Johnson Controls DCX18CSB21S Service Manual Download Page 21

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Technical Information

Service Manual

The above data is subject to change without notice. Please refer to the nameplate of the unit.

DCX24CSB21S

50K

15K

20K

OVERLOAD PROTECTOR

TEMP.SENSOR

OUTTUBE

RT4

MANUAL

ELECTRONIC

EXPANSION

VALVE

FAN MOTOR

COM_INNER

AC_L

YEGN

POWER

L1’

L2’

XT1

BN
BU

RING

MAGNETIC

TERMINAL

BLOCK

Please don't touch any terminal when the

voltage of terminal P(DC+) and N(DC-) at

AP1 is higher than 30V to prevent the

risk of electrical shock!

CONNECTOR

PRINTED CIRCUIT BOARD

YEGN

COMP.

RING

MAGNETIC

TEMP. SENSOR

OUTTUBE

OUTROOM TEMP. SENSOR

TEMP. SENSOR

EXHAUST

T_SENSOR

RT2

RT3

YEGN

AP1

W(RD)

V(YE)

U(BU)

OFAN

OVC_COMP

SAT

YEGN

COMP

EKV

WARNING

RT1

REACTOR

INDC2

INDC1

MAGNETIC

RING

WH(BU)

RD(BN)

GN(YEGN)

BK(BN)
WH(BU)

GN(YEGN)

INDOOR UNI

Summary of Contents for DCX18CSB21S

Page 1: ... UNDERSTAND THIS MANUAL BEFORE USING THIS INVERTER DRIVEN AIR CONDITIONING UNIT KEEP THIS MANUAL FOR FUTURE REFERENCE DHX18CSB21S DCX18CSB21S DHX24CSB21S DCX24CSB21S INDOOR UNIT DHX18NWB21S DCX18NWB21S DHX24NWB21S DCX24NWB21S Type Model 03257 17 OUTDOOR UNIT Model Type DRCPX CONTROLLER Model Type ...

Page 2: ...d advanced information to maintain and service this inverter driven cooling or heat pump air conditioning unit which you operate as well for other models This inverter driven cooling or heat pump air conditioning unit has been designed for a specific temperature range For optimum performance and long life operate this unit within range limits This manual should be considered as a permanent part of...

Page 3: ... Printed Diagram 14 6 Function and Control 17 6 1 Remote Controller Introduction 17 6 2 Brief Description of Modes and Functions 21 8 Maintenance 40 8 1 Precautions before Maintenance 40 8 2 Error Code List 41 8 3 Troubleshooting for Main Malfunction 44 8 4 Troubleshooting for Normal Malfunction 58 9 Removal Procedures 60 9 1 Removal Procedure of Indoor Unit 60 9 2 Removal Procedure of Outdoor Uni...

Page 4: ...tly injuries may occur due to a falling unit Use appropriate Personal Protective Equipment PPE such as gloves and protective goggles and where appropriate have a gas mask nearby Also use electrical protection equipment and tools suited for electrical operation purposes Keep a quenching cloth and a fire extinguisher nearby during brazing Use care in handling rigging and setting of bulky equipment W...

Page 5: ...sure the condensate hose discharges water properly If connected incorrectly it may cause leaks Do not install the unit in any place where oil can seep onto the units such as table or seating areas in restaurants and so forth For these locations or social venues use specialized units with oil resistant features built into them In addition use a specialized ceiling fan designed for restaurant use Th...

Page 6: ...son Controls Johnson Controls uses only refrigerants that have been approved for use in the unit s intended home country or market Johnson Controls distributors similarly are only authorized to provide refrigerants that have been approved for use in the countries or markets they serve The refrigerant used in this unit is identified on the unit s faceplate and or in the associated manuals Any addit...

Page 7: ...gas and liquid valves otherwise these devices will be damaged It is closed before shipment If the arrangement for outdoor units is incorrect it may cause flowback of the refrigerant and result in failure of the outdoor unit The refrigerant system may be damaged if the slope of the piping connection kit exceeds 15o Electrical Precautions Take the following precautions to reduce the risk of electric...

Page 8: ...nel to the indoor or outdoor units without turning OFF the main power supply After ceasing operation be sure to wait at least five minutes before turning off the main power switch Otherwise water leakage or electrical breakdown may result Disconnect the power source completely before attempting any maintenance for electrical parts Check to ensure that no residual voltage is present after disconnec...

Page 9: ...l Information Service Manual 1 Summary Indoor Unit Outdoor Unit Features and Technical Information DHX18CSB21S DCX18CSB21S Controller DRCPX DHX18NWB21S DCX18NWB21S DHX24NWB21S DCX24NWB21S DHX24CSB21S DCX24CSB21S ...

