9+24 6+24...
  • Page 8 Suggested Combination Multi DC Nominal Outdoor Available Indoor capacity Three units Four units Five units Unit unit units 6+18 6+6+24 12+12+24 6+6+6+18 9+9+9+18 6+6+6+6+6 6+9+12+12+12 6+24 6+9+12 12+18+18 6+6+6+24 9+9+9+24 6+6+6+6+9 6+9+12+12+18 6+30 6+9+18 12+18+24 6+6+9+12 9+9+12+12 6+6+6+6+12 6+9+12+12+24 6+36 6+9+24 18+18+18 6+6+9+18...
  • Page 9 18+30 18+36 24+24 24+30 24+36...
  • Page 10 12+12+12+24 6+9+9+9+24 9+9+12+12+18 Cassette/Duct/Console/Floor Ceiling：6K/9K/12K/18K/24K； 18+30 9+12+24 9+12+36 6+9+12+18 12+12+18+18 6+9+9+12+12 9+12+12+12+12 18+36 9+18+18 9+18+30 6+9+12+24 6+6+6+30 6+9+9+12+18 9+12+12+12+18 14kW ACiQ-48Z 24+24 9+18+24 9+18+36 6+9+18+18 6+6+9+30 6+9+9+12+24 12+12+12+12+12 -HH-M5B 24+30 9+24+24 12+12+30 6+9+18+24 6+6+12+30 6+9+9+18+18 24+36 12+12+12 12+12+36 6+9+24+24 6+9+9+30...
  • Page 11 9+30 9+9+24 6+6+36 6+9+9+18 6+6+6+30 6+9+9+12+18 9+9+12+12+18 9+36 9+12+18 6+12+36 6+9+9+24 6+6+9+30 6+9+9+12+24 9+12+12+12+18 12+18 9+12+24 9+9+36 6+9+12+18 6+6+12+30 6+9+12+12+18 12+24 12+12+18 9+12+36 6+9+12+24 6+9+9+30 12+30 6+12+12+18 9+9+9+30 12+36 6+12+12+24 9+9+9+30 18+18 9+9+9+18 9+9+12+30 18+24 9+9+9+24 9+12+12+30 18+30 18+36 24+24 24+30 24+36 Suggested Combination...
  • Page 12 6+6+12+12+18 9+9+9+9+12 9+30 6+9+12 9+12+12 6+6+6+36 6+12+18+24 6+6+6+6+30 6+6+12+12+24 9+9+9+9+18 Wall mounted(AG/EP)： 9+36 6+9+18 9+12+18 6+6+9+9 6+18+18+18 6+6+6+6+36 6+6+12+12+30 9+9+9+9+24 ACiQ-55Z 6K/9K/12K/18K/24K/30K/36K； -HH-MB5 16kW Cassette/Duct/Console/Floor 12+12 6+9+24 9+12+24 6+6+9+12 6+18+18+24 6+6+6+9+9 6+6+12+12+36 9+9+9+9+30 Ceiling：6K/9K/12K/18K/24K； 12+18 6+9+30 9+12+30 6+6+9+18 9+9+9+9 6+6+6+9+12...
  • Page 13 18+30 6+12+36 12+12+36 6+6+12+24 9+9+12+12 6+6+6+12+24 6+9+9+12+12 9+9+12+12+18 18+36 6+18+18 12+18+18 6+6+12+30 9+9+12+18 6+6+6+12+30 6+9+9+12+18 9+9+12+12+24 24+24 6+18+24 12+18+24 6+6+12+36 9+9+12+24 6+6+6+12+36 6+9+9+12+24 9+9+12+12+30 24+30 6+18+30 12+18+30 6+6+18+18 9+9+12+30 6+6+6+18+18 6+9+9+12+30 9+9+18+18+18 24+36 6+18+36 12+18+36 6+6+18+24 9+9+12+36 6+6+9+9+9 6+9+9+12+36 9+12+12+12+12 30+30 6+24+24 12+24+24...

  • Page 14: Dimension Of Outdoor Unit

    Dimension Of Outdoor Unit Model Unit ES-18Z-M2B inch 35.04 13.46 26.50 38.98 26.10 13.94 ACIQ-18Z-HH-M2B 1034 ES-27Z-M3B inch 37.2 16.5 31.9 40.6 26.5 15.9 ACIQ-27Z-HH-M3B 1034 ES-36Z-M4B inch 37.2 16.5 31.9 40.6 26.5 15.9...
  • Page 15 Model Unit ACIQ-48Z-HH-M5B 1333 1060 ACIQ-36Z-HH-M4B ES-48Z-M5B ES-55Z-M5B inch 37.5 16.3 52.5 41.7 25.0 15.9 ACIQ-55Z-HH-M5B...

