Carrier 38QUS014D8S2-1 Service Manual
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Carrier 38QUS014D8S2-1 Service Manual

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Table of Contents

SUPER INVERTER SERIES
MULTI TYPE
Service Manual

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Summary of Contents for Carrier 38QUS014D8S2-1

  • Page 1 SUPER INVERTER SERIES MULTI TYPE Service Manual...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution ............................... 1 2 Information servicing............................3 3. General information of Indoor Units......................7 4. Features ................................8 5. Dimensions..............................19 6. Service Space (unit: mm)..........................25 7. Wiring diagram ..............................28 8. Indoor units combination ..........................39 9. Operation temperature range........................42 10.

  • Page 3: Precaution

    Precaution fall with it, causing property damage, product failure, and personal injury. 1.1 Safety Precaution Do not let the air conditioner run for a  To prevent injury to the user or other  long time when the humidity is very high and people and property damage, the following a door or a window is left open.
  • Page 4 When the product is not be used for a through air inlet or outlet while the product is  long time, disconnect the power supply plug operated. or turn off the breaker. Do not drink the water drained from the ...

  • Page 5: Information Servicing

    7. Ventilated area 2 Information servicing Ensure that the area is in the open or that it is 1.Checks to the area adequately ventilated before breaking into the Prior to beginning work on systems containing system or conducting any hot work. A degree of flammable refrigerants, safety checks are ventilation shall continue during the period necessary to ensure that the risk of ignition is...
  • Page 6 that there no live electrical components and refrigerant leaks. A halide torch (or any other wiring are exposed while charging, recovering or detector using a naked flame) purging the system; shall not be used. that there is continuity of earth bonding. 14.
  • Page 7 atmospheric pressure to enable work to take place. f) Make sure that cylinder is situated on the scales This operation is absolutely vital if brazing before recovery takes place. operations on the pipe-work are to take place. g) Start the recovery machine and operate in Ensure that the outlet for the vacuum pump is not accordance with manufacturer's instructions.
  • Page 8 The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant Waste Transfer Note arranged. Do not mix refrigerants in recovery units and especially not in cylinders. If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that flammable refrigerant does not...

  • Page 9: General Information Of Indoor Units

    3. General information of Indoor Units Four-way cassette (compact) Four-way cassette (Super Slim ) A6 Ducted Cool Easy Under Ceiling 18 C 14/18/21/27K 28/36/42K...
  • Page 10 Capacity Power supply Carrier Model (Btu/h) 1 Φ, 220-240V~,50Hz 14K-HP-T2 38QUS014D8S2-1 1 Φ, 220-240V~,50Hz 18K-HP-T2 38QUS018D8S2-2 1 Φ, 220-240V~,50Hz 21K-HP-T3 38QUS021D8S3-1 R32 New Multi 1 Φ, 220-240V~,50Hz 27K-HP-T3 38QUS027D8S3-2 1 Φ, 220-240V~,50Hz 28K-HP-T4 38QUS028D8S4-1 1 Φ, 220-240V~,50Hz 36K-HP-T4 38QUS036D8S4-1 1 Φ, 220-240V~,50Hz...

