Haier 1U68WEGFRA Service Manual Download Page 57

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Removal of procedure

Domestic air conditioner

1. Removal of Outdoor panel

Procedure

Warning Be sure to wait 10 minutes or more after turning off all power supplies
before disassembling work

Step

Procedure

Points

1.Remove the panels

Loosen the screws and
lift the top panel and
remove the handle.

Removal of procedure

Summary of Contents for 1U68WEGFRA

Page 1: ...rvice 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 WARNING 2021 Qingdao Haier Air Conditioner General corp Ltd All rights reserved Unauthorized copying and distribution is a vi...

Page 2: ... 7 3 Sensors list 8 4 Pinping diagrams 9 5 Operation range 10 6 Printed Circuit Board Connector Wiring Diagram 11 7 Outdoor Functions and Control 14 8 Dimensional drawings 28 10 Service Diagnosis 29 11 Performence and cerves diagrams 44 12 Sound level 52 13 Circuit diagrams 53 ...

Page 3: ... name explanation 1 U 6 8 W E G F A R The maximum combination number Type of outdoor unit U normal type Platform of outdoor units 3P platform Nominal cooling capacity 24000BTU h Europe Version number Heat pump R32 refrigerant DC inverter Apply toT1 220 240V50HZ 1ph ...

Page 4: ...test operation to ensure that the equipment operates Normally and explain the cautions for operating the product to the customer 1 2 1 Embedded wire checking before installation Check the embedded wire diameter suitable to request Power supply from indoor 2 5kw 1 0mm 2 3 5kw 5kw 1 5mm 2 7kw 2 5mm 2 Power supply from outdoor 1 0mm 2 Check the embedded wire are four roots L N COM GND GND is needed i...

Page 5: ...an cause an electrical shock or fire 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 Be sure to provide the grounding when repairing the equipment in a humid or wet place to avoid electrical shock Be sure ...

Page 6: ...er electrical work can cause an electrical shock or fire Be sure to use the specified cable to connect between the indoor and outdoor units Make the connections securely and route the cable properly so that there is no force pulling the cable at the connection terminals Improper connections can cause excessive heat generation or fire When connecting the cable between the indoor and outdoor units m...

Page 7: ...emains around the unit it can cause a fire Be sure to install the packing and seal on the installation frame properly If the packing and seal are not installed properly water can enter the room and wet the furniture and floor 1 2 4 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 ...

Page 8: ...ock Be sure to check the drainage of the indoor unit after the repair Faulty drainage can cause the water to enter the room and wet the furniture and floor 1 2 4 Using Icons Icons are used to attract the attention of the reader to specific information The meaning of each icon is described in the table below 1 2 5 Using Icons List Icon Type of Information Description Note Note A note provides infor...

Page 9: ...UNIT Dimensions H W D mm 890 340 705 Packaged H W D mm 1046 460 780 Dimensions Weight KG 44 Gross weight KG 48 Sound peessure dB 53 Sound level Sound power dB 68 ELECTRICAL SPECIFICATIONS Cooling heating Nominal running current A 9 17 7 Maximum running current A 13 13 Starting current A 1 1 TECHNICAL SPECIFICATIONS PARTS cooling heating Type Rotary Compressor Model SVB172FNQMC Compressor Motor out...

Page 10: ...as pipes Max piping Length m 25 Max Level Difference m 15 Chargeless m 7 Amount of Additional Charge of Refrigerant g m 20 Note the data are based on the conditions shown in the table below h t g n e l g n i p i P g n i t a e h g n i l o o c Indoor 27 DB 19 WB Outdoor 35 DB 24 WB Indoor 20 DB Outdoor 7 DB 6 WB 5m 3 Sensors list type Description Qty Ambient sensor Its used for detecting temperature...

Page 11: ...Piping diagrams 9 Domestic air conditioner 4 Piping diagrams EEV EEV ...

Page 12: ...Operation range 10 Domestic air conditioner 5 Operation range 10 0 21 27 35 20 40 60 43 20 40 ...