  • Page 16: Refrigerant Cycle Diagram

    Refrigerant Cycle Diagram 3.1 Refrigeration circuit drawing of ES-18Z-M2B INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B LIQUID VALVE B CAPILLARY TUBE Condenser temp. sensor HEAT EXCHANGE HEAT T1 Room T4 Ambient (EVAPORATOR) EXCHANGE temp. sensor temp. sensor (CONDENSER)
  • Page 17 3.3 Refrigeration circuit drawing of ES-27Z-M3B & ACIQ-27Z-HH-M3B 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.
  • Page 18 3.5 Refrigeration circuit drawing of ACIQ-36Z-HH-M4B 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...
  • Page 19 GAS VALVE D HEATING switch T5 Discharge T2B-E temp. sensor GAS VALVE E Low pressure switch Compressor 3.8 Refrigeration circuit drawing of ACIQ-55Z-HH-M5B INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B LIQUID VALVE B Radiator for IPM Plate heat exchanger...

  • Page 20: Installation Details

    Note:The standard pipe length is 7.5m/25ft Installation Details Caution: 4.1 Wrench torque sheet for installation ● Refrigerant pipe diameter different according to indoor unit to be connected. Outside diameter Tightening Torque When using the extension pipe, refer to the tables below. inch ●...

  • Page 21: First-Time Installation

    evacuation. 4.4 First-Time Installation 6. Conduct a 30-minute evacuation. Check whether the compound meter indicates - Air and moisture in the refrigerant system cause 0.1Mpa(14.5Psi). If the meter does not the following problems: indicate -0.1Mpa(14.5Psi) after 30 minutes has elapsed, continue evacuation for 20 more ●...

  • Page 22: Adding Refrigerant After Long-Term System Operation

    3) Place the charging cylinder onto the electronic 6).When the electronic scale displays the proper scale and record the weight. weight (refer to the gauge and the pressure of the low side), disconnect the charge hose from the 3- way valve’s service port immediately and turn off 4) Turn on the air conditioner in cooling mode.

  • Page 23: Evacuation After Servicing The Outdoor Unit Refrigeration Circuit

    pressure. Then remove the charge hose from the 3 way valve. 2. Air purging with vacuum pump 8) Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve. 4.7 Evacuation after servicing the outdoor unit refrigeration circuit 1.
  • Page 24 18N·m (13.27 ft·lbs). Always leak check after servicing the refrigerant system. ACIQ-18Z-HH-M2B, ES-27Z-M3B, ACIQ-27Z- HH-M3B, ES-36Z-M4B ACIQ-36Z-HH-M4B, ES-55Z- M5B, ACIQ-48Z-HH-M5B & ACIQ-55Z-HH-M5B There are one low-pressure centralized valve and one high-pressure centralized valve, it will be more time saving when vacuum and recycle refrigerant.

  • Page 25: Electronic Function

    ---If T5≧TC for 10 seconds, the compressor stops 5. Electronic Function and then restart until T5<90℃ (194 ℉). 5.1 Abbreviation TA=105℃ (221 ℉) TB=110℃ (230 ℉) TC=115℃ T1: Indoor ambient temperature (239 ℉) T2: Middle indoor heat exchanger coil temperature 5.3.3 Fan Speed Malfunction ---- If outdoor fan speed is lower than 100RPM or T2B: Indoor heat exchanger exhaust coil...
  • Page 26 5.3.6 Compressor Current Limit Protection The temperature interval for the current limit is the same as the range of the T4 frequency limit. Cooling mode: CoolT4Zone5I ℃ CoolT4Zone4I CoolT4Zone3I CoolT4Zone2I CoolT4Zone1I CoolReturnI The difference between current limit and shutdown current CoolT4Zone5I Cooling T4≥50℃...
  • Page 27 For other models, Heating mode: For ACIQ-36Z-HH-M4B, ES-48Z-M5B, T4/°C ACIQ-48Z-HH-M5B, ACIQ-55Z-HH-M5B HeatT4Zone4I T4/°C HeatT4Zone3I HeatT4Zone4I HeatT4Zone2I HeatT4Zone3I HeatT4Zone1I HeatT4Zone2I HeatReturnI The difference between current limit and shutdown current HeatT4Zone1I HeatT4Zone4I Heating T4≥15℃current limit value HeatT4Zone3I Heating 14℃＞T4≥10℃ current limit value...