  • Page 11: Features

    4. Features 4.1 Four-way cassette type(compact) 4.1.1 New panel 360°surrounding air outlet design, affords comfortable feeling  4.1.2 Compact design The body size is 570×260×570mm, it’s just smaller than the ceiling board, so it’s very easy for  installation and will not damage the decoration. The panel size is 647×50×647mm. The hooks are designed in the four corners of the body, which can save installation space.
  • Page 12 Fresh Dimension:Φ75mm 4.1.5 Air passage function Reserves the space for air outlet from the side of indoor unit; It’s availed to connect air duct  from the two sides to the nearby small rooms.
  • Page 13 4.2 Four-way cassette type(super slim) 4.2.1 360° Air Flow 360°directional wind can deliver air evenly throughout every corner in any space, reducing hot and cold  spots in the room. 4.2.2 Easy Installation The Cassette is much slimmer due to the redesigned heat exchanger and overall structures. It now ...
  • Page 14 4.2.5 Fresh Air Fresh air intake function brings you fresh and comfortable air feeling.  4.2.6 Wired Controller(Optional) Compared with infrared remote controller, wired controller can be fixed on the wall and avoid mislaying.  It's mainly used for commercial zone and makes air conditioner control more convenient.
  • Page 15 4.3 Ducted 4.3.1 Higher Static Pressure As a ducted air conditioner with medium static pressure, it has the widest static pressure range.  The maximum static pressure reaches 160 Pa  4.3.2 Slim Design The industry Lowest height is designed to be fitted into tight roof spaces. ...
  • Page 16 Filter 4.3.5 Flexible Air Intake Way (Bottom side or Rear side) The frame size of air inlet in rear and bottom is the same. It’s very easy to switch to match different  application. Air intake from bottom (Optional) Air intake from rear (Standard) 4.3.6 Communication wire connection A6 duct uses two wires without polarity connection way, which almost has no mistake during the ...
  • Page 17 4.3.7 Easy Clean Clean the filter (Optional, standard product without filter)  It is easy to draw out the filter from the indoor unit for cleaning, even the filter is installed in rear side or  bottom side. With a larger window design, once the motor and the blower wheels have been detached, heat ...
  • Page 18 A6 ducted has big space for maintenance at the side  4.3.9 Fresh air intake function(Optional) Install one duct from the reserved fresh-air intake to outdoor.  Continually inhale the fresh air to improve the quality of the indoor air, fulfills air quality more healthy and comfortable.
  • Page 19 4.4 Console (NO Model) 4.4.1 Consumes up to 30% less energy than non-inverter units ——DC inverter compressor ——indoor fan motor adopts DC motor 4.4.2 Achieves set temperature more quickly ——air supplying from top and bottom or from top only ——air inlet from four directions 4.4.3 Compact unit body, space saving ——this unit body is very thin and harmonious with room.
  • Page 20 4.4.6 Comfort ——flexible air blow: vertical auto swing and wide angle louvers ensure that warm air reaches the furthest corners of the room and increase the air flow coverage ——Low noise operation, lowest to 23Db ——Low starting power and precise room temperature adjustment 4.4.7 Powerful mode can be selected for rapid cooling or heating.
  • Page 21 4.5.6 Easy operation. 4.5.7 Remote control and optional wired control method.

  • Page 22: Dimensions

    5. Dimensions 5.1 Four-way cassette type (compact): Drain hole Gas side ( for Service ) Liquid side Body 4-install hanger 150 Distribution duct E-parts box 4-Screw hole (for install panel) Drain pipe Fresh air intake Wiring connection port Panel...
  • Page 23 5.2 Four-way cassette type (super slim): Model(KBtu/h) Unit inch 3.15 8.03 1.97...
  • Page 24 5.3 A6 Ducted Model unit (KBtu/h) 7/9/12 inch 27.56 7.87 19.92 17.72 5.39 21.14 1.18 5.98 23.58 7.32 1.97 29.17 14.17 3.31 5.51 3.31 3.31 inch 34.65 8.27 26.54 23.62 5.51 27.8 1.97 5.35 30.79 7.48 1.57 36.22 3.07 5.83 3.46 4.41 1100...
  • Page 25 5.4 Console (N/A) Hanging arm 16 Drain pipe...
  • Page 26 5.5 Under Ceiling 2- 33 Wiring connection port 2- 40 Drain discharge port Fresh air intake Refrigerant pipe hole Hanging arm Capacity (KBtu/h) 1068 1068...
  • Page 27 5.6 Hi-wall 5.6. AG Indoor unit Model (KBtu/h) 7K/9K 1083...
  • Page 28 5.6 Hi-wall 5.6. Indoor unit Cool Easy Capacity Body Code W(mm/inch) D(mm/inch) H(mm/inch) Capacity Body Code W(mm/inch) D(mm/inch) H(mm/inch) 9k~12k 795/31.3 225/8.86 295/11.61 965/38 239/9.41 319/12.56 1140/44.88 275/10.83 370/14.57...

