Haier 1U68REMFRA Service Manual
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Haier 1U68REMFRA Service Manual

Wall mounted type dc inverter
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SERVICE MANUAL
Wall Mounted Type
DC Inverter
Model No.
1U68REMFRA
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
Repair the product or products dealt with in this service information by anyone else could result in serious injury or death
2018 (Qingdao Haier Air Conditioner General corp. , Ltd)
All rights reserved. Unauthorized copying and distribution is a violation of law
Haier Group
Version V1
Date 2018-12-07

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  • Page 1 Repair the product or products dealt with in this service information by anyone else could result in serious injury or death 2018 (Qingdao Haier Air Conditioner General corp. , Ltd) All rights reserved. Unauthorized copying and distribution is a violation of law...

  • Page 2: Table Of Contents

    Contents Contents 1. Introduction ....................1 2. Specifications..................7 3. Sensors list ....................8 4. Piping diagrams ..................9 5. Operation range ..................10 6. Printed circuit board connector wiring diagram ........11 7. Functions and control................8. Dimensional drawings................9. Center of gravity ................... 10. Service diagnosis ................11.

  • Page 3: Introduction

    Introduction 1. Introduction 1.1 Model name explanation Apply toT1; 220~240V50HZ/1ph DC inverter Heat pump & R32 refrigerant Version number Europe Platform of outdoor units: 2p (2p platform) Nominal cooling capacity (24000BTU/h) Type of outdoor unit : U (normal type) The maximum combination number Domestic air conditioner...
  • Page 4 Introduction 1.2 Safety Cautions Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “Warning” and “Caution”. The “Warning” items are especially important since they can lead to death or serious injury if they are not followed closely. The “Caution” items can also lead to serious accidents under some conditions if they are not followed.
  • Page 5 Introduction Warning Do not repair the electrical components with wet hands . Working on the equipment with wet hands can cause an electrical shock Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical shock.
  • Page 6 Introduction Warning Be sure to use an exclusive power circuit for the equipment, and follow the technical standards related to the electrical equipment, the internal wiring regulations and the instruction manual for installation when conducting electrical work. Insufficient power circuit capacity and improper electrical work can cause an electrical shock or fire. Be sure to use the specified cable to connect between the indoor and outdoor units.
  • Page 7 Introduction 1.2.3 Inspection after Repair Warning Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet all the way. If the plug has dust or loose connection, it can cause an electrical shock or fire. If the power cable and lead wires have scratches or deteriorated, be sure to replace them.
  • Page 8 Introduction 1.2.5 Using Icons List Icon Type of Information Description A “note” provides information that is not indispensable, but may Note Note nevertheless be valuable to the reader, such as tips and tricks. A “caution” is used when there is danger that the reader, through incorrect manipulation, may damage equipment, loose data, get Caution Caution...

  • Page 9: Specifications

    Specification 2 .Specifications NOMINAL DISTRIBUTION SYSTEM VOLTAGE NOMINAL CAPACITY and NOMINAL INPUT cooling heating 7.0(2.2-8.5) 8.1(2.4-10.0) Capacity rated 27640(8190-34120) Btu/h 23880(7500-29000) Power Consumption(Rated) 2.16 2.18 . 7.0 . 4.0 1963 ³ 2.8*10 ³ TECHNICAL SPECIFICATIONS-UNIT Dimensions H*W*D 890×353x697 Packaged 1046x460x780 H*W*D Dimensions dB(A)

  • Page 10: Sensors List

    Specification TECHNICAL SPECIFICATIONS-OTHERS Refrigerant type Refrigerant charge Refrigerant Maximum allowable distance circuit between indoor an outdoor Maximum allowable level difference Refrigerant control liquid 6.35 Piping connections 12.7 (external diameter) drain Heat insulation type Both liquid and Gas pipes Max. piping Length Max.

  • Page 11: Piping Diagrams

    Pinping diagrams 4 Piping diagrams Domestic air conditioner...

  • Page 12: Operation Range

    Operation range 5.Operation range Domestic air conditioner...

