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  5. Service Manual

Samsung AC026JXSCEH Service Manual

Manual is about: System Air Conditioner

Summary of AC026JXSCEH

  • Page 1

    Refer to the service manual in the gspn(see the rear cover) for the more information. Air conditioner contents system air conditioner 1. Precautions 2. Product specifications 3. Disassembly and reassembly 4. Troubleshooting 5. Pcb diagram 6. Wiring diagram 7. Reference sheet ac026knadeh ac035knadeh ...

  • Page 2: Contents

    Contents 1 1. Precautions ........................................................................................................................................ 1-1 1-1 precautions for the service ........................................................................................................

  • Page 3

    4-4-9 o.C(over current) error ....................................................................................................................... 4-29 4-4-10 dc_link voltage sensor error .......................................................................................................... 4-...

  • Page 4: 1. Precautions

    Samsung electronics 1-1 1. Precautions 1-1 precautions for the service use the standard parts when replacing the electric parts. – confirm the model name, rated voltage, rated current of the electric parts. When repairing the equipment, connection of the harness parts must be firm and solid. – a loo...

  • Page 5

    1-2 samsung electronics 1-3 precautions related to product safety do not pull the power cord and do not touch the power plug or aux power switch with wet hands. – it might cause electric shock or fire. A damaged power line or power plug must be replaced to prevent danger. Do not bend the power cable...

  • Page 6: 2. Product Specifications

    Samsung electronics 2-1 built-in cassette type after installed, the air conditioner can be harmonized with a room interior. High performance & energy saving with the advanced bldc inverter technology, it makes a room cool with highly energy saving and arises the efficiency of air conditioner. Long a...

  • Page 7

    2-2 samsung electronics item ac026knadeh/eu ac026jxsceh/eu ac035knadeh/eu ac035jxsceh/eu image indoor unit outdoor unit remote controller power product 1Φ, 220-240v/50hz 1Φ, 220-240v/50hz indoor l x h x d mm 896*261*261 896*261*261 outdoor l x h x d mm 790*285*548 790*285*548 indoor product kg(net) ...

  • Page 8

    Samsung electronics 2-3 item ac071knadeh/eu ac071jxsceh/eu image indoor unit outdoor unit remote controller power product 1Φ, 220-240v/50hz indoor l x h x d mm 1063*317*294 outdoor l x h x d mm 940*330*1420 indoor product kg(net) 18.0 outdoor product kg(net) 96.0 capacity cooling(std) w 7100 heating...

  • Page 9

    2-4 samsung electronics item description code no. Q’ty remark remote control db93-15882h 1 essential offer (indoor unit) batteries for remote control 4301-000121 2 user’s & installation manual db68-06253a db68-06254a 1/1 remote control holder db61-06087a 1 m4 x 16 tapped screws 6002-000234 2 cap scr...

  • Page 10

    Samsung electronics 3-1 item remarks +screw driver adjustable wrench (8mm, 10mm, 13mm) m6, m8 hex wrench necessary tools 3. Disassembly and reassembly.

  • Page 11

    3-2 samsung electronics 3-1 indoor unit ac026knadeh / ac035knadeh / ac071knadeh no parts procedure remark 1 panel-front 1) stop the driving of air conditioner and shut off main power supply. 2) detach filter pre from the panel front. 3) cover panel is assembled on bottom of indoor unit as shown in t...

  • Page 12

    Samsung electronics 3-3 no parts procedure remark 4) cover panel is fixed to body by hook in center area and side area. 5) separate the hook after pushing both end of cover panel as shown in the figure. (watch out for the damage of the hook) 6) raise front part upward obliquely as shown in the figur...

  • Page 13

    3-4 samsung electronics no parts procedure remark caution: assembly of cover panel after service end. - reassembly is in the reverse order of the removal. - piping and drain hose must be careful not to damage and progress must be done with both hands. Hook (side) hook (center) screw cap screw.

  • Page 14

    Samsung electronics 3-5 no parts procedure remark 7) to detach the panel-front from the main frame, unfasten 2 screws at the bottom. (use + screw driver) 8) to detach the cover-panel from the main frame, loosen 4 hook structures. When separate the hook : use the (-) screw driver. (-)screw driver ins...

