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5. Refrigerating Cycle Block Diagram

INDOOR UNIT

OUTDOOR UNIT

Heat
exchanger
(Evaporator)

Gas side

3-way valve

2-way valve

Liquid side

Capillary tube

Gas leak check point

Cross fan

Heat
exchanger
(Condenser)

Propeller fan

Compressor

Cooling

Refrigerating cycle temperature and pressure

STD Pressure

Piping Temp(°F)

Use Temp. Condition(°F)

MODEL

Operating Condition

(psi)

Indoor

Outdoor

3-Way Valve

Standard

57~71

46~54

AS24A1QC

Cooling

Max over load

115

Low temp

Standard

64~78

50~54

AS18A1QC

Cooling

Max over load

115

Low temp

1- 5/14/01 8:44 PM Page 21

Summary of Contents for US18A2QC

Page 1: ...n 2 Disassembly and Reassembly 3 Troubleshooting 4 Exploded Views and Parts List 5 Refrigerating Cycle Block Diagrams 6 Wiring Diagrams 7 Schematic Diagrams ROOM AIR CONDITIONER INDOOR UNIT AS24A2QC AS18A2QC OUTDOOR UNIT US24A2QC US18A2QC E DB68 00277A 6 ...

Page 2: ...ve and open the 3 way valve again 5 Check the pressure indicated by the pressure gauge low pressure side Standard pressure is should be 4 5 5 5kg cm2 in a reqular high operation mode 6 Open the refrigerant tank and fill with refrigerant until the rated pressure is reached It is recommended not to pour the refrigerant in too quickly but gradually while operating a pressure valve 8 Close the 3 way v...

Page 3: ... entering 6 Make sure you do not bend the connection pipes in the middle and store together with the cables 7 Move the indoor and outdoor units to a new locatioon 8 Remove the mounting plate for the indoor unit and move it to a new location Pump down shall be carried out when an evaporator is replaced or when the unit is relocated in another area 1 Remove the caps from the 2 way valve and the 3 wa...

Page 4: ...to the left and right handle and pull to open the inlet grille 4 Take the left and right filter out 5 Loosen one of the right fixing screw and seperate the terminal cover 6 Loosen two fixing screws of front grille 7 Pull the upper left and right of discharge softly for the outside cover to be pulled out 8 Pull softly the lower part of discharge and push it up Caution Assemble the front panel and f...

Page 5: ...connector of PCB upper side out Inclusion Power cord 3 Separate the outdoor unit connection wire from the terminal block 4 If pulling the Main PCB up it will be taken out Separate the TRANS hook it before 1 Do 1 and 2 3 above 2 Loosen two fixing earth screws of right side 3 Separate the connection pipe 4 Separate the bush body at the upper side and holder at the rearside 5 Loosen the two fixing sc...

Page 6: ...nd Cross Fan 1 Do 1 2 3 4 above 2 Loosen the fixing three screws and separate the motor holder 3 Loosen the fixing screw of fan motor By use of M3 wrench 4 Separate the fan motor from the fan 5 Separate the fan from the left holder bearing 5 ...

Page 7: ... cover 3 Remove the control box cover 4 Unplug the ass y cable 5 Remove the cabi side 6 Remove the cabi front When you assemble the parts check if the each parts and electric connectors are fixed firmly 1 Do Procedure 1 above 2 Remove the nut flange Turn to the right to remove as it is a left turned screw 3 Disassemble the propeller fan 1 2 ...

Page 8: ...nit lights up and the air conditioner does not operate 6 The compressor stops intermittently in a COOL mode or DRY mode and fan speed of the indoor unit decreases It indicates power is on The LED stops blinking if the operation ON OFF button on the remote control unit is pushed In happens after a delay of 3 minutes when the compressor is reoperated The same phenomenon occurs when a power is on As ...

Page 9: ... Is voltage of 1 indoor fan of the micom normal Is voltage at 32 terminal of the Micom normal 0VDC Is voltage at 64 terminal of the Micom normal 5VDC Is the rating voltage 10 range applied to the primary side of the power transformer Check linkage between power cord and terminal tap Check fuse Is 14 18VAC appear in the secondary side of the power transformer Replace power transformer YES NO YES NO...

Page 10: ...nplugging out the power cord should be reconnected within five seconds Does the operating lamp Green blink Does the Solid State Relay SS71 work properly Is the supply voltage of the fan motor sufficient Test rod location PCB CN73 pin3 pin5 Condition Fan operate AC 180V Normal voltage YES YES YES NO NO NO Check as in the procedur NO power parts Refer tp page 8 Microcomputer is out of order PCB is o...

Page 11: ... lamp blink YES YES NO NO NO 2 NO YES NO NO Outdoor unit is out of order Power relay is out of order Power relay should be replaced PCB should be checked PCB is out of order PCB and Room tempera ture sensor should be checked Room temperature sensor is out of order Check as in the procedure No Power parts Refer to page 5 2 YES Is the room sensor normal register 25 C 10kΩ 10 C 20 C 30 C 17 96k Ω 12 ...

Page 12: ... Remove power cord and plug in again in approx 5 seconds Is operating lamp blinking Does operation start when swing button of the remote con trol unit pushed Voltage at pin 33 36 of micom ICO4 change Squarewave Volatge at pin 10 11 12 13 of IC05 KID65003 change Squarewave UP DOWN louver motor is faulty Driver IC05 KID65003 is faulty Micom IC04 is faulty Normal Check as in the procedure No Power pa...

Page 13: ... is faulty Q601 C4375Y or Q602 C1623Y is faulty IR LED CL 1L5EU is faulty sound heard from the indoor unit when ON OFF button on the remote control unit pushed Voltage of battery less than 2 5V Remote Control Unit LCD display status of REMOCON normal Voltage at PIN 30 of Remocon Micom change Voltage at collecter of Q601 or Q602 change Voltage at pin 26 of micom IC04 change INDOOR UNIT Micom IC04 i...