Page 13: ...resentative trouble Alarm 3 RV1 RV2 RV3 RV4 Varistor 1 CN1 Connector for power N and L 2 CN2 3 CN3 Connector for ground 4 CN7 BLACK 5 CN8 WHITE Connector for the U V W wire of the compressor 6 CN9 RED 7 L IN CN5 Connector for reactor 8 L OUT CN6 9 CN10 Connector for fan motor 10 CN11 Connector for four way valve coil 11 CN15 Connector for Temperature sensor 12 CN4 Connector for communicate between...

Page 14: ...Wiring diagrams 12 Domestic air conditioner PCB 1 Bottom heater 4 way valve E valve Sensor DC fan motor PFC Reactor Compressor L N PE S ...

Page 15: ...Wiring diagrams Wiring diagrams 13 Domestic air conditioner ...

Page 16: ...cy and every determined frequency for protection should be prior to the calculated frequency 7 1 1 3 The speeds of increasing or decreasing the frequency of the compressor The speed of increasing or decreasing the frequency rapidly 1 1HZ second The speed of increasing or decreasing the frequency slowly 2 1HZ 10seconds 7 1 1 4 The calculation of the compressor s frequency Refrigeration dehumidifica...

Page 17: ... appliance which are affected by the environment but also the maximum ability limitation of the system When the starting ability is not the maximum its maximum frequency limitation is calculated by the following equations The frequency limitation which is affected by the temperature and under the condition of actual ability the actual running system ability the maximum frequency which is limited b...

Page 18: ...ed from skipping frequently it must be kept under each mode for over 30 seconds and then it can be changed to another mode when refrigerating the time is changed to 15 seconds 7 1 2 1 The outdoor DC fan control Within three minutes of compressor starting the compressor is controled according to the ambient temperature Tao Tao 22 22 Tao 29 Tao 29 Refrigeration dehumidification 510rpm 610rpm 710rpm ...

Page 19: ...pressor is started during the course of self detection there s no such limitation Sensor detection methods 100 times one cycle of procedure run is one time and about 5ms detection method for eac h time continuously sampling for 8 times then order them and take the mean value of the middle 2 values take the mean value TTC Abnormal stop 108 Decreasing the frequency rapidly 1HZ second 104 Decreasing ...

Page 20: ...n continue to run it only after the power is off During the starting process of the compressor if the AC current is greater than 9A the frequency of the compressor decreases at the speed of 1HZ second During the starting process of the compressor if the AC current is greater than 8A the frequency of the compressor decreases at the speed of 0 1HZ second During the starting process of the compressor...

Page 21: ... rate is not high enough the 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 ...

Page 22: ...22 103 3598 93 8305 85 1031 1 80 1 64 21 97 6556 88 7989 80 6728 1 78 1 63 20 92 3028 84 0695 76 5017 1 76 1 62 19 87 2775 79 6222 72 5729 1 74 1 60 18 82 5577 75 4384 68 8710 1 72 1 59 17 78 1230 71 5010 65 3815 1 70 1 57 16 73 9543 67 7939 62 0907 1 68 1 55 15 70 0342 64 3023 58 9863 1 66 1 54 14 66 3463 61 0123 56 0565 1 64 1 52 13 62 8755 57 9110 53 2905 1 62 1 51 12 59 6076 54 9866 50 6781 1 ...

Page 23: ... 0 81 0 80 23 11 2172 10 8634 10 5114 0 78 0 78 24 10 7475 10 4216 10 0964 0 75 0 75 25 10 3000 10 0000 9 7000 0 75 0 75 26 9 8975 9 5974 9 2980 0 76 0 76 27 9 5129 9 2132 8 9148 0 80 0 80 28 9 1454 8 8465 8 5496 0 84 0 83 29 8 7942 8 4964 8 2013 0 87 0 86 30 8 4583 8 1621 7 8691 0 91 0 90 31 8 1371 7 8428 7 5522 0 95 0 93 32 7 8299 7 5377 7 2498 0 98 0 97 33 7 5359 7 2461 6 9611 1 02 1 00 34 7 25...

