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Samsung UQ18A0RCD Service Manual Download Page 10

9

3-2-2  When the Indoor Unit Fan Does Not Operate. (Initial Diagnosis)

1) Checklist :

(1) Is the indoor unit fan motor properly connected with the connector (CN73)?
(2) Is the AC voltage correct?
(3) Is HALL IC in indoor fan motor properly connected with the connector (CN43)?
(4) Is the running capacitor properly connected with the solder part of the PCB?

2) Troubleshooting procedure

After unplugging 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 to page 8.

Microcomputer is out of order.

PCB is

out of order.

Refer to replace 

PCB module

Replace MFC

Fan motor

should be replaced.

Fan motor

is out of order.

MF-C is out of order

YES

-

Test rod location

+

SS71+

SS71-

12V

Normal

Voltage

.

.

 DB81-00188A(4)-1**  10/30/02 10:44 AM  Page 9

Summary of Contents for UQ18A0RCD

Page 1: ...y 3 Troubleshooting 4 Exploded Views and Parts List 5 Refrigerating Cycle Block Diagrams 6 Wiring Diagrams 7 Schematic Diagrams ROOM AIR CONDITIONER INDOOR UNIT AQ24A2RC AQ18A6RC AQ18A0RCD OUTDOOR UNIT UQ24A2RC UQ18A6RC UQ18A0RCD E DB81 00188A 4 1 00188A 4 CO 10 30 02 10 43 AM Page 1 ...

Page 2: ...y 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 regular 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 valve disconnect the ...

Page 3: ...e 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 way valve 3 Set the un...

Page 4: ...t 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 three fixing screws of front grille 7 Pull the upper left right and center 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 fix the hook...

Page 5: ... upper side out Inclusion Power cord 3 Separate the outdoor unit connection wire from the terminal block 4 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 screws of left side 6...

Page 6: ...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 DB81 00188A 4 1 10 30 02 10 44 AM Page 5 ...

Page 7: ... 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 DB81 00188A 4 1 10 30 02 10 44 AM Page 6 ...

Page 8: ...s 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 a phenomenon that the compressor is reoperated after a delay of 3 minutes the indoor fan is adjusted automatically with reference to a temperature of the air ble...

Page 9: ... normal Is voltage at 33 terminal of the Micom normal 0VDC Is voltage at 18 terminal of the Micom normal 5VDC Is the input rating 10 range applied to the between 1 and 3 of CN78 Check linkage between power cord and terminal tap Check fuse Is 11 12 5VAC appear in the input side of the DC regulator IC KA7805 ICO2 Refer to replace PCB Module YES NO YES NO YES YES YES NO YES YES YES DC5V 10ms 10ms 100...

Page 10: ... 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 to page 8 Microcomputer is out of order PCB is out of order Refer to re...

Page 11: ...S YES NO NO NO NO NO YES NO Outdoor unit is out of order Power relay is out of order Power relay should be replaced Refer to replace PCB module 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 8 YES Is the room sensor normal register 25 C 10KΩ 10 C 20 C 30 C 17 96kΩ 12 09kΩ 8 3kΩ Do...

Page 12: ...om IC04 is faulty Normal Check as in the procedure No Power parts Refer to page 8 3 2 5 In the mode When there is no warm air current Check this first 1 Is the set temperature of Remote Control lower than room temperature in Heat mode 2 Is the Indoor PCB properly connected with the CN78 connector After training on the heating operation should start in five minutes Is the mumber 7 of Micom IC04 DC ...

Page 13: ...23Y 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 is faulty NO NO NO NO NO NO YES YES...

Page 14: ...e PCB module Remove power cord Replace the PCB module Check the connection and plug in Refer to set up the Model option Does al display lamp blink or STD lamp blink YES NO Replace another PCB module DB81 00188A 4 1 10 30 02 10 44 AM Page 13 ...

Page 15: ...1 2 4 5 7 1 6 6 1 20 10 3 10 1 10 2 21 14 16 11 12 13 9 8 13 1 17 18 19 10 15 7 2 3 2 3 3 3 1 3 7 14 4 Exploded Views and Parts List 4 1 Indoor Unit DB81 00188A 4 1 10 30 02 10 44 AM Page 14 ...

Page 16: ... TRAY DRAIN ASS Y STEPING MOTOR BLADE H ASS Y EVAP ASS Y EVAP SPACER EVAP ASS Y HOLDER MOTOR 24K ASS Y HOLDER MOTOR 18K HOLDER MOTOR CLIP EARTH WIRE TERMINAL BLOCK ASS Y MOTOR FAN IN ASS Y C F FAN RUBBER BEARING BEARING MOTOR ASS Y MAIN PCB ASS Y MAIN PCB ASS Y TERMISTOR CASE CONTROL ASS Y BACK BODY ASS Y HOLDER PIPE PLATE HANGER COVER TERMINAL BLOCK PLATE KNOCKOUT HIPS PP ASS Y PP POLYESTER CARBO...

Page 17: ...16 4 2 Outdoor Unit 4 2 1 24K BTU 5 6 3 2 1 4 11 16 7 13 2 13 8 14 3 14 10 9 15 4 15 1 15 15 5 15 3 15 2 13 1 15 6 12 12 1 12 2 17 2 17 1 17 3 DB81 00188A 4 1 10 30 02 10 44 AM Page 16 ...