Page 10: ...8NWB21S DHX18NWB21S Fan Type Cross flow Cross flow Diameter Length DXL inch Φ4 1 6X27 13 16 Φ4 1 6X27 13 16 Fan Motor Cooling Speed SH H M L r min 1400 1200 1050 800 1400 1200 1050 800 Fan Motor Heating Speed SH H M L r min 1400 1200 1100 900 Output of Fan Motor W 60 60 Fan Motor RLA A 0 24 0 24 Fan Motor Capacitor μF Evaporator Form Aluminum Fin copper Tube Aluminum Fin copper Tube Pipe Diameter ...

Page 11: ...or Speed rpm 800 800 Output of Fan Motor W 60 60 Fan Motor RLA A 0 49 0 49 Fan Motor Capacitor μF Air Flow Volume of Outdoor Unit CFM 3200 3200 Fan Type Axial flow Axial flow Fan Diameter inch Φ20 15 32 Φ20 15 32 Defrosting Method Automatic Defrosting Automatic Defrosting Climate Type T1 T1 Isolation I I Moisture Protection IP24 IP24 Permissible Excessive Operating Pressure for the Discharge Side ...

Page 12: ... 23 Indoor Unit Model of indoor unit DCX24NWB21S Fan Type Cross flow Diameter Length DXL inch ΦΦ4 1 4X32 7 10 Fan Motor Cooling Speed SH H M L r min 1300 1100 900 850 Fan Motor Heating Speed SH H M L r min Output of Fan Motor W 60 Fan Motor RLA A 0 38 Fan Motor Capacitor μF Evaporator Form Aluminum Fin copper Tube Pipe Diameter inch Φ9 32 Row fin Gap inch 2 1 16 Coil Length LXDXW inch 33 1 4X1X13 ...

Page 13: ...utdoor Unit CFM 4000 Fan Type Axial flow Fan Diameter inch Φ21 21 32 Defrosting Method Automatic Defrosting Climate Type T1 Isolation I Moisture Protection IP24 Permissible Excessive Operating Pressure for the Discharge Side MPa 4 3 Permissible Excessive Operating Pressure for the Suction Side MPa 2 5 Sound Pressure Level H M L dB A 59 Sound Power Level H M L dB A 69 Dimension WXHXD inch 38 37 64X...

Page 14: ...6ft Conditions Indoor DB70 F WB60 F Outdoor DB19 94 F WB19 04 F Indoor air flow Super High Pipe length 24 6ft 2 3 Capacity Variation Ratio According to Temperature Cooling Cooling Heating Heating 4 5 14 110 100 90 80 70 60 50 40 23 32 41 50 Outdoor temp F Capacity ratio 89 6 91 4 93 2 95 96 8 98 6 100 4 102 2 109 4 104 105 8 107 6 100 105 95 90 85 80 75 70 65 60 55 50 Outdoor temp F Capacity ratio...

Page 15: ...dition F DB WB Model Pressure of gas pipe connecting indoor and outdoor unit Inlet and outlet pipe temperature of heat exchanger Fan speed of indoor unit Fan speed of outdoor unit Compressor revolution rps Indoor Outdoor P MPa T1 F T2 F 70 60 19 94 19 04 18K 3 5 3 8 in 167 181 4 out 98 6 113 in 33 8 37 4 out 35 6 42 8 Super High High 75 Instruction T1 Inlet and outlet pipe temperature of evaporato...

Page 16: ...l 3 Outline Dimension Diagram 3 1 Indoor Unit W D H 4 27 7 13 64 5 1 2 7 1 2 1 1 2 1 1 2 Φ2 1 6 Φ2 1 6 3 7 64 6 1 21 32 8 7 64 27 7 21 64 Φ2 3 4 Φ2 3 4 Unit inch 18K 24K Models W H D 18K 38 13 64 11 13 16 8 5 6 24K 42 7 16 12 51 64 9 11 16 ...

Page 17: ...9 Technical Information Service Manual 3 2 Outdoor Unit Unit inch 35 13 13 32 27 9 16 15 19 32 38 14 21 64 22 18K 24K Unit inch 14 37 64 31 7 64 16 13 16 15 9 16 38 37 64 24 36 7 32 ...

Page 18: ...sion valve Strainer Accumlator Compressor Capillary Indoor unit Outdoor unit Accumlator COOLING Discharge Suction Heat exchanger evaporator Heat exchanger condenser Valve Valve Liquid pipe side Gas pipe side Compressor Strainer Capillary Electron expansion valve Connection pipe specification Liquid pipe 1 4 inch Gas pipe 1 2 for 18K except DCX18CSB21S and DHX18CSB21S Gas pipe 5 8 for DCX24CSB21S a...