  • Page 13: Printed Circuit Board Connector Wiring Diagram

    Printed circuit board connector wiring diagram 6. Printed circuit board connector wiring diagram Connectors PCB (1) (Control PCB) For 1U18JEFFRA/1U24REFFRA/1U24REBFRA 1) CN1, CN2 Connector for power N and L 2) CN3 Connector for ground 3) CN23 Connector for DC POWER 15V and 5V to the module board 4) CN9, CN10 Connector for CN2,CN1 on the module board 5) CN22 Connector for fan motor 6) CN11 Connector for four way valve coil...
  • Page 14 Printed circuit board connector wiring diagram PCB (1) CN23 CN24 CN25 CN28 CN10 CN36 CN11 CN15 CN47 CN17 CN22 Domestic air conditioner...
  • Page 15 Printed circuit board connector wiring diagram PCB(2) CN10 CN11 Domestic air conditioner...
  • Page 16 Functions and control Wiring diagrams INDOOR UNIT 0010534175 OUTDOOR UNIT WIRING DIAGRAM COMPRESSOR CN28 BR(OR B) C(W) R(U) AC-L S(V) CN25 BL(OR W) AC-N FUSE1 T25A 250VAC CN24 CN36 CN11 MODULE COM COMB OUTDOOR PCB COMA CN6 CN7 CN8 CN9 BL(OR W) CN23 CN10...

  • Page 17: Functions And Control

    Functions and control 7. Functions and control 7.1 Main functions and control specification 7.1.1 The operation frequency of outdoor unit and its control 7.1.1.1 The operation frequency control of compressor The operation frequency scope of compressor Mode Minimum operation frequency Maximum operation frequency Heating 18K/24K 24 Hz /20Hz...
  • Page 18 Functions and control Wh_c<-2 Max_hz3 103HZ/87 HZ Wh_c<5 Max_hz4 90HZ/76 HZ Wh_c<10 Max_hz5 78HZ/67 HZ Wh_c<17 Max_hz6 67HZ/62 HZ Wh_c<20 Max_hz7 56HZ/44 HZ Wh_c> 20 Max_hz8 52HZ/39 HZ Remarks: The above are the maximum frequency limitations of the complete appliance which are affected by the environment, and they have nothing to do with the ability of the indoor unit.
  • Page 19 Functions and control When refrigerating, it is needed to satisfy F-MIN-d(compressor’s Min_hz)< F<F-MAX-d(compressor’s Max_hz) When heating, it is needed to satisfy F-MIN-r (compressor’s Min_hz)< F<F-MAX-r (compressor’s Max_hz) PID control : The innital frequency Sn is determined by Pn . We can calculate Hzoutf according to the value of Kp ,Ki ,Kd, Out_gain,Pn.Then , Fn = Sn + Hzoutf.
  • Page 20 Functions and control The EEV opening will increase if SH (superheat degree) >0 while decrease if SH<0. Adjust frequency: If |SH|=0, 60s/ 1 step If |SH| 3,and SH=0, 10s/ 1 step. If 3 |SH| 0, 30s/ 1 step. SH= current SH- last SH SH= Ts (suction temp)-Tc1 (indoor coil temp)-Tsh (fixed data, depend on different models, -1~2) 7.1.4 Four way control For the details of defrosting four-way valve control, see the defrosting process.
  • Page 21 Functions and control (18K/24K) TC( ) The compressor stops Fgh_t1 63 /63 Fgh_t1 2 Fgh_t2 2 N Decreasing the frequency rapidly Fgh_t2 59 /59 P Decreasing the frequency slowly Fgh_t3 56 /57 Fgh_t3 2 Fgh_t4—2 Q Prohibiting increasing the frequency Fgh_t4 53 /51 R Increasing slowly Fgh_t5 40 /40...