Page 24: ...2 1383 1 9803 2 45 2 29 68 2 2347 2 0695 1 9147 2 49 2 34 69 2 1652 2 0032 1 8516 2 54 2 38 70 2 0983 1 9393 1 7908 2 59 2 42 71 2 0337 1 8778 1 7324 2 63 2 46 72 1 9714 1 8186 1 6761 2 68 2 50 73 1 9113 1 7614 1 6219 2 73 2 54 74 1 8533 1 7064 1 5697 2 78 2 58 75 1 7974 1 6533 1 5194 2 83 2 63 76 1 7434 1 6021 1 4710 2 88 2 67 77 1 6913 1 5528 1 4243 2 92 2 71 78 1 6409 1 5051 1 3794 2 97 2 75 79...

Page 25: ...5977 0 5328 4 69 4 21 111 0 6528 0 5820 0 5183 4 74 4 26 112 0 6361 0 5667 0 5043 4 80 4 31 113 0 6200 0 5518 0 4907 4 86 4 36 114 0 6043 0 5374 0 4775 4 92 4 41 115 0 5891 0 5235 0 4648 4 98 4 45 116 0 5743 0 5100 0 4524 5 04 4 50 117 0 5600 0 4968 0 4404 5 10 4 55 118 0 5460 0 4841 0 4288 5 16 4 60 119 0 5325 0 4717 0 4175 5 22 4 65 120 0 5194 0 4597 0 4066 5 28 4 70 Discharging Sen sor R80 50KΩ...

Page 26: ... 5371 2 58 2 25 2 2434 5487 2112 5459 1831 4826 2 56 2 24 1 2296 6230 1996 2509 1733 6024 2 55 2 23 0 2167 2730 1887 0018 1641 4966 2 53 2 22 1 2045 9191 1784 3336 1554 7931 2 52 2 21 2 1932 0242 1687 8144 1473 1460 2 50 2 20 3 1825 0899 1597 0431 1396 2333 2 48 2 19 4 1724 6540 1511 6468 1323 7551 2 47 2 17 5 1630 2870 1431 2787 1255 4324 2 45 2 16 6 1541 5904 1355 6163 1191 0048 2 43 2 15 7 1458...

Page 27: ...65 1 76 1 64 42 250 2676 232 0436 214 9529 1 74 1 63 43 239 0983 221 9825 205 9065 1 71 1 61 44 228 4809 212 4060 197 2844 1 69 1 59 45 218 3860 203 2887 189 0648 1 67 1 57 46 208 7855 194 6066 181 2273 1 65 1 55 47 199 6531 186 3369 173 7524 1 63 1 54 48 190 9639 178 4584 166 6217 1 60 1 52 49 182 6945 170 9508 159 8181 1 58 1 50 50 174 8228 163 7951 153 3249 1 56 1 48 51 167 3280 156 9733 147 12...

Page 28: ...1 00 0 99 86 41 7386 40 2604 38 7996 1 03 1 02 87 40 3241 38 8545 37 4048 1 07 1 06 88 38 9643 37 5045 36 0668 1 11 1 09 89 37 6569 36 2078 34 7831 1 14 1 13 90 36 3996 34 9622 33 5513 1 18 1 16 91 35 1903 33 7653 32 3689 1 22 1 19 92 34 0269 32 6151 31 2338 1 26 1 23 93 32 9075 31 5096 30 1438 1 30 1 27 94 31 8302 30 4467 29 0970 1 33 1 30 95 30 7933 29 4246 28 0915 1 37 1 34 96 29 7950 28 4417 2...