Page 19: ...is model STEPPING CAP BLOCK TERMINAL G EVAPORATOR FAN MOTOR JUMP AP2 MAIN BOARD YEGN BK BN YEGN N S XT1 BU AC L COM OUT COM MANUAL CONNECTOR AP3 WIRED ZONE MOTOR T SENSOR DISP2 DISP1 RT1 θ AP1 ROOM TUBE TEMP SENSOR TEMP SENSOR DISPLAY BOARD RECEIVER AND θ RT2 DC MOTOR M1 SWING UD M2 ELECTRIC BOX G CONTROLLER WARNING G OUTDOOR UNIT WH BU BK RD BN GN YEGN L1 L2 CONNECTING CABLE Please don t touch an...

Page 20: ...minutes to prevent the risk of electric shock WH BU BK RD BN BK BN WH BU GN YEGN GN YEGN θ θ θ DHX18CSB21S HEATER VALVE 4YV 4 WAY VT VT 4WAY BOND HEAT B EH D R D R BOTTOM WH BU BK BN RD BN BK WH BU Please don t touch any electronic component or terminal when the machine is running stopping or has been powered off for less than 30 minutes to prevent the risk of electric shock WARNING 50K 15K 20K G ...

Page 21: ...NETIC TERMINAL BLOCK Please don t touch any terminal when the voltage of terminal P DC and N DC at AP1 is higher than 30V to prevent the risk of electrical shock CONNECTOR BK WH PRINTED CIRCUIT BOARD PE G YEGN 3 L 3 L COMP L3 RING MAGNETIC TEMP SENSOR OUTTUBE OUTROOM TEMP SENSOR TEMP SENSOR EXHAUST T_SENSOR RT2 RT3 YEGN AP1 W RD V YE U BU BU YE RD U V W G D R U B E Y G OFAN OVC_COMP WH WH SAT YEGN...

Page 22: ...e 6 Left and right swing interface only for the mode with this function 7 Display interface 8 Jumper cap 9 Terminal for communication with mainboard of outdoor unit 10 Terminal of wired controller 11 Fuse 12 Live wire 13 Interface of health function live wire only for the mode with this function 14 Interface of health function neutral wire only for the mode with this function 1 2 5 3 6 4 7 8 9 10 ...

Page 23: ...ction 5 Interface of temperature sensor 6 Overload interface of compressor 7 Electronic expansion valve 8 Interface of DC fan 9 Compressor electric heater interface 10 4 way valve interface 11 2 way valve interface 12 Chassis electric heater interface 13 Communication wire 14 Live wire 15 Grounding wire 16 Neutral wire Top view Bottom view 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Outdoor Unit ...

Page 24: ...face 2 Compressor overload protector 3 Temperature sensor 4 Electronic expansion valve 5 Outdoor fan 6 4 way valve 7 Communication interface with indoor unit 8 Live wire 9 Grounding wire 10 Neutral wire 11 Reactor interface 2 12 Reactor interface 1 13 2 way valve interface 1 2 3 4 13 5 6 7 8 9 11 10 12 ...

Page 25: ...Clock Heat mode Fan mode Dry mode Cool mode Auto mode Operation mode I feel Note After putting through the power the air conditioner will give out a sound Operation indictor is ON red indicator After that you can operate the air conditioner by using the remote controller Under On status pressing the button on the remote controller the signal icon on the display of remote controller will blink once...

Page 26: ...etting TIMER ON TIMER OFF or CLOCK press or button to adjust time Refer to CLOCK TIMER ON TIMER OFF buttons Caution Under AUTO speed air conditioner will select proper fan speed automatically according to factory setting Fan speed under dry mode is low speed Pressing this button can set fan speed sequentially as auto AUTO low medium high Press this button to select your required operation mode AUT...

Page 27: ...will stop blinking icon resumes displaying Cancel TIMER ON Under the condition that TIMER ON is started up press TIMER ON button to cancel it TIMER OFF button TIMER OFF button can set the time for timer off After pressing this button icon disappears and the word OFF on remote controller blinks Press or button to adjust TIMER OFF setting After each pressing or button TIMER OFF setting will increase...

Page 28: ...er energy saving function set temperature can t be adjusted Press TURBO button and the remote controller won t send signal Sleep function and energy saving function can t operate at the same time If energy saving function has been set under cooling mode pressing sleep button will cancel energy saving function If sleep function has been set under cooling mode starting up the energy saving function ...

