Gree Y Series Service Manual

Inverter-driven air conditioning units

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Service

Manual

"Y" SERIES

INVERTER-DRIVEN AIR

CONDITIONING UNITS

Type

INDOOR UNITS

Type

OUTDOOR UNITS

Type

CONTROLLER

PLEASE READ AND

UNDERSTAND THIS

MANUAL BEFORE USING

THIS INVERTER-DRIVEN

AIR CONDITIONING UNIT.

KEEP THIS MANUAL FOR

FUTURE REFERENCE.

Model

DHY09NWB21S

DHY12NWB21S

DHY18NWB21S

DHY24NWB21S

Model

DHY09CSB21S

DHY12CSB21S

DHY18CSB21S

DHY24CSB21S

Model

DRCY

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Summary of Contents for Gree Y Series

Page 1 Service Manual "Y" SERIES INVERTER-DRIVEN AIR CONDITIONING UNITS Type Model DHY09NWB21S DHY12NWB21S INDOOR UNITS DHY18NWB21S DHY24NWB21S Type Model DHY09CSB21S DHY12CSB21S OUTDOOR UNITS DHY18CSB21S DHY24CSB21S Model Type DRCY CONTROLLER PLEASE READ AND UNDERSTAND THIS MANUAL BEFORE USING THIS INVERTER-DRIVEN AIR CONDITIONING UNIT. KEEP THIS MANUAL FOR FUTURE REFERENCE.
Page 2: Important Notice
Important Notice ● Johnson Controls, Inc. pursues a policy of continuing improvement in design and performance in its products. As such, Johnson Controls, Inc. reserves the right to make changes at any time without prior notice. ● Johnson Controls, Inc. cannot anticipate every possible circumstance that might involve a potential hazard. ●...
Page 3: Table Of Contents
Service Manual Table of Contents Safety Summary ......................i 1. Features ........................1 2. Specifications ......................2 2.1 Specification Sheet ......................2 2.2 Operation Characteristic Curve ..................8 2.3 Capacity Variation Ratio According to Temperature ............9 2.4 Noise Curve ........................10 2.5 Cooling and Heating Data Sheet in Rated Frequency ............11 3.
Page 4: Important Safety Instructions
1. Introduction This manual concentrates on inverter-driven cooling or heat pump air conditioning units. Read this manual carefully before installation. This manual should be considered as a permanent part of the air conditioning equipment and should remain with the air conditioning equipment. 2.
Page 5: Installation Precautions
Take the following precautions to reduce the risk of property damage. ● Be careful that moisture, dust, or variant refrigerant compounds not enter the refrigerant cycle during installation work. Foreign matter could damage internal components or cause blockages. ● If air filters are required on this unit, do not operate the unit without the air filter set in place. If the air filter is not installed, dust may accumulate and breakdown may result.
Page 6: Refrigerant Precautions
● Do not position the condensate pipe for the indoor unit near any sanitary sewers where corrosive gases may be present. If you do, toxic gases can seep into breathable air spaces and can cause respiratory injuries. If the condensate pipe is installed incorrectly, water leakage and damage to the ceiling, floor, furniture, or other possessions may result.
Page 7: Electrical Precautions
under pressure and never open pressurized system parts. ● Before installation is complete, make sure that the refrigerant leak test has been performed. If refrigerant gases escape into the air, turn OFF the main switch, extinguish any open flames and contact your service contractor.
Page 8 ● Communication cabling shall be a minimum of 18-Gauge, 2-Conductor, Stranded Copper. Shielded cable must be considered for applications and routing in areas of high EMI and other sources of potentially excessive electrical noise to reduce the potential for communication errors. When shielded cabling is applied, proper bonding and termination of the cable shield is required as per Johnson Controls guidelines.
Page 9: Features
Service Manual 1. Features Summary of Features Indoor Unit: DHY09NWB21S DHY12NWB21S DHY18NWB21S DHY24NWB21S Outdoor Unit: DHY09CSB21S DHY12CSB21S DHY24CSB21S DHY18CSB21S DHY24CSB21S DRCY Technical Information...
Page 10: Specifications
Service Manual 2. Specifications 2.1 Specification Sheet DHY09NWB21S Model DHY09CSB21S Rated Voltage 208/230 Power Supply Rated Frequency Phases Power Supply Mode Outdoor Cooling Capacity(Min~Max) Btu/h 9000(3500~9600) Heating Capacity(Min~Max) Btu/h 9800(2200~11000) Cooling Power Input(Min~Max) 600(330~1200) Heating Power Input(Min~Max) 650(100~1250) Cooling Power Current Heating Power Current Rated Input 1300...