  • Page 15

    3-6 samsung electronics no parts procedure remark 9) remove the panel frame from the main frame as shown on the right side..

  • Page 16

    Samsung electronics 3-7 no parts procedure remark 2 contorl in 1) lossen sub pba wire. Caution: when you separate the connector, pull pressing the locking button. 2) lossen stepping motor, eev, display, sensor, spi, fuse wire. Caution: when you separate the connector, pull pressing the locking butto...

  • Page 17

    3-8 samsung electronics no parts procedure remark 5 evaporator 9) take off the case-control from the main frame after loosen the remaining connector. Caution: when you separate the connector, pull pressing the locking button. 3 tray drain 1) to detach tray-drain from the main frame, pull the bottom ...

  • Page 18

    Samsung electronics 3-9 no parts procedure remark 4 evaporator 1) detach the holder pipe. 2) unfasten the screw at the left side. (use + screw driver) 3) unfasten the screw at the right side. (use + screw driver) 4) to detach evaporator from the main frame, pull the bottom of the evaporator towards ...

  • Page 19

    3-10 samsung electronics no parts procedure remark 5 fan motor & cross fan 1) unfasten the screw. (use + screw driver) 2) detach the fan motor case. 3) unfasten the screw a little. (use + screw driver) 4) pull the cross-fan to the left side..

  • Page 20

    Samsung electronics 3-11 ac026jxsceh / ac035jxsceh no parts procedure remark 1 common work 1) loosen 1 pcs screw of cover control,and detach it. 2) loosen 5 pcs screws on both right and left cabinet side edges and to detach the cover-top 3) loosen 7 screws fixed to disassemble cabi-front , and detac...

  • Page 21

    3-12 samsung electronics no parts procedure remark common work 4) loosen 7 screws to disassemble the cabi- right ,and detach it. 5) loosen 2 screws to disassemble steel-bar. 6) loosen 3 screws to disassemble cabi-left..

  • Page 22

    Samsung electronics 3-13 no parts procedure remark 2 fan&motor 1) loosen 1 screw as indication and detached the fan. 2) loosen 4 pcs motor screws and disconnect the wire between assy control out and motor. 3) loosen 2 pcs bracket-motor screw and detach it..

  • Page 23

    3-14 samsung electronics no parts procedure remark 3 assy control out 1) loosen fixing 1 screw from cover -control 2) detach several connections from assy con- trol out, take out assy control out. 4 heat exchanger 1) release the refrigerant at first 2) loosen fixing screw on both side. 3) disassembl...

  • Page 24

    Samsung electronics 3-15 no parts procedure remark 5 compressor 1) disconnect the compressor lead wire . 2)disassembly the felt comp sound. Loosen the 3 bolts at the bottom of compres sor..

  • Page 25

    3-16 samsung electronics ac071jxsceh no parts procedure remark 1 cabi front rh you must turn off the power before disassembly. 1) unscrew and remove two mounting screw in the cabinet front rh. (use +screw driver) 2 cabi top 1) unscrew and remove 9 screws on each side of the cabinet-top. (use +screw ...

  • Page 26

    Samsung electronics 3-17 no parts procedure remark 5 cabi back rh 1) pull the sensor from cabi back rh. 2) unscrew and remove 4 screws on each side of the cabinet back rh. (use +screw driver) 6 cabi install back 1) unscrew and remove 1 screw in the cabinet-install back. (use +screw driver) 7 cabi fr...

  • Page 27

    3-18 samsung electronics no parts procedure remark 8 fan 1) unscrew and remove 3 screws in the ass'y fan propeller-total. (use +screw driver) 2) remove the cover from the fan propeller 3) turn 2 mounting nuts as shown in the picture and remove it. (use adjustable wrench) when you assemble the fan pr...

  • Page 28

    Samsung electronics 3-19 no parts procedure remark 9 motor 1) separate the fan propeller. 2) unscrew and remove the 8 motor mounting screws. (use +screw driver) 3) disconnect the motor wire from ass'y control out. 10 bracket motor 1) unscrew and remove 2 mounting screws in bracket motor. (use +screw...