Page 29: ...compensation is 0 Others are same as above 5 Fan mode Under this mode indoor fan operates at set fan speed There will be no outdoor unit function in fan mode This mode is only to circulate the ambient indoor air Indoor fan can operate at high medium low or auto fan speed 2 Other control 1 Buzzer Upon energization or availably operating the unit or remote controller the buzzer will give out a beep ...

Page 30: ...ant recovery mode the unit will stay in Refrigerant Recovery Function for 25 minutes After the 25 minutes have passed the unit will return to the last state of operation before Refrigerant Recovery Function was activated stand by cooling heating 11 Ambient temperature display control mode 1 When user sets the controller to display set temperature corresponding remote control code 01 current set te...

Page 31: ...ration 1 If the compressor is shut down and Tsetup Tindoor ambient temperature Tcooling indoor ambient temperature compensation 32 9ºF start up the machine for cooling and the cooling operation will start 2 During operations of cooling if 32ºF Tsetup Tindoor ambient temperature Tcooling indoor ambient temperature compensation 35 6ºF the cooling operation will be still running 3 During operations o...

Page 32: ...wer memory the machine can be restarted after remote shutdown and powering up again without delay 1 Cooling mode Start the machine to enter into cooling operation for cooling the compressor is switched on 2 Dehumidifying mode Same as the cooling mode 3 Air supplying mode The compressor is switched off 4 Heating mode 1 Start the machine to enter into heating operation for heating the compressor is ...

Page 33: ... should not be started and should be stopped to treat according to the overload protection Clear the trouble instances at the mode of power turn off heating and the protection times are not counted 2 Frequency limited If TCooling overload frequency limited temperature Touter pipe T Cooling overload frequency reducing temperature at normal speed you should limit the frequency raising of compressor ...

Page 34: ...temperature at normal speed during discharging you should limit the frequency raising of compressor 3 Reducing frequency at normal speed and stopping machine If Tfrequency reducing temperature at normal speed during discharging TDischarge Tfrequency reducing temperature at high speed during discharging you should adjust the compressor frequency by reducing 8Hz 90s till the lower limit After it run...

Page 35: ...uld adjust the compressor frequency by reducing 30Hz 90s till the lower limit After it was running 90s at the lower limit if T frequency reducing temperature at normal speed of module T Module you should stop the machine for module overheating protection 5 Power turn off If the TPower turn off temperature of module TModule you should stop the machine for module overheating protection If TModule TL...

Page 36: ...reversion abnormality And then it can run if stopping the reversion Valve abnormity protection for 4 way valve 3min If it still can t run when the reversion abnormality protection for 4 way valve happens to stop working for three times in succession it is available if pressing ON OFF Attention The protection should be shielded during the testing mode and defrosting process and it should clear out ...

Page 37: ...peration 3 When 32ºF Toutdoor amb 35 6ºF the electric heating of chassis will keep original status 7 Electric Heating Function of Compressor 1 When Toutdoor amb 23ºF compressor stops operation while the electric heating of compressor starts operation 2 When Toutdoor amb 28 4ºF the electric heating of compressor stops operation 3 When 23ºF Toutdoor amb 28 4ºF the electric heating of compressor will...

Page 38: ...ay 1 1 LCD Display of Wired Zone Controller 1 2 Description of LCD Display No Symbols Description 1 Swing function 2 Air exchange function this function is currently unavailable for this unit 3 Sleep function Only sleep 1 4 Each kind of running mode of indoor unit auto mode 5 Cooling mode 6 Dry mode 7 Fan mode 8 Heating mode 9 Defrosting function for the outdoor unit 10 Gate control function this ...

Page 39: ...unit range 16 30 C Timer setting range 0 5 24 hr 6 3 Fan Setting of the high middle low auto fan speed 4 Mode Setting of the Cooling Heating Fan Dry Auto mode of the indoor unit 6 Function Switchover among the functions of Turbo Save E heater Blow etc 7 Timer Timer setting 8 On Off Turn on off the indoor unit 4 2 Mode Press them for 5s under off state of the unit to enter cancel the Memory functio...

Page 40: ...1 C every 0 5s as shown in Fig 3 3 1 In the Cooling Dry Fan or Heating mode the temperature setting range is 16 30 C 61 86 F In the Auto mode the setting temperature is unadjustable 3 4 Fan Setting Under the On state of the unit press Fan and then fan speed of the indoor unit will change circularly as shown in Fig 3 4 1 3 5 Timer Setting Under on state of the unit Press Timer button to set timer o...