Page 11 Service Manual DHY09CSB21S Model of Outdoor Unit MITSUBISHI ELECTRIC Compressor Manufacturer/ (GUANGZHOU) COMPRESSOR Trademark CO.LTD Compressor Model KNB092FTAMC FV50S (PVE) Compressor Oil Compressor Type Rotary Compressor RLA Compressor Power Input Overload Protector 1NT11L-6578 Metering Device Electronic expansion valve Operation temp ºF 60.8~86 Ambient temp (cooling)
Page 12 Service Manual DHY12NWB21S Model DHY12CSB21S Rated Voltage 208/230 Power Supply Rated Frequency Phases Power Supply Mode Outdoor Cooling Capacity(Min~Max) Btu/h 12000(3100~13000) Heating Capacity(Min~Max) Btu/h 13000(2400~14000) Cooling Power Input(Min~Max) 882(380~1300) Heating Power Input(Min~Max) 960(100~1350) Cooling Power Current Heating Power Current Rated Input 1400 Rated Current Air Flow Volume(SH/H/MH/M/ML/L/SL)
Page 13 Service Manual DHY12CSB21S Model of Outdoor Unit MITSUBISHI ELECTRIC Compressor Manufacturer/ (GUANGZHOU) COMPRESSOR Trademark CO.LTD Compressor Model KNB092FTAMC FV50S (PVE) Compressor Oil Compressor Type Rotary Compressor RLA Compressor Power Input Overload Protector 1NT11L-6578 Metering Method Electronic expansion valve Operation temp ºF 60.8~86 Ambient temp (cooling)
Page 14 Service Manual DHY18NWB21S DHY24NWB21S Model DHY18CSB21S DHY24CSB21S Rated Voltage 208/230 208/230 Power Supply Rated Frequency Phases Power Supply Mode Outdoor Outdoor Cooling Capacity(Min~Max) Btu/h 17999(4606~22178) 24000(6800~29300) Heating Capacity(Min~Max) Btu/h 19000(3412~24907) 25000(7500~34000) Cooling Power Input(Min~Max) 1500(180~2450) 2000(450~3050) Heating Power Input(Min~Max) 1580(232~2500) 2090(450~3300) Cooling Power Current 7.36...
Page 15 Service Manual DHY18CSB21S DHY24CSB21S Model of Outdoor Unit MITSUBISHI ELECTRIC ZHUHAI LANDA COMPRESSOR Compressor Manufacturer/ Trademark (GUANGZHOU)COMP CO,LTD/Gree Compressor Model SNB130FGYMC-L1 QXAS-D23zX090 FV50S (PVE) FV50S (PVE) Compressor Oil Compressor Type Rotary Rotary Compressor RLA 12.0 Compressor Power Input 1245 2450...
Page 16: Operation Characteristic Curve
Service Manual 2.2 Operation Characteristic Curve 09K 12K Cooling Heating Condition Condition Indoor:DB 70°F Indoor:DB 80.6°F WB66.2°F Indoor air flow: Super High Indoor air flow: Super High Pipe length:24.6ft Pipe length:24.6ft Compressor Frequency(Hz) Compressor Frequency(Hz) Cooling Heating Condition Condition Indoor:DB 70°F Indoor:DB 80.6°F WB66.2°F Indoor air flow: Super High Indoor air flow: Super High...
Page 17: Capacity Variation Ratio According To Temperature
Service Manual Cooling Heating Condition Condition Indoor:DB 70°F Indoor:DB 80.6°F WB66.2°F Indoor air flow: Super High Indoor air flow: Super High Pipe length:24.6ft Pipe length:24.6ft Compressor Frequency(Hz) Compressor Frequency(Hz) 2.3 Capacity Variation Ratio According to Temperature 09/12K Cooling Heating Conditions Conditions Indoor:DB80°F/WB66.9°F Indoor:DB70°F...
Page 18: Noise Curve
Service Manual 2.4 Noise Curve Cooling Heating Indoor side noise when blowing Outdoor side noise Outdoor side noise Right Right side side Front Front Middle High Indoor fan motor rotating speed Compressor frequency/Hz Compressor frequency/Hz Cooling Heating Indoor side noise when blowing Outdoor side noise Outdoor side noise Right...
Page 19: Cooling And Heating Data Sheet In Rated Frequency
Service Manual 2.5. Cooling and Heating Data Sheet in Rated Frequency Cooling: Rated cooling Pressure of gas pipe Inlet and outlet pipe Compressor condition( connecting indoor and temperature of heat Fan speed of Fan speed of Model frequency (DB/WB) outdoor unit exchanger indoor unit outdoor unit...
Page 20: Outline Dimension Diagram
Service Manual 3. Outline Dimension Diagram 3.1 Indoor Unit 6 3/8 21 2/7 6 3/7 09/12K Φ2 1/6 Φ2 1/6 1 3/8 6 2/7 3 1/7 5 2/3 7 4/9 Φ2 3/4 Φ2 3/4 2 1/6 2 1/6 4 2/3 1 3/4 29 2/5 Φ2 3/4...
Page 21: Outdoor Unit
Service Manual 3.2 Outdoor Unit 09/12K 31 8/9 35 2/5 15 1/2 13 2/5 15 3/5 Unit: inch Technical Information...
Page 22 Service Manual 14 4/7 38 4/7 16 4/5 Unit:inch Technical Information...