  • Page 29

    3-20 samsung electronics no parts procedure remark 12 control out 1) disconnect 4 connecters from ass'y control out. 2) unscrew and remove 1 mounting screw in control out. (use +screw driver) 3) separate ass'y control out. 13 assy 4way valve 1) purge the coolant first. 2) unscrew and remove 2 mounti...

  • Page 30: 4. Troubleshooting

    Samsung electronics 4-1 4. Troubleshooting step 1. Entering mode to set option 1. Remove batteries from the remote controller. 2. Insert batteries and enter the option setting mode while pressing high temp button and low temp button . 3. Check if you have entered the option setting status. Step 2. T...

  • Page 31

    4-2 samsung electronics option setting status 1. Setting seg2, seg3 option press low fan button(∨) to enter seg2 value. Press high fan button(∧) to enter seg3 value. Each time you press the button,  …  will be selected in rotation. 2. Setting cool mode press mode button to be changed to cool mode...

  • Page 32

    Samsung electronics 4-3 option setting status 12. Setting cool mode press mode button to be change to cool mode in the off status. 13. Setting seg16, seg17 option press low fan button(∨) to enter seg16 value. Press high fan button(∧) to enter seg17 value. Each time you press the button,  …  will ...

  • Page 33

    4-4 samsung electronics 1. Check whether power is supplied or not. - when the indoor unit is not plugged in, there should be additional power supply in the indoor unit. 2. The panel(display ) should be connected to an indoor unit to receive option. 3. Before installing the indoor unit, assign an add...

  • Page 34

    Samsung electronics 4-5 1. Check whether power is supplied or not. - when the indoor unit is not plugged in, there should be additional power supply in the indoor unit. 2. The panel(display ) should be connected to an indoor unit to receive option. 3. Set the installation option according to the ins...

  • Page 35

    4-6 samsung electronics option seg19 seg20 seg21 seg22 seg23 seg24 explanation page individual control of a remote controller heating setting compensation reserved reserved reserved indication and details indication details indication details indication details 3 0 or 1 indoor 1 0 disuse 2 indoor 2 ...

  • Page 36

    Samsung electronics 4-7 you can change each digit of set option. Changing a particular option option seg1 seg2 seg3 seg4 seg5 seg6 explanation page mode the option mode you want to change the tens’ digit of an option seg you will change the unit digit of an option seg you will change the changed val...

  • Page 37

    4-8 samsung electronics abnormal condition error code led display error on indoor temperature sensor (short or open) e121 1. Error on eva-in sensor (short or open) 2. Error on eva-out sensor (short or open) 3. Discharge sensor error (short or open) e122 e123 e126 indoor fan error e154 1. Error on ou...

  • Page 38

    Samsung electronics 4-9 4-2 troubleshooting for outdoor unit if an error occurs during the operation, it is displayed on the outdoor unit pcb led, both main pcb and inverter pcb. No. Error code meaning remarks 1 e201 unit quantity miss matching between indoor and outdoor. Check indoor quantity setti...

  • Page 39

    4-10 samsung electronics indoor unit display symptom in case of open or short circuit of indoor temperature sensor failure short or leakage of the corresponding sensor yes no no in this case, is the resistance value out of range in the temperature table on the right? Yes is indoor temperature sensor...

  • Page 40

    Samsung electronics 4-11 yes no no in this case, is the resistance value out of range in the temperature table on the right? Yes is the indoor heat exchanger temperature sensor connector disconnected from the pcb? Restart the system after replacing the pcb restart the system after connecting the con...

  • Page 41

    4-12 samsung electronics indoor unit display symptom indoor unit fan does not run /runs at excessive high speed and stops failure check if the motor connector is disconnected/ check the motor fan assembly status 4-3-3 indoor fan error yes no yes is there foreign substance stuck in the motor fan? Yes...

  • Page 42

    Samsung electronics 4-13 indoor unit display symptom communication error between the indoor and outdoor unit for two minutes failure communication error between the indoor unit and outdoor unit 4-3-4 communication error after finishing tracking no yes no yes is there a response from the indoor pcb? ...

  • Page 43

    4-14 samsung electronics indoor unit display symptom the indoor unit floating sensor is open and that state is maintained for more than one minute failure increase in the drain pan water level due to failure of the indoor unit drain pump, or float sensor failure 4-3-5 indoor unit float sensor error ...