Page 41: ...fter setting of timer if Timer button is pressed LCD won t display xx Hour so that timer setting is canceled Timer off setting under the On state of the unit is shown here in Fig 3 5 1 Fig 3 5 1 Timer off Setting under the On State of the Unit Fig 3 5 2 Timer on Setting under the Off State of the Unit Timer on setting under the Off state of the unit is shown in Fig 3 5 2 Press Enter Cancel to conf...

Page 42: ...n state of the unit till the unit enters the Sleep setting state After that press Enter Cancel to confirm this setting Sleep off When the Sleep function is activated press Function to enter the Sleep setting status After that press Enter Cancel to cancel this function In the Cooling or Dry mode the temperature will increase by 1 C 1 2 F after the unit runs under Sleep1 for 1hr and 1 C 1 2 F after ...

Page 43: ...approach the setting value In the Cooling or Heating mode press Function till the unit enters the Turbo setting status and then press Enter Cancel to confirm the setting When the Turbo function is activated press Function to enter the Turbo setting status and then press Enter Cancel to cancel this function Turbo function setting is as shown below in Fig 3 8 1 ...

Page 44: ...ly evaporated to avoid mildew In the Cooling or Dry mode press Function till the unit enters the Blow setting status and then press Enter Cancel to active this function When the Blow function is activated press Function to the Blow setting status and then press Enter Cancel to cancel this function Blow function setting is as shown below ...

Page 45: ...ed If this function is not set the unit will be under the Off state after power failure and then power recovery Memory recovery If this function has been set for the wired controller the wired controller after power failure will resume its original running state upon power recovery Memory contents On Off Mode set temperature set fan speed and Lock function 4 Installation and Dismantlement 4 1 Conn...

Page 46: ...ir line into the slot of the wired zone controller and then buckle the front panel and the soleplate of the wired zone controller together 5 Finally fix the front panel and the soleplate of the wired zone controller tightly with screws ST2 9X6 CAUTION Please pay special attention to the followings during the connection to avoid the malfunction of the air conditioning unit due to electromagnetic in...

Page 47: ...uring the operation of the system the error code will be displayed on the LCD as show in Fig 5 1 If multiple errors occur at the same time their codes will be displayed sequentially Note In event of any error please turn off the unit and contact a certified technician ...

Page 48: ... UHGXFH WKH YROWDJH WR VDIHW YDOXH 7RXFKLQJ WKH HOHFWURO WLF FDSDFLWRU ZLWKLQ PLQ DIWHU FXWWLQJ WKH SRZHU ZLOO FDXVH HOHFWULF VKRFN I PDLQWHQDQFH LV QHHGHG IROORZ WKH VWHSV EHORZ WR GLVFKDUJH HOHFWULFLW RI HOHFWURO W LF FDpacitor after power off 2SHQ WKH WRS FRYHU RI RXWGRRU XQLW DQG WKHQ UHPRYH WKH FRYHU RI HOHFWULF ER A B A B discharge resistance or plug of soldering iron RXWGRRU PDLQERDUG FRYHU...

Page 49: ...8 Off 3s and blink 17 times The complete unit stops 1 Power supply is abnormal 2 Detection circuit of indoor control mainboard is abnormal 13 condenser cooling dehumidifying except the indoor fan motor is running others will stop to run heating all stop running ...

Page 50: ... and Off 05s Defrosting will occur in heating mode Compressor will operate while indoor fan will stop Complete unit current detection malfunction Off 3s and blink 13 times U5 Overload normal Overload normal Overload normal Cooling dehumidifying compressor not running fan ...

Page 51: ...43 ...

Page 52: ...or poorly contacted Insert the temperature sensor tightly yes Is malfunction eliminated Is there short circuit due to trip over of the parts Make the parts upright yes Is malfunction eliminated Replace the mainboard with the same model End no no Is the temperature sensor normal according to the Resistance Table no Replace it with a temperature sensor with the same model no yes yes Is malfunction r...

Page 53: ...sert the wiring terminal of indoor fan It s the malfunction of main board Replace a new main board that is of the same model It s the malfunction of main board Replace a new main board that is of the same model Replace a new main board that is of the same model It s the malfunction of main board Then check whether the voltage between terminal 2 and terminal 3 of the motor interface is 15VDC Connec...

Page 54: ...46 3 Malfunction of Protection of Jumper Cap C5 ...

Page 55: ...isplay board Main board of IDU matches with that of ODU Communication cord is damaged Replace IDU s main board Malfunction eliminated End Connect the line according to wiring diagram Match correctly according to product specification Replace communication cord Replace ODU s main board Malfunction eliminated Malfunction eliminated Malfunction eliminated yes yes yes yes yes yes yes no no no no no no...