  • Page 28: Control And Functions

    5.3.10 Oil Return 5.3.7 Indoor / Outdoor Units Communication Rules for Operation Protection 1. If the compressor frequency continues to be If the outdoor unit do not receive the feedback lower than the frequency set for setting time, the signal from anyone indoor units for 3 consecutive unit raises the frequency to the frequency set for minutes, the unit stops.
  • Page 29 Cooling Mode: Heating Mode T1 Ts Capacity area Capacity area Norm code (N) Norm code (N) 3 or 4 0.5 0 Model 6K 7K 18K 24K 24K/28K 30K 36K Model 6K 7K 18K 24K 24K/28K 30K 36K 0.6 0.8 1.0 3.0 3.2 Note: The final result is an integer.
  • Page 30 Note:Average value of T2：Sum T2 value of all indoor units)/ (indoor units number ℃ T2 average Decrease frequency Keep frequency Increase frequency Use the following table and final capacity request to confirm the operating frequency. HEAT HEAT HEAT HEAT Frequency (Hz) …...
  • Page 31 4) If the compressor cumulative running time reaches 120 minutes and T3<-15℃. 5) If the air conditioner is shut down from heating mode, it will enter defrost if any of the following conditions are met (this condition can be shielded by parameters): a) The continuous operation time of the press exceeds 30 minutes, and T3<-7 degrees;...
  • Page 32 5.4.3 Outdoor Fan Control T3/°C Increase fan speed 5.4.3.1 Cooling Mode LowCoolT3_ON Under normal operating conditions, the system keep chooses the running fan speed according to the LowCoolT3_Down ambient temperature: Decrease LowCoolT3_OFF Fan stop When low ambient cooling is in effect: Outdoor fan speed control logic (low ambient cooling) When T4 <15 ℃...
  • Page 33 5.4.4 Electronic Expansion Valve (EXV) operation only after EXV initializes. For ACIQ-48Z-HH-M5B, ACIQ-55Z-HH-M5B 1.After the outdoor unit is powered on again, the main valve first opens 510P, then opens 530P, and then is in the standby state (if the current...
  • Page 34 5.4.5 Four-Way Valve Control 5.4.4.1 Cooling Mode The initial open angle of the EXV depends on the In heating mode, a four-way valve is opened. size of the indoor model. The adjustment range is 100-400p. In defrosting, a four-way valve operates according to the current defrosting action.

  • Page 35: Wiring Diagrams

    Wiring Diagrams 6.1 Wiring diagram of 1 drive 2 outdoor ACIQ-18Z-HH-M2B...
  • Page 36 ES-18Z-M2B 5(8)
  • Page 37 6.2 Wiring diagram of 1 drive 3 outdoor ES-27Z-M3B, ACIQ-27Z-HH-M3B...
  • Page 38 6.3 Wiring diagram of 1 drive 4 outdoor ES-36Z-M4B...
  • Page 39 ACIQ-36Z-HH-M4B 16022000036850 MAIN CONTRO L BOARD ELECTRONIC EX PANSIVE VALVE HEAT_D CHASSIS HEATER HEAT_Y REVERSING VALVE COMP TOP COMP. TOP OLP TEMP. SENSOR...
  • Page 40 6.4 Wiring diagram of 1 drive 5 outdoor ACIQ-48Z-HH-M5B, ACIQ-55Z-HH-M5B ES-48Z-M5B, ES-55Z-M5B 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 41 PCB board of ACIQ-18Z-HH-M2B, ES-27Z-M3B, ACIQ-27Z-HH-M3B, ES-36Z-M4B 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 42 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 43 IPM board of ACIQ-18Z-HH-M2B, ES-27Z-M3B, ACIQ-27Z-HH-M3B, ES-36Z-M4B 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 44 PCB board of ES-18Z-M2B 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...
  • Page 45 connect to pipe temp. sensor T3, ambient temp. sensor T4, exhaust T3 T4 T5 CN26 temp. sensor T5 OLP TEMP. CN30 connect to compressor top temp. sensor (5VDC Pulse wave) SENSOR connect to high and low pressure switch(pin1-pin2&pin3-pin4:5VDC H-PRO,L-RPO CN29 pulse wave) TESTPORT CN24...
  • Page 46 PCB Board of ACIQ-48Z-HH-M5B, ACIQ-36Z-HH-M4B, ES-48Z-M5B, ES-55Z-M5B & ACIQ-55Z-HH-M5B...
  • Page 47 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 T5 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 48 IPM board of ACIQ-48Z-HH-M5B , ACIQ-36Z-HH-M4B, ES-48Z-M5B, ES-55Z-M5B & ACIQ-55Z-HH-M5B...
  • Page 49 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 50: Troubleshooting