Page 29: ...47 12 4165 11 5510 2 50 2 35 123 12 9531 12 0503 11 2003 2 54 2 39 124 12 5840 11 6965 10 8617 2 58 2 43 125 12 2270 11 3545 10 5348 2 63 2 47 126 11 8817 11 0240 10 2191 2 68 2 51 127 11 5475 10 7046 9 9142 2 72 2 55 128 11 2242 10 3957 9 6197 2 77 2 59 129 10 9112 10 0970 9 3352 2 81 2 63 130 10 6084 9 8082 9 0602 2 86 2 67 131 10 3151 9 5288 8 7945 2 91 2 71 132 10 0312 9 2586 8 5378 2 95 2 75 ...

Page 30: ...Dimensinal drawings Domestic air conditioner 8 Dimensional drawings 9 Center of gravity 28 677 374 132 unit mm unit mm 353 288 890 ...

Page 31: ...pplied Check the indoor PCB Check to make sure that the indoor PCB is broken Operation sometimes stops Check the power supply A power failure of 2 to 10 cycles can stop air conditioner operation Equipment operates but does not cool or does not heat only for heat pump Check for faulty operation of the electronic expansion valve Set the units to cooling operation and compare the temperatures of the ...

Page 32: ...press instantaneous stop F27 Directly display 8 Compressor discarging temperature protection Page 41 F4 Directly display F8 Trouble record 9 Abnormal of DC motor Page 41 F21 Directly display 10 Abnormal of piping sensor Page 31 F7 Directly display 11 Suction temperature sensor failure Page 31 Outdoor Abnormal of outdoor ambient sensor Malfunction 12 Page 31 F6 Directly display 13 Abnormal of compr...

Page 33: ...nput is more than 4 92V or less than 0 08V during compressor Decision operation Conditions z Note The values vary slightly in some models Supposed Faulty connector connection Causes Faulty thermistor Faulty PCB Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector or else parts damage may be occurred Thermistor resistance chec k method Remove the connector...

Page 34: ...ta 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 Faulty EEPROM data Causes Faulty EEPROM Faulty PCB Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Replace the indoor or outdoor mainboard ...

Page 35: ... faulty indoor unit PCB Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector or else parts damage may be occurred Check whether terminals on indoor pcb is well Electrify the machine again and turn it on in the cooling operation Measure voltage between the positions 1and 3 of Terminal CN5 on the indoor PCB the voltage is about 90 220vac check whether motor...

Page 36: ...ng condition and so on Malfunction Detection Malfunction when the data of EEPROM is error or the EEPROM is damaged Decision Conditions Supposed DC fan motor protection dues to the DC fan motor faulty Causes DC fan motor protection dues to faulty PCB Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred ...

Page 37: ...ote controller check whether the motor could run Remove fan motor after switch off the power Measure the resistances between black line 0V and red line 310V between black line 0V and white line 15V of the fan motor NO YES The resistances are greater than 40KΩ NO YES The motor of the outdoor unit is damaged and needs replacing NO The motor and outdoor pcb are well YES The outdoor pcb is damaged rep...

Page 38: ...o over current Decision The compressor faulty leads to IPM protection Conditions circuit component of IPM is broken and led to IPM protection Supposed IPM protection dues to the compressor faulty Causes IPM protection dues to faulty PCB of IPM module Compressor wiring disconnected Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector or else parts damage m...

Page 39: ...ubleshooting Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Electrify the machine again and turn it on with the remote controller If malfunctions are reported before or upon the compressor being started up Repair the power supply The system may have been over or under charged with gas which can be judged through the pressure of the m...

Page 40: ...ply voltage not as specified Causes the IPM module is broken the outdoor PCB is broken Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector or else parts damage may be occurred Electrify the machine again and turn it on with the remote controller Check whether the compressor is started normally Is it ok Yes Maybe there is some disturbance NO No 230 is ok ...

Page 41: ...red Electrify the machine again and turn it on with the remote controller then measure the temperature at the exhaust temperature sensor of the compressor on the outdoor unit The temperature exceeds 110 shortly after the machine starts up 1 The cryogen may have been leaked during installation or there may be leakage in the piping system 2 There may be other causes to make the exhaust temperature t...