Page 56: ... capacitor of power DC 180V 380V Test 5 Two ends of diode D15 30 PRGXODU 9 SRZHU VXSSO DC 14 5V 15 6V Test 6 Two ends of electrolytic capacitor C715 9 SRZHU VXSSO DC 12V 13V Test 7 Two ends of electrolytic capacitor C710 9 SRZHU VXSSO DC 5V Test 8 Two ends of electrolytic capacitor C226 9 SRZHU VXSSO DC 3 3V Test 9 7ZR HQGV RI FKLS FDSDFLWRU C912 9 SRZHU VXSSO DC 15V 18V Test 10 Between M to GND 3...

Page 57: ...circuit on control panel AP1 Replace the control panel AP1 Measure the AC voltage between terminalL andN on wiring board XT power supply Voltage within 210VAC 250VAC Shut down the power and repair the power supply to restore the range 210VAC 250VAC power on and restart the unit If the fault is eliminated Shut down the power and wait 20 mi nutes or use DC voltmeter to measure the voltage on the two...

Page 58: ...SUHVVRU 203 LV ZHOO FRQQHFWHG I WKH DUH ORRVHQHG I WKH FRQQHFWLRQ VHTXHQFH LV FRUUHFW Ɣ V YROWDJH LQSXW LQ WKH QRUPDO UDQJH 7HVW WKH YROWDJH EHWZHHQ 1 RI ZLULQJ ERDUG 7 E YROWDJH PHWHU Ɣ I FRLO UHVLVWDQFH RI FRPSUHVVRU LV QRUPDO V FRPSUHVVRU FRLO LQVXODWLQJ WR FRSSHU SLSH ZHOO Ɣ I WKH ZRUN ORDG RI XQLW LV KHDY I UDGLDWLQJ RI XQLW LV ZHOO Ɣ I WKH UHIULJHUDQW FKDUJLQJ LV DSSURSULDWH 0DOIXQFWLRQ GLDJ...

Page 59: ...he two ends of capacitor C2 until the voltage is lower than 20V Replace the capacitor C2 Then energize and start the unit Replace the control panel AP1 Take corrective actions according to Technical Service Manual and then energize and start the unit If there is any abnormality described above Replace the control panel AP1 If the connection between AP1 and COMP is unsecure or the connection order ...

Page 60: ...inal OFAN is connected well 2 Test if resistance value of any two terminals is less than 1k with ohmic meter If the indoor and outdoor fan work well After the unit de energized for 20min Replace control board AP1 If the radiating of outdoor and indoor unit is well Improve the radiating environment of unit Replace outdoor fan Y Replace fan capacitor C1 Anti high temperature overload protection Norm...

Page 61: ... connected and connection sequence is correct Replace control board AP1 Replace the compressor If malfunction is removed If the stop time of compressor is more than 3min N If the stop time is not enough and the high and low pressure of system is not balance please start it after 3min Improve the connection situation of control board AP1 and compressor COMP connect it with wiring diagram N Y N If t...

Page 62: ...stop time of compressor is more than 3min Synchronism after energize the unit and start it Connect wire well Synchronism occurred during operation Replace control board AP1 If the radiating of unit is well Remove malfunction Improve the radiating of unit clean heat exchanger and increase ventilation Replace fan capacitor C1 Replace outdoor fan Y N N N Y Y N Replace control board AP1 Remove malfunc...

Page 63: ...agram Replace EKV coil of electron expansion valve If the wiring terminal FA of electron expansion is well connected Remove malfunction The resistance value of first an d th e fifth lead is similar less than 100 After the unit de energized for 20min Remove malfunction Y N N N If the overload protector SAT is well connected N Under ambient temperature test the resistance of overload protector with ...

Page 64: ...ation circuit of outdoor unit Problem of communication circuit Check built in wiring of indoor and outdoor unit Connection correct Malfunction of circuit is detected with control board AP1 voltage Check connection wire of indoor and outdoor unit with circuit diagram Check connection wire of indoor and outdoor unit with circuit diagram If the unit is operation normal before malfunction Y N Y N If t...

Page 65: ...door unit malfunction Test voltage value with Test 13 position in diagram with voltage meter Number jumping Test voltage value with Test 11 position in diagram with voltage meter Number jumping Test voltage value with Test 12 position in diagram with voltage meter Y Y Y Y Number jumping The circuit of outdoor unit communication is normal Y N N N N End ...

Page 66: ...ails 0DOIXQFWLRQ RI FRPSUHVVRU Compressor can t operate 5HIHU WR SRLQW RI PDLQWHQDQFH PHWKRG IRU details 8 4 Troubleshooting for Normal Malfunction 1 Air conditioner doesn t start 2 Poor cooling heating for air conditioning unit 3 Horizontal louver doesn t swing 3RVVLEOH DXVHV LVFULPLQDWLQJ 0HWKRG LU FRQGLWLRQHU 6WDWXV 7URXEOHVKRRWLQJ 1R SRZHU VXSSO RU SRRU FRQQHFWLRQ IRU SRZHU SOXJ IWHU HQHUJL DW...