    Troubleshooting 7.1 Safety 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 51: Indoor Unit Error Display

    7.2 Indoor Unit Error Display For All new models(New Wall mounted(Hi-Wall) series, New Duct/Cassette/Console/ Floor Ceiling): ACIQ-30W-HP230B; • ACIQ-09CD-HH-MB, ACIQ-12CD-HH-MB, ACIQ-18CD-HH-MB, ACIQ-24CD-HH-MB; • ACIQ-09CC-HH-MB, ACIQ-12CC-HH-MB, ACIQ-18CC-HH-MB; • ACIQ-12FM-HH-MB, ACIQ-18FM-HH-MB, ACIQ-24FM-HH-MB; • Timer Operation lamp Display LED STATUS lamp Error ——...
  • Page 52 For All new models(New Wall mounted(Hi-Wall) series, New Cassette/Console/AHU/1-Way Cassette): • ACIQ-06W-HH-MC, ACIQ-09W-HH-MC, ACIQ-12W-HH-MC, ACIQ-18W-HH-MC, ACIQ-24W-HH-MC, ACIQ-30W-HH-MC, ACIQ-36W-HH-MC; • ACIQ-24CC-HH-MB; • ACIQ-18AHB-HH-M, ACIQ-24AHB-HH-M, ACIQ-30AHB-HH-M, ACIQ-36AHB-HH-M; • ACIQ-12FM-HH-MC Timer Operation lamp Display LED STATUS lamp Error —— ★ 1 time 00/EH...
  • Page 53 —— ★ 1 time —— Indoor units mode conflict  PC 03 Low pressure protection ★ 7 times ★ EC 55 Outdoor IPM module temperature sensor fault —— ★ 5 times Communication malfunction between adapter board and outdoor —— EL 16 ★2 times main board(for AHU type) Evaporator coil temperature sensor T2B is in open circuit or has...

  • Page 54: Outdoor Unit Display

    7.3 Outdoor Unit Display 7.3.1 Outdoor Unit Point Check Function A check switch is included on the outdoor PCB. Push SW1 to check the unit's status while running. The digital display shows the following codes each time the SW1 is pushed. Display Remark Number...
  • Page 55 Indoor unit D capacity Indoor unit E capacity Indoor unit A capacity demand code Indoor unit B capacity demand code Norm code*HP Indoor unit C capacity demand code (6K(AG):HP=0.6, 6K(EP)/9K:HP=1:12K: HP=1.5, 18K: HP=2.0,24K/30K/33K/36K: HP=2.5) 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...
  • Page 56 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 ACIQ-48Z- Actual data/4. HH-M5B & ACIQ-55Z-HH-M5B) EVI valve open angle(only for ACIQ-48Z-HH- If the value is higher than 99, the digital display tube will show M5B &...
  • Page 57 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 The capacity unit is horse power. If the indoor unit is not connected, the Indoor unit C capacity digital display shows the following: “――”...
  • Page 58 EXV open angle for D indoor unit EXV open angle for E indoor unit alve MVI v open angle alve EVI v open angle Bit7 Reserve The display value Bit6 Frequency limit caused by voltage is a hexidecimal number. For Bit5 Frequency limit caused by current.
  • Page 59 • PFC module protection occurs three times within 15 minutes: “E6” or alternates between displays of running frequency and “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 ES-18Z-M2B, ACIQ-18Z-HH-M2B, ES-27Z-M3B, ACIQ-27Z-HH-M3B, ES-36Z-M4B.
  • Page 60 High pressure protection Low pressure protection Current overload protection —— Temperature protection of compressor discharge —— Condenser high temperature protection Inverter module (IPM) malfunction Low ambient temperature protection —— Communication malfunction between adapter board and outdoor main —— control board(only for ACIQ-48Z-HH-M5B)
  • Page 61 ES-18Z-M2B, ACIQ-18Z-HH-M2B, ES-27Z-M3B, ACIQ-27Z-HH-M3B, ES-36Z-M4B, ACIQ-36Z-HH-M4B, ES-48Z-M5B, ES-55Z-M5B, ACIQ-55Z-HH-M5B, 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...