  • Page 29: Service Space (Unit: Mm)

    Service Space (unit: mm) 6.1 Four-way cassette (compact) 6.2 Four-way cassette (super slim)
  • Page 30 6.3 Ducted Ensure enough space required for installation and maintenance All the indoor units reserve the hole to joint the fresh air pipe. The hole size as following: 6.4 Console...
  • Page 31 6.5 Under Ceiling 6.6 Hi-wall 18C/AG Cool Easy...
  • Page 32 Electrical Wiring Diagrams Indoor unit A6 Duct type 7K/9K...
  • Page 33 12K/18K/24K...
  • Page 34 Compact Cassette type: 7K/9K  Page 67 ...
  • Page 35  Page 68 ...
  • Page 36  Page 69 ...
  • Page 37  Page 69 ...
  • Page 38 Wall mounted type 18C 7K/9K/12K/18K  Page 70 ...
  • Page 39 18C 24K  Page 71 ...

  • Page 40: Wiring Diagram

    Cool easy 7K/9K/12K/18/24K INDOOR WIRING DIAGRAM 16022000034214 INDOOR 5(3 or 2) 5(10) 5(10) PLASMA OR ION(12V) CN11 CN13 CN12 CN19 CN21 CN27 CN22 CN26 Transformer or OR UVC Power board CN10 CN15 Pipe Temperature Sensor MAIN BOARD CN701 Switch board CN29 L-OUT CN14...
  • Page 41 Outdoor Unit 14K/18K AC-FAN AMBIENT TEMP. SENSOR CONDENSER TEMP. SENSOR OPTIONAL: DC-FAN  Page 80 ...
  • Page 42 21K/27K 16022000035910  Page 81 ...
  • Page 43 Notes: RJ45 DR BOARD This symbol indicates the element is optional, 16022300000803 the actual shape shall be prevail. This symbol indicates field wiring. OPTIONAL RED(BROWN) INDOOR PIPE OUT TEMP BLUE(BLACK) OUTDOOR AMBIENT TEMPERATURE SENSOR CN14 CN15 CN12 CONDENSER CN29 CompTop LOW/HIGH TEMPERATURE SENSOR DISCHARGE SENSOR...
  • Page 44  Page 78 ...
  • Page 45  Page 79 ...

  • Page 46: Indoor Units Combination

    Indoor units combination 8.1 Indoor unit combination for 14K ODU 14K ODU One unit Two unit 9+12 7+12 8.2 Indoor unit combination for 18K ODU One unit Two unit 9+12 7+12 12+12 8.3 Indoor unit combination for 21K ODU One unit Two unit Three unit 7+7+7...
  • Page 47 8.6 Indoor unit combination for 36K ODU One unit Two unit Three unit Four unit 9+18 7+7+7 7+9+12 7+18+18 9+12+18 7+7+7+7 7+7+9+12 7+9+9+12 9+9+9+12 9+24 7+7+9 7+9+18 9+9+9 9+12+24 7+7+7+9 7+7+9+18 7+9+9+18 9+9+9+18 7+12 12+12 7+7+12 7+9+24 9+9+12 9+18+18 7+7+7+12 7+7+12+12 7+9+12+12 9+9+12+12 7+18 12+18 7+7+18 7+12+12...
  • Page 48 8.7 Indoor unit combination for 42K ODU One Unit Two Unit Three Unit 9+18 7+7+7 7+9+18 9+9+12 12+12+12 9+24 7+7+9 7+9+24 9+9+18 12+12+18 7+12 12+12 7+7+12 7+12+12 9+9+24 12+12+24 7+18 12+18 7+7+18 7+12+18 9+12+12 12+18+18 7+24 12+24 7+7+24 7+12+24 9+12+18 18+18 7+9+9 7+18+18...