Page 67: ...densate pipe UDSSLQJ LV QRW WLJKW DWHU OHDNLQJ IURP WKH SLSH FRQQHFWLRQ SODFH RI LQGRRU XQLW UDS LW DJDLQ DQG EXQGOH LW WLJKWO 5 Compressor doesn t operate 3RVVLEOH FDXVHV LVFULPLQDWLQJ PHWKRG DLU FRQGLWLRQHU VWDWXV 7URXEOHVKRRWLQJ Wrong wire connection or poor connection KHFN WKH ZLULQJ VWDWXV DFFRUGLQJ WR FLUFXLW diagram Connect wires according to wiring diagram to PDNH VXUH DOO ZLULQJ WHUPLQDOV...

Page 68: ...efore removal 1 Remove filter assy Open the front panel Push the left and right filters to make them break away from the groove on the front case Then remove the left and right filters one by one Left filter Groove Right filter Front case Front panel Screw off the two screws that are locking the display board Separate the display board from the front panel Take A1 panel for example by remove the f...

Page 69: ...Manual Loosen the connection clasps between front case sub assy and bottom case Lift up the front case sub assy and take Remove the screws that are locking the swing motor and take the motor off it out Swing motor ...

Page 70: ...ng screw Remove the wiring terminals of motor and stepping motor Remove the electric box assy Remove the screws that are locking each lead wire S crew Wire clip Power cord Rotate the electric box assy Twist off the screws that are locking the wire clip and loosen the power cord Remove the wiring terminal of power cord Lift up the main board and take it off Instructions Some wiring terminals of thi...

Page 71: ...63 Service Manual R ear case assy First remove the left side of evaporator from the groove on the rear case assy Then remove the right side from the clasp on the rear case assy Groove Clasp ...

Page 72: ...64 Service Manual ...

Page 73: ...ate and then remove the valve cover 2 Remove grille and outer case grille Remove the four screws connecting the grille and outer case and then remove the panel grille Remove the screws connecting the top cover with outer case right side plate and left side plate lift the top cover upwards to remove it Steps Procedure b a Warning Be sure to wait for a minimum of 20 minutes after turning off all pow...

Page 74: ...ft side plate and then remove the outer case Remove the screws connecting the right side plate with electric box assy valve support chassis and condenser side plate and then remove the right side plate Remove the screws connecting the left side plate with the chassis and then remove the left side plate Steps Procedure left side plate outer case 3 Remove right and left side plate right side plate a...

Page 75: ...s connecting the motor support and chassis and then loosen the stopper to remove the motor support Remove the screws fixing the electric box sub assy loosen the wire bundle pull out the wiring terminals and then pull the electric box upwards to remove it Steps Procedure 5 Remove electric box 4 Remove axial flow blade axial flow fan motor support fan motor electric box a b ...

Page 76: ...the isolation plate Unsolder the welding joints connecting the 4 way valve assy with capillary sub assy compressor and condenser remove the 4 way valve Note Before unsoldering the welding joint wrap the 4 way valve with a wet cloth completely to avoid damage to the valve caused by high temperature Steps Procedure 8 Remove 4 way valve assy 7 Remove isolation plate 6 Remove the insulation insulation...

Page 77: ...pipe and suction pipe from foreign objects Remove the screws connecting the support condenser and condenser assy and then remove the support condenser Remove the two screws securing the condenser and chassis and then lift the condenser upwards to remove it Steps Procedure 10 Remove condenser sub assy 9 Remove compressor compressor support condenser chassis subassy sub assy a b ...

Page 78: ...nt side panel Loosen the screws connecting the front side panel and chassis Remove the front side panel Procedure valve cover Remove the screw connecting the big handle and right side plate and then remove the big handle Remove the screw connecting the valve cover and right side plate and then remove the valve cover 1 Remove big handle valve cover and top cover 24K NOTE This model doesn t have a 4...

Page 79: ...off the screws connecting the grille and panel and then remove the grille 5 Remove right side plate right side plate Twist off the screws connecting the right side plate and chassis valve support and condenser and then remove the right side plate 6 Remove axial flow blade axial flow blade Twist off the nuts on blade with a wrench and then remove the axial flow blade Procedure a b ...