  • Page 62: 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. Malfunction conditions Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Potential causes Installation mistake ● Faulty PCB ●...
  • Page 63 7.4.1.2 Communication malfunction between indoor and outdoor units diagnosis and solution. If indoor unit does not receive the feedback from outdoor unit Malfunction conditions during 120 seconds. ● Wiring mistake Potential causes ● Faulty indoor or outdoor PCB Troubleshooting:...
  • Page 64 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 65 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 66 Pic 2: IPM (for 2 zone/ 3-zone) Operating Standby els)
  • Page 67 Pic 2: IPM (for 4 zone&5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby. els)
  • Page 68 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. When PCB does not receive zero crossing signal feedback for Malfunction conditions 4 minutes or the zero crossing signal time interval is abnormal. ●...

  • Page 69: Troubleshooting

    7.4.1.4 Indoor fan speed malfunction diagnosis and solution. When indoor fan speed is too low (300RPM) for a certain period of time, Malfunction conditions the unit ceases operation and the LED displays a failure code. Wiring mistake Potential causes ● Faulty fan assembly ●...
  • Page 70 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 71 some models: Power on and when the unit is in standby, measure the voltage of pin1&pin2 of CN15, pin3 of CN34 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced.
  • Page 72 Part Description Parameter Remark CON1 Power input for the PCB 230V/DC Communication with main PCB DC Test port 5V/DC For debugging board CN23 UVW output for DC fan motor CON2 Ports for reactor CN1 Communication with main PCB Signal Voltage +15V 0~6V 0~15V...
  • Page 73 7.4.1.5 Temperature sensor malfunction diagnosis and solution. If the sampling voltage is lower than 0.06V or higher than 4.94V, Malfunction conditions the LED displays a failure. Wiring mistake Potential causes ● Faulty sensor ● Faulty PCB ● Troubleshooting: Check the connections between temperature Correct the connections.
  • Page 74 7.4.1.6 Inverter module (IPM) malfunction diagnosis and solution. When the voltage signal that IPM send to compressor drive Malfunction conditions chip is abnormal, the display LED will show “P6” and AC will turn off. ● Wiring mistake Potential causes ● IPM malfunction ●...
  • Page 75 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 Connect it tightly,...
  • Page 76 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 77 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 If the sampling voltage is not 5V, the LED will display the failure Malfunction conditions code.
  • Page 78 7.4.1.10 Indoor units mode conflict Error Code P5(old model) or - -(new model) The indoor units cannot work cooling mode and heating at same time. Malfunction conditions Heating mode has a priority. ● Suppose Indoor unit A working in cooling mode or fan mode, and Potential causes indoor unit B is set to heating mode, then A will change to off and B will work in heating mode.
  • Page 79 7.4.1.11 High temperature protection of IPM board diagnosis and solution High temperature protection of IPM board Check whether the radiator is Fix the radiator well fixed well ? Check whether electronic Install the electronic control box control box is Installed correctly good? Check whether thermal...
  • Page 80 7.4.1.12 Communication error between the indoor PCB and display board 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 P CB Does the error still exist? The problem is solved...

  • Page 81: Refrigerant Leakage Detection

    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 82 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 83 7.4.1.15 Communication malfunction between adapter board and outdoor main board diagnosis and solution(EL 16) Malfunction conditions The adapter PCB cannot detect the main control board. ● Wiring mistakes Potential causes ● Faulty adapter board ● Faulty outdoor PCB Shut off the power supply and turn it on 2 minutes later.
  • Page 84 7.4.1.16 Communication malfunction between external fan module and indoor unit or External fan DC bus voltage is too low protection or External fan DC bus voltage is too high fault diagnosis and solution(EH bA/EH 3A/EH 3b) Malfunction conditions EH bA: Indoor unit does not receive the feedback from external fan module during 150 seconds.
  • Page 85 7.4.2 Outdoor unit troubleshooting 7.4.2.1 E0/ EC 51 (Outdoor unit EEPROM parameter error) diagnosis and solution Error Code E0/ EC 51 PCB main chip does not receive feedback from EEPROM chip Malfunction conditions ● Installation mistake Potential causes ● Faulty PCB Troubleshooting: EEPROM: a type of read-only memory.
  • Page 86 7.4.2.2 E2/ EL 01 (Communication malfunction between indoor and outdoor units) diagnosis and solution. Error Code E2/ EL 01 Indoor unit does not receive the feedback from outdoor unit Malfunction during 120 seconds or outdoor unit does not receive the conditions feedback from any one indoor unit during 180 seconds.
  • Page 87 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 88 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 89 Pic 2: IPM board (for 2 zone/ 3-zone) Operating Standby els)
  • Page 90 Pic 2: IPM (for 4 zone & 5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby. els)
  • Page 91 PIC 4: Check point button, press 1 time for check how many indoor units are connected.