  • Page 49: Operation Temperature Range

    9. Operation temperature range Temperature Cooling operation Heating operation Drying operation Mode Room temperature 17℃～32℃ 0℃～27℃ 17℃～32℃ Outdoor temperature -10℃～50℃ -15℃～24℃ -10℃～50℃ CAUTION: 1. If the air conditioner is used beyond the above conditions, certain safety protection features may come into operation and cause the unit to operate abnormally. 2.

  • Page 50: Electronic Function

    10 Electronic function Note: Below function only for light commercial, for Hi-wall units, please refer to 1 drive 1 service manuals. 10.1 Abbreviation For AG/ Cool easy T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature Tp: Compressor discharge temperature Tsc: Ajusted setting temperature...
  • Page 51 10.2.3 A6 Ducted PRE-DEF indicator(cooling and heating type) or fan only indicator(cooling only type) Alarm indicator Timer indicator Infrared signal receiver Operation lamp Display digital tube Temporary button OPERATION TIMER DEF./FAN ALARM MANUAL 10.2.4 Console 10.2.5 Under Ceiling 10.2.6 15C&AB&AG& Cool easy...
  • Page 52 i l f The indoor units can not work coolin g mode and heating at same time. H eat ing m ode h as a p ri o ri t y. 1. Definition Coo ling m ode H ea tin g M ode F a n O ff Coolin g mode...

  • Page 53: General Information Of Outdoor Units

    11 General information of Outdoor Units Model name Dimension (mm) Compressor 805x330x554 KSN140D21UFZ 805x330x554 KSN140D21UFZ KSN140D21UFZ 890x342x673 KTM240D57UMT 890x342x673 946x410x810 KTM240D57UMT 946x410x810 KTF310D43UMT 946x410x810 KTF310D43UMT...

  • Page 54: Features

    12 Features Outdoor unit Power relay control Low noise air flow system Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode. 4 way valve control It is only operated in the heating operation mode except defrosting operation. Anti-rust cabinet Valve protection cover It protects the valves and prevents water from dripping.
  • Page 55 14K/18K...
  • Page 56 21K/27K...
  • Page 57 28K/36K/42K...
  • Page 58 Refrigerant Cycle Diagrams Piping length (m) Pipe Size Elevation (m) (Diameter:ø) Additional Model Refrigerant Rated IDU and Between Liquid Single Total IDUs 2x9.52 2x6.35 12g/m...
  • Page 59 Piping length (m) Pipe Size Elevation (m) (Diameter:ø) Additional Model Refrigerant Rated IDU and Between Liquid Single Total IDUs 3x9.52 3x6.35 22.5 12g/m...
  • Page 60 Piping length (m) Pipe Size (Diameter:ø) Elevation (m) Additional Model Refrigerant Rated IDU and Between Liquid Single Total IDUs 3x9.52+1x12.7 4x6.35 12g/m 3x9.52+1x12.7 4x6.35 12g/m...
  • Page 61 Piping length (m) Pipe Size (Diameter:ø) Elevation (m) Additional Model Refrigerant Rated IDU and Between Liquid Single Total IDUs 4x9.52+1x12.7 5x6.35 37.5 12g/m...