Page 42: ...r PCB and the outdoor PCB Malfunction Detection Malfunction Decision Conditions Supposed Causes Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector or else parts damage may be occurred The outdoor PCB broken leads to communication fault The indoor PCB broken leads to communication fault Communication wiring disconnected The indoor PCB is broken The outdo...

Page 43: ...Service diagnosis 41 Domestic air conditioner 5 The outdoor pcb is damaged replace it with a new one The outdoor pcb is damaged replace it with a new one ...

Page 44: ...r Faulty PCB Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Within 3 minutes after the machine is supplied with power and turned on with the remote controller check whether the compressor can start up 1 The wiring of compressor is incorrect or the connection is poor 2 The compressor is damaged At first the compressor ...

Page 45: ...rty heat exchanger Faulty heat exchange sensor Insufficient gas Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector or else parts damage may be occurred Electrify the machine again and turn it on with the remote controller check whether the wind temperature is below 65 The malfunction is reported after the machine has run for some time 1 Check room tempe...

Page 46: ...35 5188 4962 6081 6741 6598 6219 5960 27 19 6047 6011 5759 5466 6892 7583 7152 7085 6549 30 22 6423 6286 6150 5808 7175 7858 7653 7380 6901 32 23 6814 6716 6524 6215 7701 8304 8167 7880 7373 35 24 7144 6973 6792 6492 7775 8652 8392 8004 7624 cooling value temerature table performance curves outdoor temp 3500 4500 5500 6500 7500 8500 cooling capacity W cooling capacity and indoor outdoor temp curve...

Page 47: ...06 1405 1827 2235 2526 2760 27 19 1833 1822 1745 1090 1568 2021 2334 2773 2960 30 22 1889 1849 1809 1120 1582 2021 2410 2847 3043 32 23 1947 1919 1864 1199 1698 2136 2653 3040 3251 35 24 1984 1937 1887 1252 1714 2225 2726 3088 3362 power consumption value temp table performance curves outdoor temp 100 600 1100 1600 2100 2600 3100 3600 power consumption w indoor temp DB WB power consumption and tem...

Page 48: ...15 27 19 35 24 10 1884 1986 2056 15 1905 2012 2088 20 1956 2039 2169 25 2006 2118 2202 30 2187 2357 2461 35 2433 2516 2621 38 2618 2701 2876 40 2895 3045 3166 43 3286 3442 3582 cooling discharge pressure and temp curves 4000 3500 21 15 3000 2500 27 19 2000 35 24 1500 1000 10 15 20 25 30 35 38 40 43 outdoor temp DB WB 46 Domestic air conditioner discharge pressure Kpa ...

Page 49: ... DB WB 21 15 27 19 35 24 10 739 865 1005 15 746 874 1015 20 754 891 1025 25 794 900 1046 30 835 948 1057 35 844 957 1112 38 888 987 1135 40 977 1086 1249 43 1075 1173 1361 cooling suction pressure and temp curves 1550 1350 21 15 1150 950 27 19 750 550 35 24 350 10 15 20 25 30 35 38 40 43 outdoor temp DB WB 47 Domestic air conditioner suction pressure Kpa ...

Page 50: ...7 5052 7 8 7361 6674 6202 2 1 7869 6945 6298 7 6 7659 7073 6293 12 11 6856 6316 5506 18 16 5609 5289 4638 24 20 4500 4045 3607 indoor temp humidity 46 heating capacity and indoor outdoor temp table performance curves 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 heating capacity W heating capacity and indoor outdoor temp curves 10 20 27 outdoor temp DB WB ...

Page 51: ...9 2103 2208 7 8 2108 2243 2355 2 1 2190 2305 2420 7 6 2028 2113 2218 12 11 1435 1543 1698 18 16 1066 1185 1303 24 20 753 836 920 indoor temp humidity 46 power consumption value temp table performance curves 0 500 1000 1500 2000 2500 3000 15 10 7 8 2 1 7 6 12 11 18 16 24 20 cooling capacity w outdoor temp DB WB heating capacity and indoor outdoor temp curves 10 20 27 ...