  • Page 92: Troubleshooting

    7.4.2.3 E3/ PC 40 (Communication malfunction between IPM board and outdoor main control board) diagnosis Error Code E3/ PC 40 PCB main chip does not receive feedback from IPM module Malfunction during 60 seconds. conditions ● Wiring mistake Potential causes ●...
  • Page 93 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 94 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, F1/F2/F3/F4/F5 (No.A,B,C,D,E Indoor unit coil outlet temp. sensor) malfunction, 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), Outdoor IPM module temperature sensor TH is in open circuit or has short circuited(EC 55), Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited(EC 56),...
  • Page 95 Check the connections between temperature Correct the connections. sensor and PCB. Are the connections good? Check the resistance value of the sensor via Appendix 1 and Appendix 2 Is it normal? Replace indoor or outdoor PCB. Replace the sensor...
  • Page 96 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 An abnormal voltage rise or drop is detected by checking the Malfunction conditions specified voltage detection circuit. ● Power supply problems. Potential causes ●...
  • Page 97 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 98 IPM board (for 4-zone)
  • Page 99 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 100 7.4.2.6 E6/ PC 0F (PFC module protection) error diagnosis and solution. Error Code E6/ PC 0F When the voltage signal that PFC sends to main control board Malfunction is abnormal, the display LED will show “E6” and AC will turn conditions off.
  • Page 101 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 102 Inductance Two ports of the inductance...
  • Page 103 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 When outdoor fan speed keeps too low (300RPM) or too Malfunction conditions high(2400RPM) for certain time, the unit will stop and the LED will display the failure.
  • Page 104 Power off, then restart the unit after 3 minutes. Does a problem remain? The unit is operating normally Shut off the power supply, Rotate the fan by hand. Does it turn easily? Find the cause of the problem and resolve it Check the wiring of fan motor.
  • Page 105 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 107 ➢ 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 108 Part Description Parameter Remark CON1 Power input for the PCB 192-380V/DC Communication with main PCB DC Test port 5V/DC For debugging board FAN1 UVW output for DC fan motor FAN2 UVW output for DC fan motor CN1 Communication with main PCB Signal Voltage 13.5~16.5V...
  • Page 109 7.4.2.8 P1/PC 30 (High pressure protection) diagnosis and solution. Error Code P1/PC 30 If the sampling voltage is not 5V, the LED will display the Malfunction conditions failure. ● Wiring mistake Potential causes ● Faulty over load protector ● System block ●...
  • Page 110 High pressure protection Whether the wiring between the high pressure switch and main control Connect it well board is connected well or correctly Whether the high pressure protector is broken Method: Disconnect the plug. Measure the resistance of high pressure protector, if Replace high pressure protector the protector is normal the value is o,...
  • Page 112 7.4.2.9 P2/PC 31 (Low pressure protection) diagnosis and solution. Error Code P2/PC 31 If the sampling voltage is not 5V, the LED will display the Malfunction conditions failure. ● Wiring mistake Potential causes ● Faulty over load protector ● System block ●...
  • Page 113 Low pressure protection Whether the wiring between the low pressure protector and main control Connect it well board is connected well or correctly Whether the low pressure protector is broken Method: Disconnect the plug. Measure the resistance of the low pressure protector. If the Replace low pressure protector protector is normal the value is Check whether the outdoor...
  • Page 115 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 If the outdoor current exceeds the current limit value, the LED Malfunction conditions will display the failure.
  • Page 116 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 118: Error Code

    7.4.2.11 P4/PC 06 (Temperature protection of compressor discharge) diagnosis and solution. Error Code P4/PC 06 When the compressor discharge temperature(T5) is more Malfunction conditions than 115℃) for 10 seconds, the compressor will stop and restart till T5 is less than 90℃.
  • Page 119 7.4.2.12 P5/PC 0A (High temperature protection of condenser) diagnosis and solution. Error Code P5/PC 0A When outdoor pipe temperature is more than 65°C, the unit will Malfunction conditions stop, and unit runs again when outdoor pipe temperature is less than 52°C ●...
  • Page 120 7.4.2.13 P6/PC 00 (Inverter module (IPM) malfunction) diagnosis and solution. Error Code P6/PC 00 When the voltage signal that IPM send to compressor drive Malfunction conditions chip is abnormal, the display LED will show “P6” and AC will turn off. ●...
  • Page 121 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 Connect it tightly,...
  • Page 122 7.4.2.14. High temperature protection of compressor top(IDU P2/ODU P0/PC 02) If the sampling voltage is not 5V, the LED will display the failure. Malfunction decision conditions Faulty overload protector Supposed causes ● Wiring mistake ● System leakage or block ● Faulty PCB ●...
  • Page 123 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 124 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 125 7.4. 2.18 The cooling operation or heating operation does not operate. ● Faulty 4-way valve Potential causes 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 126 7.4.2.17 Communication malfunction between adapter board and outdoor main control board(ODU Ed/EL Malfunction decision If outdoor PCB does not receive feedback from adapter board. conditions Wiring mistake Supposed causes ● Faulty PCB ● Power off, then restart the unit after 3 minutes.