  • Page 44

    Samsung electronics 4-15 restart the unit after replacing the pcb indoor unit display symptom eeprom circuit failure failure eeprom component failure, eeprom circuit parts missing/damaged/soldering failure 4-3-6 eeprom circuit failure no yes are the eeprom circuit components in good conditions? (mis...

  • Page 45

    Samsung electronics 4-16 4-3-7 outdoor unit is not powered on – initial diagnosis 1. Check items 1) is the power supply voltage 220v? 2) is the ac power connected correctly? 3) are the leds in the main pcb and inverter pcb of the outdoor unit on? 4) is the input power voltage of the indoor unit 220v...

  • Page 46

    Samsung electronics 4-17 yes outdoor unit is not powered on – initial diagnosis (cont.) yes connect the reactor no is the reactor connector connected correctly? Replace the pba. Cont..

  • Page 47

    4-18 samsung electronics 4-4-1 communication error 1. 1.Checklist : 1) is the cable between the indoor unit and outdoor unit connected correctly? 2) isn't the power cable and communication cable cross? 2. Troubleshooting procedure yes restart after power off. Terminate the service exchange the indoo...

  • Page 48

    Samsung electronics 4-19 4-4-2 outdoor temperature sensor error 1. 1.Checklist : 1) is the cable between the indoor unit and outdoor unit connected correctly? 2) is the sensor placed correctly? 3) does the both terminal of sensor satisfy the resistance value in accordance with temperature? 4) is the...

  • Page 49

    4-20 samsung electronics 4-4-2-2. Troubleshooting procedure (pf3) yes reconnect the sensor connector. Micom error or connector check no is the sensor resistance value #1-#2 10kohm±3% at the room temperature of 25 °c is the sensor connector(cn502) connected correctly in accordance with a colorred,4pi...

  • Page 50

    Samsung electronics 4-21 4-4-3 outdoor coil temperature sensor error 1.Checklist : 1) is the sensor connected correctly? 2) is the sensor placed correctly? 3) does the both terminal of sensor satisfy the resistance value in accordance with temperature? 4) is the resistance value of sensor connection...

  • Page 51

    4-22 samsung electronics 4-4-3-2. Troubleshooting procedure (pf3) yes reconnect the sensor connector. Micom error or connector check no is the sensor resistance value #3-#4 (cn501) 10kohm±3% at the room temperature of 25 25 °c is the sensor connector(cn501) connected correctly in accordance with a c...

  • Page 52

    Samsung electronics 4-23 4-4-4 outdoor discharge temperature sensor error 1.Checklist : 1) is the sensor connected correctly? 2) is the sensor placed correctly? 3) does the both terminal of sensor satisfy the resistance value in accordance with temperature? 4) is the resistance value of sensor conne...

  • Page 53

    4-24 samsung electronics sensor replace sensor resistance value : 20 °c - 242kohm 30 °c - 166ohm 35 °c - 138ohm 40 °c - 115kohm 4-4-4-2. Troubleshooting procedure (pf3) yes reconnect the sensor connector. Micom error or connector check no is the sensor resistance value #3-#4 (cn501) 10kohm±3% at the...

  • Page 54

    Samsung electronics 4-25 4-4-5 outdoor discharge over temperature error 1.Checklist : 1) check the discharge temperature in the outdoor unit 2) check the compressor locking or gas leak 3) 3) download the eeprom data 2. Troubleshooting procedure yes yes terminate the service exchange the outdoor pba ...

  • Page 55

    4-26 samsung electronics 4-4-6 outdoor fan motor error 1.Checklist : 1) are the input power voltage and the power connection correct? 2) is the motor wire connected to the outdoor pba correctly? 3) is there no assembly error or none-assembly in the terminal of motor wire connector? 4) is there no ob...

  • Page 56

    Samsung electronics 4-27 4-4-7 compressor starting error 1.Checklist : 1) is the connection of cable for the compressor? 2) is the compressor wire is connected clockwise? U(red)-v(blu)-w(yel) 3) is the interphase resistance of compressor normal? 2. Troubleshooting procedure terminate the service dow...