Page 52: ...0 20 27 15 2534 2706 2772 10 2814 2917 3015 7 8 3200 3338 3436 2 1 3365 3619 3710 7 6 3304 3514 3605 12 11 3232 3409 3542 18 16 2994 3204 3380 24 20 2559 2723 2874 heating discharge pressure and temp curves 4000 3500 10 3000 20 2500 27 2000 1500 1000 15 10 7 8 2 1 7 6 12 11 18 16 24 20 outdoor temp DB WB 50 Domestic air conditioner discharge pressure Kpa ...

Page 53: ...27 15 345 385 404 10 397 427 447 7 8 491 531 551 2 1 610 650 670 7 6 743 783 803 12 11 843 883 903 18 16 1010 1050 1070 24 20 1196 1236 1256 heating suction pressure and temp curves 1400 1300 1200 1100 1000 900 10 800 700 20 600 500 400 27 300 200 100 0 15 10 7 8 2 1 7 6 12 11 18 16 24 20 outdoor temp DB WB 51 Domestic air conditioner suction pressure Kpa ...

Page 54: ...ircuit diagrams 52 Domestic air conditioner 12 Sound level Model Sound pressure level Sound power level cooling heating 230V 50HZ Measuring location of microphone Cooling heating H L SL 1U68WEGFRA 62 68 ...

Page 55: ...D4 0 47UF 630VDC CBB1 24V 1W 1 W_Fan Vn 10 LIN2 10 R88 Vn_Fan 100Ω 0603 B5P VH 24 Wn 15 LIN3 15 R121 Wn_Fan 15V 13 VDD 100Ω 0603 IC2 R93 3 6KΩ 0603 R5F524TAADFP 5V LED2 R73 5V LED_EER Fault_IPM VOt_SH VFO14 VFO 23 3 3KΩ 0603 R94 1KΩ 0603 W Vs3 23 RJ45_RXD 19 C59 02 C 5 5 3 0 02 C 9 5 0 0 NU RJ45_TXD 1 V 0603 1 V 0603 COM 1 1 5V 5V NC 0603 NGND NGND NV 18 Vcc1 3 3 NGND NGND Vcc2 8 8 Vcc3 13 13 15V ...

Page 56: ...rams Domestic air conditioner Sincere Forever Haier Group Haier Industrial Park No 1 Haier Road 266101 Qingdao China Http www haier com Edited by Signed by Approved by Shi haiyan Wang wanli Li jingsheng Yang wenjun ...

Page 57: ...f Outdoor panel Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 Remove the panels 1 Loosen the screws and lift the top panel and remove the handle Removal of procedure ...

Page 58: ...Removal of procedure Domestic air conditioner Step Procedure Points 2 Loosen the screws of the panel pull and remove the front panel 3 Loosen the fixting screws and remove the side panel ...

Page 59: ... conditioner 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 1 Remove the fixing screws than lift the electrical box ...

Page 60: ... air conditioner 3 Removal of Fan and Fan Motor Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points Loosen the fixing 1 screw and remove the fan ...

Page 61: ...edure Domestic air conditioner Step Procedure Points 2 Loosen the fixing screws and remove the fan motor Put the head wire through the back of the motor when assembling soas not to be entangled with the propeller fan ...

Page 62: ...er 4 Removal of fan motor bracket and partition Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 Loosen the fixing screws and remove the fan motor bracket ...

Page 63: ...Procedure Points 2 Loosen the fixing screws The partition plate has a hook on the lower side than lift and pull the proof plate Remove the partition plate When assembling fit the lower hook into the bottom frame Removal of procedure ...

Page 64: ...of compressor and heat exchanger Procedure Warning Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work Step Procedure Points 1 Cut down the concenting pipe and put out the compressor and remove the valve bracket ...

Page 65: ...Domestic air conditioner Step Procedure Points 2 Loosen the marked fixing screws and remove the heat exchanger Removal of procedure ...

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