  • Page 127: 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 128 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 129 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 130 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 131: Ipm Continuity Check

    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 132 White - Black 267Ω±8% (20℃) 253Ω±8% (20℃) 206Ω±8% (20℃) 190Ω±8% (20℃) (Brand: Weiling) (Brand: Dayang) (Brand: Weiling) (Brand: Wolong) Measure the resistance value of each winding by using the tester. Position Resistance Value YKT-70-6- YDK180- YKSS-68-4-14- YKT-53-6-15L-2 204/ YDK70- YSK27-4G YDK45-6B YSK25-6L 1 /YSK68-4B...
  • Page 133 2 Turn off the power, use a digital tester to measure the resistance. The value should be 1.8~2.5 KΩ.

  • Page 134: Disconnect The Connectors

    6.EXV check Disconnect the connectors. 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...
  • Page 135 Red- Blue Red - Yellow Brown-Orange...
  • Page 136 Brown-White...

  • Page 137: Disassembly Instructions

    Disassembly Instructions Note: This part is for reference, the photos may have slight difference with your machine. ➢ ES-18Z-M2B (WX430 metal plate) No. Part name Procedures Remarks How to remove the panel Screws of big handle Screws of top cover plate.
  • Page 138 4) Remove the screws of front Screws of front panel panel, and remove the front panel. (7 screws) Screws of front panel 5) Remove the screws of water collector, and remove the water collector. (3 screws) Screws of water collector...

  • Page 139: Fan Assembly

    Screws of terminal board 6) Remove two screws of terminal board, and 9 screws of right side panel, and remove the right side panel. Screws of right side board How to remove the fan assembly. assembly 1) Remove the top cover, right side panel and front ②...
  • Page 140 Remove the fan motor after unfastening four fixing screws. How to remove the electrical parts. Electrical parts 1) Perform work of item 1. ② 2) Remove 5 screws of the cover of electrical control box cover and remove it. 3) Cut the ribbon by a shear ③...
  • Page 141 6) Remove the support of electronic control box 7) Disconnect the connectors ⑥ and wires connected from PCB and other parts. 8) Disconnect the grounding wire (yellow-green) after removing the big handle ⑧ and the right-rear panel. 9) Remove the PCB board.
  • Page 142 How to remove the compressor. Compressor 1) Perform work of item 1,2,3. 2) Remove the electrical control box and partition plate. ⑥ 3) Extract refrigerant gas. 4) Remove the sound insulation material and crankcase heating cable. 5) Remove terminal cover of compressor, and disconnect wires of crankcase electric heater...
  • Page 143 The 4-way How to remove the 4-way valve valve Coil 1) Perform work of item 1,2. 2) Extract refrigerant gas. Welded parts 3) Remove the electrical parts from item 3. 4) Remove fixing screw of the coil, and remove the coil. 5) Detach the welded parts of 4-way valve and pipe.
  • Page 144 ACIQ-18Z-HH-M2B, ES-27Z-M3B, ACIQ-27Z-HH-M3B, ES-36Z-M4B ➢ (WD30 metal plate) ➢ No. Part name Procedures Remarks How to remove the panel Screws of Screws of top cover big handle plate. Panel plate Turn off the air conditioner. Turn off the power breaker.
  • Page 145 Screws of front panel 12) Remove two screws of terminal board, screws of water collector and fifteen screws of right-rear panel, and remove the right-rear Screws of front panel panel. Screws of front panel...
  • Page 146 Screws of right-rear panel Screws of terminal board...
  • Page 147 How to remove the fan assembly. assembly 5) Remove the top cover, right front side panel and ② front panel from item 1.step 6) Remove the hex nut fixing the fan. 7) Remove the fan. ④ 8) Remove the cover of electrical control box cover.
  • Page 148 How to remove the electrical ③ parts. Electrical parts 10) Perform work of item 1,2. 11) Remove the four screws fixing the IPM board. Unfasten the connector of the reactor. IPM board PCB board Unfasten the connector of the compressor. Disconnect following 3 ④...
  • Page 149 Disconnect the CN17 CN15 CN7 CN18/CN19/CN22 connectors and wires connected from PCB and other parts. Connectors: CN17:T3/T4 temperature sensor (2p/2p,white) CN20 CN7: Discharge temperature sensor CN23 (2p,white) CN25 CN15:T2B-A,B,C temperature sensor (2p/2p/2p,white) CN18/CN19/CN22: Electronic expansion valve A,B,C (6p/6p/6p,red/red/red) CN25/CN23/CN20: S-A,S-B,S-C (3p/3p/3p,white/white/white) CN5/CN6 CN1/CN2...
  • Page 150 How to remove the compressor. Compressor 9) Perform work of item 1,2,3. 10) Remove the electrical control box and partition plate. ⑥ 11) Extract refrigerant gas. 12) Remove the sound insulation material and crankcase heating cable. 13) Remove terminal cover of compressor, and disconnect wires of crankcase electric heater...
  • Page 151 Reactor How to remove the reactor 1) Perform work of item 1,2 2) Unfasten the connector between IPM and reactor. 3) Remove two screws of cover of inductance, and remove the cover of Screws of cover of inductance inductance 4) Disconnect two pieces of wires connected from the cover of inductance.
  • Page 152 How to remove the expansion expansion valve valve 5) Perform work of item 1,2. 6) Remove the electrical parts Expansion valves from item 3. 7) Remove the coils. 8) Detach the welded parts of expansion valves and pipes.
  • Page 153 ➢ ACIQ-36Z-HH-M4B, ACIQ-48Z-HH-M5B, ES-48Z-M5B, ES-55Z-M5B, ACIQ-55Z-HH-M5B (WE30 metal plate) Part name Procedures Remarks How to remove the fan assembly assembly. 1) Turn off the air ② conditioner. Turn off the power breaker. 2) Remove the screws of air outlet grille(8 screws) 3) Remove the hex nut fixing 4) the fan.
  • Page 154 6) Remove the screws of top Screws of top cover cover, and remove the top cover. (4 screws) 7) Remove the screws of front side panel, and remove the front side panel (1 screw) 8) Disconnect the fan motor 9) connectors FAN1(3p,white) and FAN2(3p,white) from DC motor driver board.