  • Page 57

    4-28 samsung electronics 4-4-8 compressor wire missing error/rotation error 1.Checklist : 1) is the connection of cable for the compressor? 2) is the compressor wire is connected clockwise? U(red)-v(blu)-w(yel) 3) is the interphase resistance of compressor normal? 2. Troubleshooting procedure termin...

  • Page 58

    Samsung electronics 4-29 4-4-9 o.C(over current) error 1.Checklist : 1) is the ipm shunt(pf2:r451,r452,r453,pf3:r413,r414,r415) resistance value correct? Check the resistor is opened 2) is the condition of surrounding temperature abnormal overload? 3) is there any problem as like the temperature sen...

  • Page 59

    4-30 samsung electronics 4-4-10 dc_link voltage sensor error 1.Checklist : 1) is the input voltage of outdoor terminal block is normal? 2) is the reactor wire connected? 3) is the dc_link capacitor(pf2:ce101,ce102,ce103,pf3:ce001,ce002,ce003,ce004)) assembled in accordance the specification? (outdoo...

  • Page 60

    Samsung electronics 4-31 4-4-11 dc_link voltage under/over error, over voltage protection error/pfc over load 1.Checklist : 1) is the input voltage of outdoor terminal block is normal? 2) is the reactor wire connected? 3) is the reactor wire connected? 4) is the dc_link capacitor(pf2:ce101,ce102,ce1...

  • Page 61

    4-32 samsung electronics 4-4-12 dc_link voltage sensor error 1.Checklist : 1) is the pfc shunt(pf2:r062,r063,pf3:r807,r808,r809) resistance value correct? Check the resistor is opened 2) is the condition of surrounding temperature abnormal overload? 3) is there any problem as like the temperature se...

  • Page 62

    Samsung electronics 4-33 4-4-13 current sensor error/input current sensor error 1.Checklist : 1) is the pfc shunt(pf2:r062,r063,pf3:r807,r808,r809) resistance value correct? Check the resistor is opened 2) is the ipm shunt(pf2:r451,r452,r453,pf23:r413,r414,r415) resistance value correct? Check the r...

  • Page 63

    4-34 samsung electronics 4-4-14 heatsink sensor error/heatsink over heat 1.Checklist : 1) are there screws assembly in pba-heatsink? 2) is the gap pba-heatsink 3) is the fan operation normal? 4) is the cover assembly in control-box normal? 2. Troubleshooting procedure fastening the screw no are ther...

  • Page 64

    Samsung electronics 4-35 4-4-15 comp vlimit error/comp current limit error 1.Checklist : 1) is the pfc shunt(pf2:r062,r063,pf3:r807,r808,r809) resistance value correct? Check the resistor is opened 2) is the condition of surrounding temperature abnormal overload? 3) is there any problem as like the ...

  • Page 65

    4-36 samsung electronics 4-4-16 eeprom error/otp error 1.Checklist : 1) is there a short around micom? 2) is there a short around ic202(pf2) or ic701(pf3)? 3) did you download or insert eeprom ic, after changing outdoor pba? 2. Troubleshooting procedure terminate the service no restart after power o...

  • Page 66

    Samsung electronics 4-37 4-4-17 ac zero cross signal error 1.Checklist : 1) check the power condition at customer's house (is there any power noise?) 2) have been there power failure? 2. Troubleshooting procedure terminate the service no is the ac line zero cross signal error appeared again? Exchang...

  • Page 67

    4-38 samsung electronics 4-4-18 operation condition secession error 1.Checklist : 1) check the temperature around the outdoor unit. 2. Troubleshooting procedure terminate the service no is the operation condition secession error appeared again? * heating mode * is the outdoor temperature over 40 °c ...

  • Page 68

    Samsung electronics 4-39 4-4-19 capacity miss match error 1.Checklist : 1) check the btu between indoor and outdoor unit 2) check the indoor unit option and outdoor unit eeprom data 2. Troubleshooting procedure exchange the one of them according to the exact model spec terminate the service terminat...

  • Page 69

    4-40 samsung electronics 4-4-20 gas leak error 1.Checklist : 1) is the position of indoor eva_in sensor normal? 2) check the pipe crack 3) check the eev valve connection in outdoor unit 4) check the refrigerant was charged 2. Troubleshooting procedure indoor sensor take the normal position check the...