  • Page 62: Sound Levels

    15 Sound Levels Outdoor Unit Microphone 1.0m Note: H= 0.5 × height of outdoor unit Model Noise Power dB(A) Noise level dB(A)
  • Page 63 16Installation Details 16.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque N.cm N.cm Ф6.35 1500(153kgf.cm) 1600(163kgf.cm) Ф9.52 2500(255kgf.cm) 2600(265kgf.cm) Ф12.7 3500(357kgf.cm) 3600(367kgf.cm) 16.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Rated current of appliance Nominal cross-sectional area (mm²) >3 and ≤6...
  • Page 64 Caution: ● Refrigerant pipe diameter is different according to indoor unit to be connected. When using the extension pipe, refer to the tables below. ● When refrigerant pipe diameter is different from that of outdoor unit union (for 18K&24K indoor unit), additional transfer connector needs to be used on outdoor unit union.
  • Page 65 Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles come out, the pipes have leakage. 1.
  • Page 66 2. Adding the refrigerant if the pipe length >5m Electronic scale Procedure: 1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder.
  • Page 67 16.5 Adding the refrigerant after running the system for many years Electronic scale Procedure: 1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve. Connect the charge hose to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge.
  • Page 68 16.6 Re-installation while the indoor unit need to be repaired 1. Collecting the refrigerant into the outdoor unit Procedure 1). Confirm that both the 2-way and 3-way valves are set to the opened position Remove the valve stem caps and confirm that the valve stems are in the opened position. Be sure to use a hexagonal wrench to operate the valve stems.
  • Page 69 16.7 Re-installation while the outdoor unit need to be repaired 1. Evacuation for the whole system Procedure: 1). Confirm that both the 2-way and 3-way valves are set to the opened position. 2). Connect the vacuum pump to 3-way valve’s service port. 3).
  • Page 70 2. Refrigerant charging Procedure: 1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder.

  • Page 71: Electronic Control Function

    Electronic control function 17.1 Abbreviation For AG: T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature Tp: Compressor discharge temperature Tsc: Ajusted setting temperature For other models: T1: Indoor ambient temperature T2: Coil temperature of indoor heat exchanger middle.
  • Page 72 frequency and “LC”(each displays 0.5s)  In forced cooling mode, the LED displays “FC” or alternative displays between running frequency and “FC”(each displays 0.5s)  When PFC module protection occurs three times within 15 minutes, the LED displays “E6” or alternative displays between running frequency and “E6”(each displays 0.5s) ...
  • Page 73 temperature is higher than 50 ℃, the digital display shows “50.” If the Indoor unit B room temperature (T indoor unit is not connected, the digital display shows: “――” Indoor unit C room temperature (T Indoor unit D room temperature (T Indoor unit E room temperature (T Indoor unit A evaporator temperature (T Indoor unit B evaporator temperature (T...
  • Page 74 17.5 Protection 17.5.1 Three minutes delay at restart for compressor. 17.5.2 Temperature protection of compressor discharge. When the compressor discharge temp. is getting higher, the running frequency will be limited as below rules: C o m p re s s o r o ff F re q u e n c y lim it F re q u e n c y h o ld in g N o rm a l...
  • Page 75 HeatZone4 HeatZone3 HeatZone2 HeatZone1 17.5.5 Indoor / outdoor units communication protection If the indoor units cannot receive the feedback signal from the outdoor units for 2 minutes, the AC will stop and display the failure. 17.5.6 High condenser coil temp. protection. Decrease Hold Resume...