  • Page 22 Functions and control During the starting process of the compressor, if the AC current is greater than 13.5/14A(18K/24K), the frequency of the compressor decreases at the speed of 0.1HZ/second. During the starting process of the compressor, if the AC current is greater than 13A/13A(18K/24K), the frequency of the compressor increases at the prohibited speed.
  • Page 23 Functions and control control-driven chip will enter into weak magnetic control, this will help to relieve the problem of modification rate. If during the course of weak magnetic control, the modification rate is still not high enough, enter into the control of decreasing frequency until the alarm of modification rate is relieved. 7.1.5.7 Temperature protection of the outdoor refrigerating coil When the frequency are higher than 40Hz,and the defrosting sensor’s temperature are higher than , the frequency of the compressor decreases 1hz/10seconds.
  • Page 24 Functions and control 35.6202 33.3552 31.2062 -1.38 1.31 33.8936 31.7844 29.7796 -1.36 1.29 32.2608 30.2968 28.4267 -1.34 1.28 30.7162 28.8875 27.1431 -1.32 1.26 29.2545 27.5519 25.9250 -1.29 1.24 27.8708 26.2858 24.7686 -1.27 1.22 26.5605 25.0851 23.6704 -1.25 1.20 25.3193 23.9462 22.6273 -1.23 1.18...
  • Page 25 Functions and control 5.5914 5.3269 5.0704 -1.33 1.29 5.3916 5.1308 4.8783 -1.37 1.33 5.2001 4.9430 4.6944 -1.41 1.36 5.0163 4.7630 4.5185 -1.45 1.40 4.8400 4.5905 4.3500 -1.49 1.44 4.6708 4.4252 4.1887 -1.53 1.47 4.5083 4.2666 4.0342 -1.57 1.51 4.3524 4.1145 3.8862 -1.61 1.55...
  • Page 26 Functions and control 1.3730 1.2525 1.1415 -3.27 3.01 1.3335 1.2153 1.1066 -3.32 3.06 1.2953 1.1794 1.0730 -3.38 3.10 1.2583 1.1448 1.0405 -3.43 3.15 1.2226 1.1113 1.0092 -3.48 3.19 1.1880 1.0789 0.9789 -3.53 3.24 1.1546 1.0476 0.9497 -3.58 3.28 1.1223 1.0174 0.9215 -3.64 3.33...
  • Page 27 Functions and control 13654.1707 11267.8730 9290.2526 -2.95 2.44 12735.8378 10531.3695 8700.6388 -2.93 2.44 11885.1336 9847.7240 8152.2338 -2.92 2.43 11096.6531 9212.8101 7641.8972 -2.91 2.42 10365.4565 8622.8491 7166.7474 -2.90 2.42 9687.0270 8074.3787 6724.1389 -2.88 2.41 9057.2314 7564.2244 6311.6413 -2.87 2.41 8472.2852 7089.4741 5927.0206 -2.86 2.40...
  • Page 28 Functions and control 996.7169 887.6792 789.8583 -2.29 2.06 945.1404 843.0486 751.3077 -2.27 2.04 896.4981 800.8922 714.8380 -2.26 2.03 850.6086 761.0603 680.3265 -2.24 2.02 807.3024 723.4134 647.6580 -2.22 2.00 766.4212 687.8205 616.7252 -2.20 1.99 727.8172 654.1596 587.4271 -2.18 1.98 691.3524 622.3161 559.6694 -2.16 1.96...
  • Page 29 Functions and control 129.2457 122.1630 115.3645 -1.40 1.34 123.8956 117.2504 110.8618 -1.37 1.32 118.7926 112.5589 106.5564 -1.35 1.30 113.9241 108.0776 102.4388 -1.32 1.28 109.2784 103.7961 98.5000 -1.30 1.26 104.8443 99.7046 94.7315 -1.28 1.23 100.6112 95.7939 91.1253 -1.25 1.21 96.5692 92.0553 87.6735 -1.23 1.19...
  • Page 30 Functions and control 26.1569 24.8685 23.6222 -1.57 1.52 25.3290 24.0574 22.8291 -1.61 1.55 24.5311 23.2765 22.0662 -1.65 1.59 23.7620 22.5245 21.3323 -1.69 1.63 23.0205 21.8002 20.6261 -1.73 1.66 22.3055 21.1025 19.9465 -1.77 1.70 21.6159 20.4303 19.2924 -1.81 1.74 20.9508 19.7825 18.6626 -1.85 1.77...