Page 14: ...13 MEMO ...

Page 15: ...14 4 Exploded Views and Parts List 4 1 Indoor Unit 10 14 2 14 1 20 19 18 17 12 13 15 16 8 1 8 2 6 5 3 1 2 8 9 4 4 1 4 2 4 3 7 14 14 3 11 11 1 11 3 11 2 21 ...

Page 16: ...N FILTER CLEANER FILTER COVER TERMINAL ASS Y FRONT PANEL ASS Y PCB DISPLAY ASS Y TRAY DRAIN ASS Y STEPING MOTOR BLADE H ASS Y EVAP ASS Y EVAP SPACER EVAP ASS Y HOLDER MOTOR HOLDER MOTOR CLIP EARTH WIRE TERMINAL BLOCK ASS Y MOTOR FAN IN ASS Y C F FAN ASS Y HOLDER BEARING RUBBER BEARING HOLDER BEARING BEARING ASS Y MAIN PCB ASS Y TERMISTOR CASE CONTROL ASS Y BACK BODY HOLDER PIPE PLATE HANGER Transf...

Page 17: ...8 16 17 7 6 11 1 4 3 2 5 10 12 13 1 15 15 4 15 5 15 3 15 2 15 1 14 14 1 13 19 14 2 16 4 2 Outdoor Unit 4 2 1 US18A2QC 18 2 18 3 18 1 18 9 12 3 12 4 12 2 12 1 12 ...

Page 18: ...190IV2E7 EPDM M8 PIO 8 NORYL ASS Y 10LT MIN ASS Y C1220T H 1 4 INCH ASS Y 45CG20ALB 40 2 5 450V 5P 20A 2A 250V 4P C3771BD C3771BD C1220T 0 1 1 1 1 1 1 1 1 1 1 1 1 3 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Description Specification Remark Q TY US18A2QC 1 2 3 4 5 6 7 8 9 10 11 12 12 1 12 2 12 3 12 4 13 13 1 14 14 1 14 2 15 15 1 15 2 15 3 15 4 15 5 16 17 18 1 18 2 18 3 19 DB90 00033A DB90 20160D DB67...

Page 19: ...18 4 2 2 US24A2QC 8 16 17 7 6 11 1 4 3 2 5 10 12 13 1 15 15 4 15 5 15 3 15 2 15 1 14 14 1 13 19 14 2 18 2 18 3 18 1 18 9 ...

Page 20: ...0073T SC 90073T H25B26QABCA ASS Y 20LT MIN 5 8 ASS Y C1220T H 1 4 INCH ASS Y 45CG20ALB 3 0 35µF X 370VAC 5P 20A 2A 250V 4P Rubber 6000 C3771BD C3771BD 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Description Specification Remark Q TY US24A2QC 1 2 3 4 5 6 7 8 9 10 11 12 13 13 1 14 14 1 14 2 15 15 1 15 2 15 3 15 4 15 5 16 17 18 1 18 2 18 3 19 DB90 10634A DB90 20210A DB67 50074A DB60 200...

Page 21: ...NO DB61 10163A DB93 10553C DB32 10008E DB93 10599B DB26 10065B Description CASE CONTROL Ass y main PCB Ass y Thermistor Ass y PCB Display Transformer Specification PD S18B1Q 02 103AT 240 240 ASS Y AC230V DC17 Q TY AS24A2QC AS18A2QC 1 1 1 1 1 1 1 1 1 1 Remark ...

Page 22: ...peller fan Compressor T1 T2 Cooling Refrigerating cycle temperature and pressure STD Pressure Piping Temp F Use Temp Condition F MODEL Operating Condition psi T1 T2 Indoor Outdoor 3 Way Valve DB WB DB WB Standard 57 71 46 54 46 54 80 67 95 75 AS24A1QC Cooling Max over load 80 67 115 75 Low temp 67 57 67 57 Standard 64 78 50 54 50 54 80 67 95 75 AS18A1QC Cooling Max over load 80 67 115 75 Low temp ...

Page 23: ...22 6 PCB Diagrams 6 1 Main PCB DB93 10553C AS24A2QC AS18A2QC ...

Page 24: ...F FST 250V 3 15A FH 51H 7 5A KA7812A AL H25 M3 6 FeFzY KA7805A CQS 450V 1 2µF LSAO5230P 250V 2A 23mH 2 RD 1 2 T S 621 J RD 1 4 TP 332 J RD 1 4 TP 103 J RD 1 4 TP 331 J RD 1 4 TP 102 J RD 1 4 TP 560 J RD 1 2 T S 102 J RD 1 4 TP 682 J RD 1 8 TP 332 J RD 1 4 TP 682 F 1N4007 G3MB 202PL CBE 2220BA STICK CA OA 50V 103Z CA OA 50V 102Z CA OA 50V 104Z CE04 25V 222 M CE 04 25V 471 M CE 04 35V 102 M 47 50V M...

Page 25: ...24 7 Wiring Diagrams 7 1 Indoor Unit ...

Page 26: ... 52C MAGNETIC CONTACTOR TB 1 2 TERMINAL BLOCK C1 CAPACITOR FM FAN MOTOR F FUSE 2A 250V S SPARK KILLER MARK NAME MARK NAME 52C MAGNETIC CONTACTOR TB 1 2 TERMINAL BLOCK C1 CAPACITOR FM FAN MOTOR F FUSE 2A 250V S SPARK KILLER US24A2QC US18A2QC ...

Page 27: ...27 ...

Page 28: ...ELECTRONICS ...

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