  • Page 76: Troubleshooting

    18. Troubleshooting 18.1 Indoor unit error code explanation: For Four- way cassette type (compact), A6 Duct(7K/9K) Operation Lamp Malfunction Timer Lamp Error Code (flashes) Indoor EEPROM malfunction Communication malfunction between indoor and outdoor units Indoor fan speed has been out of control Open or short circuit of T1 temperature sensor Open or short circuit of T2 temperature sensor Refrigerant leakage detection...
  • Page 77 For Mission2 type and Ultimate Comfort type: Malfunction Error Code Indoor unit EEPROM parameter error E0/EA Indoor / outdoor units communication error Indoor fan speed is operating outside of the normal range Indoor room temperature sensor T1 open circuit or short circuit Evaporator coil temperature sensor T2 open circuit or short circuit Communication error between the indoor PCB and display board Eb/EH 0b...
  • Page 78 Evaporator coil middle temperature sensor T2 is in 6 times EH 61 open circuit or has short circuited The outdoor fan speed is operating outside of the 12 times EC 07 normal range 9 times EH 0b Indoor PCB/Display board communication error 8 times EL 0C Refrigerant leakage detection...
  • Page 79 18.2 Outdoor unit error code explanation: For other models, Display LED STATUS Outdoor EEPROM malfunction Indoor / outdoor units communication error Communication malfunction between IPM board and outdoor main board Open or short circuit of outdoor unit temperature sensor(T3,T4.T5) Voltage protection PFC module protection Outdoor fan speed has been out of control or compressor speed has been out of control No A Indoor unit coil outlet temperature sensor or connector of sensor is defective...
  • Page 80 For 21/27/42K Model 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 Outdoor unit low AC voltage protection PC 10 Outdoor unit main control board DC bus high voltage protection PC 11...
  • Page 81 EC 50 Open or short circuit of outdoor unit temperature sensor(T3,T4.T5)
  • Page 82 18.3 Trouble shooting 18.3.1 For the indoor unit 18.3.1.1 Indoor EEPROM malfunction (IDU E0/EA/EH 00/EH 0A) Power off, then restart the unit 2 minutes later Replace the indoor main PCB EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.
  • Page 83 18.3.1.2 Indoor / outdoor units communication error(E1(IDU)/ E2(ODU)/ EL 01(IDU/ODU)) 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.
  • Page 84 Pic 1: check the voltage of N to S (Vs), is it moving alternately between positive value and negative value? Pic 2:IPM or outdoor main PCB Operating Self-Check Pic 2: IPM or outdoor main PCB Power, Self-Check Operating...
  • Page 85 PIC3 :Main board LED when power on and unit standby. PIC 4: check point button, Press 1 time for check how many indoor units are connected...
  • Page 86 18.3.1.3 Indoor fan speed has been out of control (IDU E3/ EH 03 ) Power off, then restart the Power off, then restart the unit 2 minutes later. Is it still The unit operates normally. unit 2 minutes later. Is it still The unit operates normally.
  • Page 87 DC motor voltage input and output For split type: Color Signal Voltage Vs/Vm 280V~380V Black White 14-17.5V Yellow 0~5.6V Blue 14-17.5V For other types: Color Signal Voltage Vs/Vm 192V~380V Black White 13.5-16.5V Yellow 0~6.5V Blue 13.5-16.5V...
  • Page 88 18.3.1.4 Open or short circuit of temperature sensor(IDU E4/E5/EH 60/EH 61) Check the connections Check the connections between temperature between temperature Correct the connections. Correct the connections. sensor and PCB. Are the sensor and PCB. Are the connections good? connections good? Measure the resistance value Measure the resistance value of the sensor via Appendix 1...
  • Page 89 18.3.1.7 Communication error between the indoor PCB and display board(IDU Eb/EH 0b) Power off, then restart the unit 2 minutes later Check the wirings Correct the connection and connection or replace the wirings Replace the indoor main PCB Replace the Display board 10.3.1.8 Inverter compressor drive malfunction(IDU P4/ PC04) The trouble shooting is same with IPM module protection.
  • Page 90 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? indoor PCB...
  • Page 91 18.3.3 For the outdoor unit 18.3.3.1 Outdoor EEPROM malfunction(ODU E0/EC 51) Power off, then restart the Power off, then restart the unit 2 minutes later unit 2 minutes later Replace the outdoor main PCB Replace the outdoor main PCB EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.
  • Page 92 18.3.3.3 Communication malfunction between IPM board and outdoor main board(ODU E3/PC 40) E3 display Communication malfunction between IPM board and outdoor main board Is there at least one LED in the IPM board light? Check the signal wire between the IPM board and the main board, is it connected good? Reconnect and retry.