  • Page 155: Electrical Parts

    terminal board and 15 screws of right-rear panel and remove right-rear panel. Screws of Water collector Screws of terminal board Screws of right- rear panel Screws of right- rear panel Electrical How to remove the electrical parts parts. 1) Perform work of item 1 step 5~6 and item 2.
  • Page 156 Connector(5p,white) from the IPM board. 3) Disconnect following 6 pieces of connection wires and connectors between IPM and other parts. CN3(red) CN2(black) U(blue),V(red),W(black) CN9(10p,white) CN8,CN5(3p) Remove the 4 screws and unfix the 4 hooks and then CN13 remove the IPM module CN16 CN21 board.
  • Page 157 CN9:T3/T4 temperature sensor (2p/2p,white) CN11:T2B-A,B,C,D,E temperature sensor (2p/2p/2p/2p/2p,white) CN15/CN23/CN26/CN30/CN33: Electronic expansion valve (6p/6p/6p/6p/6p,red) ⑥ CN37/CN29/CN21/CN16/CN13/CN7: S-A,S-B,S-C,S-D,S-E (3p/3p/3p/3p/3p,white) CN10: High and low pressure switch (2p/2p, white) Wires: CN17/CN18: 4-way valve (blue-blue) CN19/CN20: connected to crankcase heating cable. (black-red) CN24/CN25: Electric heater of chassis (orange-orange) CN1:L-IN (red) CN3:N-IN (black)
  • Page 158 Compressor How to remove the compressor. 1) Perform work of item 1 step 5~6 and item 2. ⑤ 2) Extract refrigerant gas. 3) Remove the sound insulation material and crankcase heating cable. 4) Remove terminal cover of compressor, and disconnect wires of crankcase electric heater and compressor from the terminal.
  • Page 159 The 4-way How to remove the 4-way valve valve 1) Perform work of item 1 step 5~6 and item 2. Coil 2) Extract refrigerant gas. Welded parts 3) Remove the electrical parts from item 3. 4) Remove fixing screw of the coil, and remove the coil.

This manual is also suitable for:

Es-27z-m3bEs-36z-m4bEs-48z-m5bEs-55z-m5bAciq-18z-hh-m2bAciq-27z-hh-m3b ... Show all

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