Page 80: ...r pliers pull out the wiring terminal pull it upwards to remove the electric box electric box Twist off the screws on electric box with a screwdriver and then remove the electric box 8 Remove motor motor Twist off the tapping screws fixing the motor pull out the pin of leading wire for motor and then remove the motor Procedure a b ...

Page 81: ...ort Twist off the screws connecting isolation sheet and end plate of condenser and chassis and then remove the isolation sheet 11 Remove 4 way valve 10 Remove isolation sheet isolation sheet 4 way valve Unsolder the pipeline between compressor condenser gas and liquid valve and then remove the 4 way valve Note Release all refrigerant before unsoldering Procedure ...

Page 82: ...the gas valve with wet cloth completely to avoid the damage to valve and release all refrigerant completely first Unsolder the soldering joint between liquid valve and connection pipe of liquid valve and then remove the liquid valve Twist off the screws connecting valve support and chassis and then remove the valve support 14 Remove compressor compressor 13 Remove valve support valve support Twist...

Page 83: ...e left side plate Twist off the screws connecting the left side plate and chassis with a screwdriver and then remove the left side plate Pull it upwards to separate the chassis and condenser 16 Remove chassis and condenser chassis condenser Procedure ...

Page 84: ...quid pipe inch Gas pipe inch Cooling only oz ft Cooling and heating oz ft Ф1 4 Ф3 8or Ф1 2 0 2 0 2 Ф1 4 or Ф3 8 Ф5 8 or Ф3 4 0 2 0 2 Ф1 2 Ф3 4 or Ф7 8 0 3 1 3 Ф5 8 Ф1 or Ф1 1 4 0 7 1 3 Ф3 4 2 7 2 7 Ф7 8 3 8 3 8 Cooling capacity Max length of connection pipe Max height difference 5000 Btu h 1465 W 49 21ft 16 40ft 7000 Btu h 2051 W 49 21ft 16 40ft 9000 Btu h 2637 W 49 21ft 32 81ft 12000 Btu h 3516 W...

Page 85: ...wing steps A Cut the pipe Confirm the pipe length according to the distance of indoor unit and outdoor unit Cut the required pipe with pipe cutter B Remove the burrs Remove the burrs with shaper and prevent the burrs from getting into the pipe C Put on suitable insulating pipe D Put on the union nut Remove the union nut on the indoor connection pipe and outdoor valve install the union nut on the p...

Page 86: ... 0 717 24 8 60 23 95 9 779 165 2 2 28 235 4 0 697 26 6 57 18 96 8 9 382 167 2 206 237 2 0 678 28 4 54 31 98 6 9 003 168 8 2 133 239 0 66 30 2 51 59 100 4 8 642 170 6 2 064 240 8 0 642 32 49 02 102 2 8 297 172 4 1 997 242 6 0 625 33 8 46 6 104 7 967 174 2 1 933 244 4 0 608 35 6 44 31 105 8 7 653 176 1 871 246 2 0 592 37 4 42 14 107 6 7 352 177 8 1 811 248 0 577 39 2 40 09 109 4 7 065 179 6 1 754 24...

Page 87: ...5 2 3 04 235 4 0 93 26 6 76 24 96 8 12 51 167 2 94 237 2 0 904 28 4 72 41 98 6 12 168 8 2 844 239 0 88 30 2 68 79 100 4 11 52 170 6 2 752 240 8 0 856 32 65 37 102 2 11 06 172 4 2 663 242 6 0 833 33 8 62 13 104 10 62 174 2 2 577 244 4 0 811 35 6 59 08 105 8 10 2 176 2 495 246 2 0 77 37 4 56 19 107 6 9 803 177 8 2 415 248 0 769 39 2 53 46 109 4 9 42 179 6 2 339 249 8 0 746 41 50 87 111 2 9 054 181 4...

Page 88: ...19 147 2 10 54 217 4 3 04 8 6 323 9 78 8 47 08 149 10 18 219 2 2 955 10 4 306 2 80 6 45 07 150 8 9 827 221 2 872 12 2 289 6 82 4 43 16 152 6 9 489 222 8 2 792 14 274 84 2 41 34 154 4 9 165 224 6 2 715 15 8 259 3 86 39 61 156 2 8 854 226 4 2 64 17 6 245 6 87 8 37 96 158 8 555 228 2 2 568 19 4 232 6 89 6 36 38 159 8 8 268 230 2 498 21 2 220 5 91 4 34 88 161 6 7 991 231 8 2 431 23 209 93 2 33 45 163 ...

Page 89: ...81 ...

Page 90: ...Product improvement specifications and appearance in this manual are subject to change without prior notice Johnson Controls Inc USA LIT 12012193 ...

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Johnson Controls DCX18CSB21S, Service Manual

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