  • Page 70: 5. Pcb Diagram

    Samsung electronics 5-1 5. Pcb diagram 5-1 pcb diagram 5-1-1 indoor unit pcb (ac026knadeh / ac035knadeh / ac071knadeh) main pba 4 5 6 7 8 10 8 11 12 13 1 2 3.

  • Page 71

    Samsung electronics 5-2 ① #1 : l #2 : not used #3 : n ② #1~2 : communication signal ③ #1 : dc 310v #2 : not used #3 : gnd #4 : pwm signal #5 : feedback signal ④ #1 : thermal fuse signal #2 : gnd ⑤ #1~2 : gnd #3 : spi control signal #4 : not used ⑥ #1 : dc 12v #2~5 : louver signal ⑦ #1~4 : eev signal...

  • Page 72

    5-3 samsung electronics ■ sub pcb 1 ① #1,#2,#19,#20:comm. Signal #3,#18:external control #4,#17:comp check #5,#16:error check #6:vcc(dc5v) #7,#14:gnd #8,#13,#15:dc12v #9~#12:comm. Signal cn1-2wires comm..

  • Page 73

    Samsung electronics 5-4 5-1-2 outdoor unit pcb outdoor unit pcb(ac026jxsceh / ac035jxsceh) main pcb 1 2 3 4 5 18 6 7 13 15 14 16 17 8 9 10 11 12 no spec. 1 smps power: yw396-03av blu 2 4way:yw396-03av wht 3 reactor:dbt081-2p wht 4 bldc fan:yw396-06v wht 5 comm:yw396-02v red 6 sub pba power:smw200-05...

  • Page 74

    Samsung electronics 5-5 this document can not be used without samsung’s authorization. 20 19 18 17 16 15 13 14 12 11 10 9 8 7 6 5 1 2 3 4 no part code local function description 1 3711-003404 cn703 base-heater yw396-03av blu 2 3711-003406 cn702 4way-1 yw396-03av yel 3 3711-003407 cn701 hotgas yw396-...

  • Page 75

    Samsung electronics 5-6 ① #reactor-a2 : wht #reactor-b2 : wht ② #reactor-a2 : blk #reactor-b2 : blk ③ #1 : rxd, #2 : txd #3 : gnd, #4 : dc 5v #5 : dc 12v, #6 : inv. Smps signal ④ #1 : rxd_ataro, #2 : txd_ataro #3, #8 : n.C, #4~#7 : data signal #9 : gnd, #10 : dc 5v ⑤ for s/w engineer debugging ⑥ #1 ...

  • Page 76

    Samsung electronics 5-7 ① l1 : brn ② n1 : sky-blu ③ #1-#3 : ac 220~240v l1-ac power l phase n1-ac power n phase cn01-ac power 3 1 2 emi pcb this document can not be used without samsung’s authorization..

  • Page 77: 6. Wiring Diagram

    Operating instructions and installation 6-1 samsung electronics this document can not be used without samsung’s authorization. 6. Wiring diagram 6-1 indoor unit.

  • Page 78: 6-2  Outdoor Unit

    Samsung electronics 6-2 this document can not be used without samsung’s authorization. 6-2 outdoor unit ac026jxsceh, ac035jxsceh.

  • Page 79

    Samsung electronics 6-3 ac071jxsceh.

  • Page 80: 7. Preference Sheet

    7-1 samsung electronics 7. Preference sheet model code h d h a h e h eu h/ h 026 h h h ac h k h n product type code type am dvm aj pma ac cac (usd) / asd ae ehs an vtl ak pak (packaged system) ag chr product type code type e 2012 f 2013 g 2014 h 2015 i 2016 j 2017 product type code type s set (nasa)...

  • Page 81

    Samsung electronics 7-2 ■ condenser high temperature and high pressure gas state coolant discharged from the compressor is converted to a liquid state as it is cooled down by the heat emission in the outdoor condenser unit, and sent to the evaporator. ■ compressor low temperature and low pressure co...

  • Page 82

    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. Jun. 2016. Printed in china. Code no. Db68-00000a (1).