  • Page 31: Dimensional Drawings

    Dimensinal drawings 8.Dimensional drawings unit:mm 9.Center of gravity unit:mm Domestic air conditioner...

  • Page 32: Service Diagnosis

    Service diagnosis 10 Service Diagnosis 10.1 Caution for Diagnosis The operation lamp flashes when any of the following errors is detected. 1. When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions, disabling equipment operation. 2.
  • Page 33 Service diagnosis 10.2 Problem Symptoms and Measures Check the power supply. Check to make sure that the rated voltage is supplied. None of the units operates Check the indoor PCB Check to make sure that the indoor PCB is broken Operation A power failure of 2 to 10 cycles can stop air conditioner Check the power supply.
  • Page 34 Service diagnosis 10.3 Error Codes and Description indoor display Code indication Indoor displaying panel code indication Outdoor Reference fault description (LED1 Page Only For 498 and flash 498A display Other times) (Red/Green Time Run display Indoor and Communication fault Outdoor between indoor Page .43...
  • Page 35 Service diagnosis 10.3.1 Thermistor or Related Abnormality Indoor Display E1: Room temperature sensor failure E2: Heat-exchange sensor failure Outdoor display LED1 flash 10 times Defrost temperature sensor failure LED1 flash 11 times Suction temperature sensor failure LED1 flash 12 times Ambient temperature sensor failure LED1 flash 13 times Discharge temperature sensor failure Method of The temperatures detected by the thermistors are used to determine thermistor errors...
  • Page 36 Service diagnosis 10.3.2 EEPROM abnormal Indoor Display E4: Indoor EEPROM error Indoor display F12: Outdoor EEPROM error; Outdoor LED1 flash 1 times Method of The Data detected by the EEPROM are used to determine MCU Malfunction Detection Malfunction When the data of EEPROM is error or the EEPROM is damaged Decision Conditions Supposed...
  • Page 37 Service diagnosis 10.3.3 Indoor AC fan motor malfunction Indoor Display Method of The rotation speed detected by the Hall IC during fan motor operation is used to determine Malfunction abnormal fan motor operation Detection Malfunction when the detected rotation feedback signal don’t received in 2 minutes Decision Conditions Supposed...
  • Page 38 Service diagnosis 10.3.4 Outdoor DC fan motor fault Outdoor display LED1 flash 9 times Method of DC fan motor is detected by checking the fan running condition and so on Malfunction Detection Malfunction when the data of EEPROM is error or the EEPROM is damaged Decision Conditions Supposed...
  • Page 39 Service diagnosis Domestic air conditioner...
  • Page 40 Service diagnosis 10.3.5 IPM protection / F1 LED1 flash 2 times Outdoor display: Method of IPM protection is detected by checking the compressor running condition and so on Malfunction Detection Malfunction The system leads to IPM protection due to over current Decision The compressor faulty leads to IPM protection Conditions...
  • Page 41 Service diagnosis 10.3.6 Over-current of the compressor Outdoor Display: F2 LED1 flash 3 or 24 or 25 times Method of The current of the compressor is too high Malfunction Detection Malfunction when the IPM Module is damaged Decision or the compressor is damaged. Conditions power supply voltage is too low or too high Supposed...
  • Page 42 Service diagnosis 10.3.7 The communication fault between IPM and outdoor PCB Outdoor display: LED1 flash 4 times Method of Communication is detected by checking the IPM module and the outdoor PCB Malfunction Detection Malfunction The outdoor PCB broken leads to communication fault Decision The IPM module broken leads to communication fault Conditions...
  • Page 43 Service diagnosis 10.3.8 Power Supply Over or under voltage fault Outdoor display: LED1 flash 6 times The power supply is over voltage Method of An abnormal voltage rise or fall is detected by checking the specified voltage detection circuit. Malfunction Detection Malfunction An voltage signal is fed from the voltage detection circuit to the microcomputer...
  • Page 44 Service diagnosis 10.3.9 Overheat Protection For Discharge Temperature Outdoor display: F4 LED1 flash 8 times Method of The Discharge temperature control is checked with the temperature being detected Malfunction by the Discharge pipe thermistor Detection Malfunction when the compressor discharge temperature is above 110 Decision Conditions Supposed...
  • Page 45 Service diagnosis 10.3.10 The communication fault between indoor and outdoor Indoor display outdoor display LED1 flash 15 times Method of Communication is detected by checking the indoor PCB and the outdoor PCB. Malfunction Detection Malfunction The outdoor PCB broken leads to communication fault. Decision The indoor PCB broken leads to communication fault.
  • Page 46 Service diagnosis Domestic air conditioner...
  • Page 47 Service diagnosis 10.3.11 Loss of synchronism detection Inverter side current detection is abnormal Outdoor Display LED1 flash 18 times LED1 flash 19 times Method of The position of the compressor rotor can not detected normally Malfunction Detection Malfunction when the wiring of compressor is wrong or the connection is poor; Decision or the compressor is damaged Conditions...
  • Page 48 Service diagnosis 10.3.12 High work-intense protection Outdoor display LED1 flash 21 times Method of High work-intense control is activated in the heating mode if the temperature Malfunction being sensed by the heat exchanger thermistor exceeds the limit. Detection Malfunction Activated when the temperature being sensed by the heat exchanger Decision rises above 65 twices in 30 minutes.
  • Page 49 Performance and curves diagrams 11.Performence and curves diagrams 11.1 Cooling capacity-temperature curves performance curves cooling value-temerature table outdoor temp. indoor temp. DB/WB 5268 5250 5080 4766 6035 6584 6308 6028 5792 21/15 5583 5556 5360 5054 6317 6798 6706 6370 6038 24/16 6207...