Page 18: ...0073T SC 90073T H29B26UABCA CR M8 ASS Y P TYPE RANCO V269205 ASS Y ASS Y 41NB21AG 35µFx450VAC 8P 2A 250V 4µF 450VAC PP C3771BD C3771BD 1 1 1 1 1 1 1 1 1 1 1 1 4 4 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 Description Specification Q TY UQ24AZRC 1 2 3 4 5 6 7 8 9 10 11 12 12 1 12 2 13 13 1 13 2 14 15 15 1 15 2 15 3 15 4 15 5 15 6 16 17 1 17 2 17 3 DB90 00652P DB90 20210A DB67 50074A DB60 20020A DB31 00027F DB9...

Page 19: ...18 4 2 2 18K BTU AQ18A RC 2 5 3 4 6 7 16 8 10 9 1 11 12 1 12 2 12 12 4 12 3 15 1 15 5 15 4 14 15 15 6 15 3 15 2 15 7 13 1 13 12 5 17 3 17 2 17 4 17 1 DB81 00188A 4 1 10 30 02 10 44 AM Page 18 ...

Page 20: ...A RCD 2 5 3 4 6 7 16 8 10 9 1 11 12 1 12 2 12 12 4 12 3 14 13 1 13 12 5 15 15 2 15 1 15 3 15 5 15 4 15 6 15 7 If you need a receiver install it at this point In case of AQ18A0RCD the capacity is 255cc DB81 00188A 4 1 10 30 02 10 44 AM Page 19 ...

Page 21: ...LK M8 M5 PBT GRY 240V 45W ASS Y ASS Y P TYPE ASS Y ASS Y ASS Y ASS Y UZ 2A BB220 25A 40 450VAC 8P 20A 8P 20A ASS Y 2A 250V 2 5uF 450VAC PW 2N PP CR C3771BD C3771BD 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 2 2 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 2 2 Description Specification Q TY UQ18A6RC UQ18A0RCD 1 2 3 4 5 6 7 8 9 10 11 12 12 1 12 2 12 3 12 4 12 5 13...

Page 22: ...4 1 2 5 3 No 1 2 3 4 5 Description ASS Y MAIN PCB ASS Y THERMISTOR ASS Y PCB DISPLAY CASE CONTROL COVER DISPLAY Specification PD SH30ZC 02 103AT 240 240 ASS Y ABS ABS Q TY 1 1 1 1 1 Remark DB81 00188A 4 1 10 30 02 10 44 AM Page 21 ...

Page 23: ...22 MEMO DB81 00188A 4 1 10 30 02 10 44 AM Page 22 ...

Page 24: ...DB WB DB WB Standard 57 71 46 54 46 54 80 67 95 75 Cooling Max over load 80 67 115 75 AQ24A2RC Low temp 67 57 67 57 Standard 270 327 90 97 140 158 70 59 47 43 Heating Max over load 80 75 65 Low temp 70 59 35 33 Standard 64 78 46 54 46 54 80 67 95 75 Cooling Max over load 80 67 95 75 AQ18A6RC Low temp 67 57 67 57 Standard 270 327 90 97 140 158 70 59 47 43 Heating Max over load 80 75 65 Low temp 70 ...

Page 25: ...24 6 PCB Diagrams 6 1 Main PCB PD SH30ZC 02 DB81 00188A 4 1 10 30 02 10 45 AM Page 24 ...

Page 26: ... 501 502 601 604 606 902 R CARBON 10KOHM 5 1 8W AA TP 1 8X3 2MM 7 31 R201 207 208 401 403 408 603 605 608 R CARBON 1KOHM 5 1 8W AA TP 1 8X3 2MM 9 32 R910 911 912 913 R CARBON 3 3KOHM 5 1 8W AA TP 1 8X3 2MM 4 33 R102 103 R CARBON 330KOHM 5 1 4W AA TP 2 4X6 4MM 2 34 R106 901 R CARBON 4 7KOHM 5 1 8W AA TP 1 8X3 2MM 2 35 R607 R CARBON 560OHM 5 1 4W AA TP 2 4X6 4MM 1 36 R402 R CARBON 6 8KOHM 5 1 8W AA ...

Page 27: ...26 7 Wiring Diagrams 7 1 Indoor Unit AQ24A2RC AQ18AORCD AQ18A6RC DB81 00188A 4 1 10 30 02 10 45 AM Page 26 ...

Page 28: ...OR TB 1 2 TERMINAL BLOCK 20C SOLENOID COIL CH CRANK CASE HEATER C1 CAPACITOR FM1 FAN MOTOR F FUSE 2A 250V S SPARK KILLER DIAGRAM OUTDOOR MARK NAME MARK NAME 52C MAGNETIC CONTACTOR TB1 2 TERMINAL BLOCK 20S SOLENOID COIL FM1 FAN MOTOR F FUSE S SPARK KILLER DB81 00188A 4 1 10 30 02 10 45 AM Page 27 ...

Page 29: ...28 UQ18AORCD DIAGRAM OUTDOOR MARK NAME MARK NAME PR POWER RELAY TB1 2 TERMINAL BLOCK 20S SOLENOID COIL FM1 FAN MOTOR F FUSE 2A 250V S SPARK KILLER DB81 00188A 4 1 10 30 02 10 45 AM Page 28 ...

Page 30: ...29 MEMO DB81 00188A 4 1 10 30 02 10 45 AM Page 29 ...

Page 31: ...31 30 8 Schematic Diagrams 8 1 Indoor Unit DB81 00188A 4 1 10 30 02 11 00 AM Page 30 ...

Page 32: ...32 MEMO DB81 00188A 4 1 10 30 02 10 45 AM Page 32 ...

Page 33: ...ELECTRONICS 1 00188A 4 CO 10 30 02 10 43 AM Page 2 ...

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