  • Page 93 18.3.3.4 Voltage protection(ODU E5) Outdoor unit low AC voltage protection(PC10) Outdoor unit main control board DC bus high voltage protection(PC11) Outdoor unit main control board DC bus high voltage protection /341 MCE error(PC12) Voltage protection Check the voltage of outdoor unit power supply, whether the voltage Check the power supply between L(L1) and N (L2) is...
  • Page 94 18.3.3.5 PFC module protection (ODU E6/PC 0F) 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 module Replace the outdoor main board is normal? DC277-356V for 18-27KBtu/h;...
  • Page 95 18.3.3.6 Outdoor fan speed has been out of control or compressor speed has been out of control (ODU E8/EC 07) Over current failure of outdoor DC fan motor (ODU EC71) Power off, then restart the unit after 2 minutes. Does a problem remain? The unit is operating normally Shut off the power supply, Rotate the fan by hand.
  • Page 96 Index 1: 1. Outdoor 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 97 18.3.3.7 High pressure protection (ODU P1/PC 30)(For M4OB-36HFN8-Q, M5OD-42HFN8-Q) 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...
  • Page 98 18.3.3.8 Low pressure protection (ODU P2/PC 31) (For M4OB-36HFN8-Q, M5OD-42HFN8-Q) Low pressure protection Low pressure protection Whether the wiring Whether the wiring between the low pressure between the low pressure protector and main control Connect it well protector and main control Connect it well board is connected well or board is connected well or...
  • Page 99 18.3.3.9 Current protection of compressor (ODU P3/PC 08) Outdoor unit zero speed protection(ODU PC44) Compressor speed has been out of control(ODU PC46) Compressor overcurrent failure(ODU PC49) Current protection of compressor Judge 1: Check whether the input current of the power supply wire is higher than max protection current value Check whether...
  • Page 100 18.3.3.10 Temperature protection of compressor discharge (ODU P4/ PC 06) 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...
  • Page 101 18.3.3.11 High temperature protection of condenser (ODU P5/ PC 0A) When outdoor pipe temperature is more than 65°C, the unit will stop, and unit runs again when outdoor pipe temperature less than 52°C. Check the connection Check the connection between temperature Correct the connection between temperature Correct the connection...
  • Page 102 18.3.3.12 IPM module protection (ODU P6/PC 00) 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 18-28KBtu/h; 208-230V, 1N, 60Hz can work normally? DC277-410V for 36-42KBtu/h...
  • Page 103 18.3.3.1 (ODU P PC 02 Top temperature protection of compressor Check if the air flow system Clear up the air inlet and outlet or the heat of indoor and outdoor units exchanger of indoor and outdoor units. are obstructed? Turn off the power supply and turn it on 10 minutes later.
  • Page 104 18.3.3.14 Lack phase failure of outdoor DC fan motor(EC72) 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 Replace the fan motor...
  • Page 105 18.3.3.15 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 compressor is symmetrical...
  • Page 106 18.3.3.19 Automatic correction of wiring/piping error: Press the "check switch" on the outdoor unit PCB board 5 seconds until LED display "CE", which mean this function is working, Approximately 5-10 minutes after the switch is pressed, the "CE" disappear the wiring/piping error will be corrected, and wiring/piping is properly connected. Check switch LED display...
  • Page 107 Main parts check 18.4 1. Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temperature(T1) sensor, Indoor coil temperature(T2) sensor, Outdoor coil temperature(T3) sensor, Outdoor ambient temperature(T4) sensor, Compressor discharge temperature(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 108 Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4,T2B (℃--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...
  • Page 109 Appendix 2 Temperature Sensor Resistance Value Table for T5 (℃--K) (TP for AG) K Ohm K Ohm K Ohm K Ohm ℃ ℃ ℃ ℃ 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...
  • Page 110 2.Compressor checking 1. Measure the resistance value of each winding by using a multi-meter. 2. Check the resistance value of each winding in the following table.
  • Page 111 3. IPM continuity check Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. 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;...

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