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Samsung 4qt12whwb Service Manual

Manual is about: indoor unit and outdoor unit

Summary of 4qt12whwb

  • Page 1

    Indoor unit aqt12whwe outdoor unit uqt12whwe aqt12whwb uqt12whwb service manual contents air conditioner 1. Product specifications 2. Disassembly and reassembly 3. Refrigerating cycle diagram 4. Set up model option 5. Troubleshooting 6. Exploded views and parts list 7. Block diagram 8. Wiring diagra...

  • Page 2: 1. Product Specifications

    1 samsung electronics 1. Product specifications 1-1 table db98_15924a(3)_1 4/6/04 2:59 pm page 1 model item indoor unit outdoor unit indoor unit outdoor unit cooling heating saso l/h m3/h 8.5/9.5 25.0 8.5/9.5 25.0 db 43 55 43 55 cooling heating saso v-hz cooling heating saso cooling heating saso coo...

  • Page 3

    2. Disassembly and reassembly 2-1 indoor unit stop operation of the air conditioner and remove the power cord before repairing the unit. No parts procedure remark 1 front grille 1) stop the air conditioner operation and block the main power. 2) open the front grille by pulling right and left sides o...

  • Page 4

    Disassembly and reassembly no parts procedure remark 2 3 control-in (main pcb) tray drain 6) unlock 2 hooks to fix panel front and tray drain. 7) unlock 3 hooks to fix panel front and back-body. 1) take all the connector of pcb upper side out. (inclusion power cord) 2) detach the outdoor unit connec...

  • Page 5

    Disassembly and reassembly no parts procedure remark 4 5 heat exchanger fan motor & cross fan 1) loosen 2 fixing earth screws of right side. 2) detach the connection pipe. 3) detach the holder pipe at the rear side. 4) loosen the 3 fixing screws of right and left side. 5) lifting the heat exchanger ...

  • Page 6

    2-2 outdoor unit no parts procedure remark 1 common work 1) loosen each 3 fixing screws on both right and left cabinet-side edge and a fixing screw on the cabinet-front lower to detach the cabinet-front. 2) loosen 2 fixing screws of the ass'y-control. 3) loosen 6 fixing screws of the cabinet-side rh...

  • Page 7

    Disassembly and reassembly no parts procedure remark 2 3 4 fan & motor heat exchanger compressor 1) detach the nut flange.(turn counterclock- wise because the screw is right-handed) 2) detach the fan. 3) loosen 4 fixing screws to detach the motor. 1) loosen 2 fixing screws on both sides. 2) disassem...

  • Page 8

    Cooling heating gas leak check polnt indoor unit outdoor unit t 1 t 2 heat exchanger (evaporator) heat exchanger (evaporator) propeller fan cross fan 2-way valve capillary tube capillary tube check valve ✳ note 3-way valve 4-way valve gas side liquid side compressor 3. Refrigerating cycle diagram 3-...

  • Page 9: 4. Set Up The Model Option

    Samsung electronics 8 feature display 4. Set up the model option 4-1 setting option setup method ex) option no. : step 1 : enter the option setup mode. 1 st take out the batteries of remote control. 2 nd press the temperature button simultaneously and insert the battery again. 3 rd make sure the rem...

  • Page 10

    Set up the model option 9 samsung electronics feature display 7 setting option seg5. Push the button to set the display panel to . Every time you push the button, the display panel reads . . . Repeatedly. 6 change it into the set display of option seg5 and seg6 with the button. 8 setting option seg6...

  • Page 11

    Set up the model option samsung electronics 10 step 3 : upon completion of the selection, check you made right selections. Whenever you press the button, the set option will be displayed. Step 4 : pressing the on/off button ( ) when pressing the operation on/off key with the direction of remote cont...

  • Page 12

    11 samsung electronics 4-2 table of the option code model option code seg1 seg2 seg3 seg4 seg5 seg6 seg7 seg8 seg9 seg10 aqt12whwb aqt12whwe 2 5 0 2 5 7 0 3 4 0 2 5 0 2 5 7 0 3 4 0 db98_15924a(3)_1 4/6/04 3:00 pm page 17.

  • Page 13: 5. Troubleshooting

    Samsung electronics 12 check the basic items first to judge if the problem was caused by breakdown or misuse. If none of the basic items are related to the problem, please scrutinize the machine according to the 'breakdown diagnosis by symptoms' method. 1. The input voltage should be rating voltage ...

  • Page 14

    13 samsung electronics 5-2 trouble check in the initial status 5-2-1 diagnosis and marking of the part in trouble. Please check the air conditioner operation status and write the check result in the chart in the room. 5-2-2 operation with abnormal motion indoor unit room temperature sensor error (op...

  • Page 15

    Samsung electronics 14 5-3 breakdown diagnosis by symptoms 5-3-1 no power (completely dead)-initial diagnosis 1. Checklist : 1) is input voltage normal? 2) is ac power linked correctly? 3) is input voltage of dc regulator ic ka7805 (ic02) normal? (11vdc-12.5vdc) 4) is output voltage of dc regulator ...

  • Page 16

    Troubleshooting 15 samsung electronics test rod location + - ss71- ss71- 12v normal voltage 5-3-2 when the indoor unit fan does not operate. (initial diagnosis) 1. Checklist : 1) is the indoor unit fan motor properly connected with the connector (cn72)? 2) is the ac voltage correct? 3) is hall ic in...

  • Page 17

    Troubleshooting samsung electronics 16 test rod location + condition - ic04 pin no.38 ry71 on gnd dc 4.8v normal voltage 5-3-3 when the outdoor unit does not operate. (initial diagnosis) 1. Checklist : 1) is input voltage normal? 2) is the set temperature of the remote control higher than room tempe...