  • Page 50: Performance And Curves Diagrams

    Performance and curves diagrams 11.2 Cooling power consumption value- temperature curves performance curves power consumption value-temp.table outdoor temp. indoor temp. DB/WB 1699 1694 1639 1439 1811 2198 2485 2752 21/15 1745 1736 1675 1034 1464 1845 2293 2591 2804 24/16 1881 1845 1792...
  • Page 51 Performance and curves diagrams 11.3 Cooling discharge pressure curves performance curves cooling discharge pressure.table outdoor temp. indoor temp. (humidity 46%) DB/WB 21/15 27/19 35/24 1899 2010 2107 1949 2037 2141 1976 2064 2178 2079 2144 2287 2211 2385 2478 2429 2546 2674 2615...
  • Page 52 Performance and curves diagrams 11.4 Cooling suction pressure curves performance curves cooling suction pressure.table outdoor temp. indoor temp. (humidity 46%) DB/WB 21/15 27/19 35/24 1011 1163 1001 1112 1279 1101 1201 1394 cooling suction pressure and temp curves Domestic air conditioner...
  • Page 53 Performance and curves diagrams 11.5 Heating capacity-temperature curves performance curves heating capacity and indoor/outdoor temp.table outdoor temp. indoor temp.(humidity 46%) DB/WB -7/-8 12/11 18/16 24/20 heating capacity and indoor/outdoor temp.curves Domestic air conditioner...
  • Page 54 Performance and curves diagrams 11.6 Heating power consumption value- temperature curves performance curves power consumption value-temp.table indoor temp.(humidity 46%) outdoor temp. DB/WB -7/-8 12/11 18/16 24/20 heating consumption and indoor/outdoor temp.curves 3500 3000 · 2500 · 2000 · 1500 1000 -7/-8 12/11 18/16...
  • Page 55 Performance and curves diagrams 11.7 Heating discharge pressure curves performance curves heating discharge pressure.table indoor temp. outdoor temp DB/WB -7/-8 12/11 18/16 24/20 heating discharge pressure and temp. curves 4000 3500 3000 2500 2000 1500 1000 -7/-8 12/11 18/16 24/20 outdoor temp.(DB/WB) Domestic air conditioner...
  • Page 56 Performance and curves diagrams 11.8 Heating suction pressure curves performance curves heating suction pressure.table indoor temp. outdoor temp DB/WB -7/-8 12/11 1011 1051 1071 18/16 1197 1237 1257 24/20 heating suction pressure and temp. curves 1400 1300 1200 1100 1000 -7/-8 12/11 18/16 24/20 outdoor temp.(DB/WB)

  • Page 57: Circuit Diagrams

    ircuit Diagra 12. Circuit diagrams 12.1 Outdoor unit control board circuit diagrams omestic air conditioner...
  • Page 58 ircuit Diagra 12.2 Module board circuit diagram omestic air conditioner...
  • Page 59 ircuit Diagra omestic air conditioner...
  • Page 60 Circuit diagrams Sincere Forever Haier Group Edited by : Shi Haiyan Haier Industrial Park, No.1, Haier Road Yang Xiaodong 266101, Qingdao, China_ Signed by : Yang Wenjun Http //www.haier.com Approved by: Wu Hongjin Domestic air conditioner...
  • Page 61 Repair the product or products dealt with in this service information by anyone else could result in serious injury or death 2018 (Qingdao Haier Air Conditioner General corp. , Ltd) All rights reserved. Unauthorized copying and distribution is a violation of law Haier Group Version：V1...
  • Page 62 1.Removal of Outdoor panel Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Loosen the screws and lift the top panel and remove the handle. Domestic air conditioner...
  • Page 63 Loosen the screws of the panel, pull and remove the front panel. Domestic air conditioner...
  • Page 64 Removal of procedure     2.Removal of Electrical Box Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points                    ...
  • Page 65 Removal Procedure 3.Removal of Fan and Fan Motor Loosen the fixing screws. Remove the fan and motor. Domestic Air Conditioner...
  • Page 66 Removal Procedure 4.Removal of Fan Motor Bracket and Partition Loosen the fixing screws and lift the fan motor bracket. Remove the partition Domestic Air Conditioner...
  • Page 67 Removal Procedure 5.Removal of Compressor and Heat Exchanger Remove the valve plate. Remove the valves and the compressor. Loosen the screws and remove the heat exchanger. Domestic Air Conditioner...

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