  • Page 18

    Troubleshooting 17 samsung electronics 5-3-4 when the up/down louver motor does not operate. (initial diagnosis) 1. Checklist : 1) is input voltage normal? 2) is the up/down louver motor properly connected with the connector (cn61)? 2. Troubleshooting procedure yes no yes yes remove power cord and p...

  • Page 19

    Troubleshooting samsung electronics 18 5-3-5 in the heat mode, when there is no warm air current. Check this fist; 1. Checklist : 1) is the set temperature of remote control lower than room temperature in heat mode? 2) is the indoor pcb properly connected with the cn71 connector? 2. Troubleshooting ...

  • Page 20

    Troubleshooting 19 samsung electronics 5-3-6 room temperature sensor failure no ass'y sensor replace sensor resistance value : 20˚c-12.09k Ω sensor resistance value : 30˚c-8.31k Ω sensor resistance value : 35˚c-6.94k Ω sensor resistance value : 40˚c-5.83k Ω yes no no detach the assembly sensor from ...

  • Page 21

    Troubleshooting samsung electronics 20 5-3-7 room pipe sensor failure 1. Check the assembly condition of the sensor connector(cn43) on the indoor unit main pcb and if not assembled, reassemble the connector accurately. 2. Detach the room pipe sensor connector(cn43) and check the resistance between c...

  • Page 22

    21 samsung electronics 5-4 pcb inspection method 5-4-1 pre-inspection notices 1. Check if you pulled out the ac power plug when you eliminate the pcb or front panel. 2. Don't hold the pcb side not impose excessive force on it to eliminate the pcb. 3. Don't pull the lead wire but hold the whole housi...

  • Page 23

    Troubleshooting samsung electronics 22 temperature [˚c] sensor resistance [kohm] temperature [˚c] sensor resistance [kohm] temperature [˚c] sensor resistance [kohm] temperature [˚c] sensor resistance [kohm] 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 2.229 2.296 2.365 2.437 2.512 ...

  • Page 24

    23 samsung electronics 5-5 main part inspection method room temperature sensor room fan motor outdoor fan motor stepping motor measure resistance with a tester normal at the normal temperature 37k Ω ~ 8.3k Ω (-7˚c~+30˚c) *refer to table 5-4-4. Abnormal ∞ , 0 Ω . . . Open or short measure the resista...

  • Page 25

    Samsung electronics 24 1 6 1-2 1-1 2-3 2-2 3-7 3-8-1 1-3 1-4 1-6 4 9 7 2-1 2 5-1 5-4 5-2 5 3 8 1-7 1-8 5-3 3-4 3-6 3-8 1-5 3-1 3-2 3-5 3-3 you can search for the updated part code number through the itself. Url : http://itself.Sec.Samsung.Co.Kr 6. Exploded views and parts list 6-1 indoor unit db98_1...

  • Page 26

    25 samsung electronics exploded views and parts list parts list q'ty no. Code no. Description specification remark 1 1 1 1 1 1 1 1 1 - 1 1 - 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 db94-00454b ass'y-back body ass'y 1-1 db61-01632a back-body hips 1-2 db69-00834a cushion-back body eps 1-3 db61-01634...

  • Page 27

    Samsung electronics 26 6-2 outdoor unit 17 3-1 22 3-2 16 10 5 15 8 20 11 12 17-1 17-2 17-7 17-9 17-8 17-5 17-6 13 6 3 1 7 19 18 21 4 19-4 19-3 17-10 19-2 19-1 9 2 14 17-4 17-3 db98_15924a(3)_1 4/6/04 3:00 pm page 36.

  • Page 28

    27 samsung electronics exploded views and parts list ■ parts list q'ty no. Code no. Description specification db98_15924a(3)_1 4/6/04 3:00 pm page 37 aqt12whwb aqt12whwe 1 db90-01341a assy cabi front secc 1 1 2 db63-00847a guard fan pp 1 1 3 db90-01332a assy cabi side lf assy 1 1 3-1 db64-01094a cab...

  • Page 29

    Samsung electronics 28 6-3 ass'y-control in(code no : db93-02481 ) ■ parts list no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 description code no. Case-control ass'y pcb main ass'y terminal block ass'y s/w & module & display pcb plate-control holder-wire clamp screw-machine screw-machine screw-machine connec...

  • Page 30: 7. Block Diagram

    7. Block diagram heat exchanger sensor turbo operation timer temperature* function indoor fan motor (left/right) buzzer compressor outdoor fan motor stepping motor -blade -auto grille* function part display part ic-mcu room temperature sensor controller remote controller infrared signal reset circui...

  • Page 31: 8. Wiring Diagram

    Samsung electronics 30 8. Wiring diagram 8-1 indoor unit this document can not be used without samsung's authorization. Code no : db98-15139a db98_15924a(3)_1 4/6/04 3:00 pm page 42.

  • Page 32

    31 samsung electronics this document can not be used without samsung's authorization. 8-2 outdoor unit c1 motor capacitor fm1 fan motor c2 comp capacitor o.L.P over load protector code no : db98-15607a db98_15924a(3)_1 4/6/04 3:00 pm page 43.

  • Page 33: 9. Schematic Diagram

    Samsung electronics 32 9. Schematic diagram 9-1 indoor unit this document can not be used without samsung's authorization. Db98_15924a(3)_1 4/6/04 3:00 pm page 44.

  • Page 34

    Electronics this service manual is a property of samsung electronics co., ltd. Any unauthorized use of manual can be punished under applicable international and/or domestic law. © samsung electronics co., ltd. Nov. 2004. Code no. Db98-21572a(1) db98_15924a(3)_co 4/6/04 3:16 pm page 2.