Page 23: Refrigerant System Diagram
Service Manual 4. Refrigerant System Diagram Outdoor unit Indoor unit Gas pipe side Valve 4-Way valve Di s charge Heat Accumlator Suction exchanger Compressor (evaporator) Heat exchanger Liquid pipe (condenser) side Valve Strainer Electronic Strainer expansion valve COOLING HEATING 09/12/24K Outdoor unit Indoor unit Gas pipe...
Page 24: Electrical Parts
Service Manual 5. Electrical Parts 5.1 Wiring Diagram ● Instruction Symbol Symbol Color Symbol Symbol Color Symbol Name White Green Jumper cap Yellow Brown COMP Compressor Blue Grounding wire YEGN Yellow/Green Black Violet Orange Note: Jumper cap is used to determine fan speed and the swing angle of horizontal lover for this model. ●...
Page 25 Service Manual ● Outdoor Unit 09/12K COMP TUBE OUTROOM EXHAUST COMP TEM.SENSOR TEM.SENSOR TEM.SENSOR YEGN YEGN COMP-U COMP-V COMP-W INDOOR UNIT OVC-COMP N(1) N(1) COMU AC-L1 OFAN1 YEGN HEAT-L TERMINAL HEAT-N1 AC-L2 LX-2 HEAT-N2 LX-1 BLOCK POWER HEATER HEATER (COMP) (CHASSIS) FAN MOTOR WARNING...
Page 26 Service Manual WARNING Please don't touch any terminal when the COMP. voltage of terminal P(DC+) and N(DC-) at YEGN AP1 is higher than 30V to prevent the risk COMP U(R) of electrical shock! OUTTUBE DISCHARGE OUTROOM V(S) W(C) MAGNETIC 4-WAY TEMP.
Page 27: Pcb Printed Diagram
Service Manual 5.2 PCB Printed Diagram Indoor Unit ● Top view 1 Neutral wire 2 DC fan 3 Auto button 4 Small up and down swing 5 Left and right swing 6 Big up&down swing 7 Interface of wired zone controller 8 Display interface 9 Ambient temperature sensor 10 Tube temperature sensor...
Page 28: Bottom View
Service Manual Outdoor Unit 09/12K ● Top view Input of neutral Interface 1 of Neutral wire of electric Live wire of 4-way 13 Temp sensor wire of power electric reactor heater of chassis valve Input of live Interface 2 of Neutral wire of electric Live wire of electric U,V,W three phases...
Page 29 Service Manual ● Top view Compressor overload Compressor interface Temperature sensor Electronic expansion valve protector Communication interface Fan HALL interface Outdoor fan 4-way valve with indoor unit Live wire Grounding wire Neutral wire Reactor interface 1 PFC capacitor interface 1 Reactor interface 2 ●...
Page 30 Service Manual ● Top view Name Name Name Name Compressor connection Electric reactor EEV terminal Live wire wire connecting wire1 Compressor overload PFC capacitor 10 Ground wire Outdoor fan interface interface connecting wire Temp. sensor terminal Four-way valve interface 11 Neutral wire Outdoor tube temp.
Page 31: Function And Control
Service Manual 6. Function and Control 6.1 Remote Controller Introduction Buttons on Remote Controller ON/OFF button FAN button ON/OFF button MODE button FAN button +/- button MODE button TURBO button +/- button button TURBO button button button CLOCK button button TIMER ON/ TIMER OFF button CLOCK button...
Page 32 ATUO Service Manual 2. FAN button Low fan Medium-low fan Medium fan Medium-high fan High fan Press this button, Auto, Low, Medium-low, Medium, Medium-high, High speed can be sequentially selected. After initial power is applied, Auto fan speed is default. Under DRY mode, Low fan speed only can be set up. ATUO Note: It’s Low fan speed under Dry mode.
Page 33 Service Manual 10. TEMP button Press this button, you can see indoor set temperature, indoor ambient temperature or outdoor ambient temperature on indoor unit’s display. The setting on the controller is selected sequentially as below: no display When selecting " "...
Page 34 Service Manual ●Sleep 3- the sleep curve setting under Sleep mode is user defined: (1) Under Sleep 3 mode, press "Turbo" button for a long time, remote control enters into user individuation sleep setting status, at this time, the time of remote control will display "1hour ", the setting temperature "88" will display the corresponding temperature of last setting sleep curve and blink.
Page 35: Replacement Of Batteries In Remote Controller
Service Manual Operation Guide 1. General operation (1)After initial power is applied, press ON/OFF button, the unit will start to run. (Note: When it is powered on, the guide louver of main unit will close automatically.) (2)Press MODE button, select desired running mode. (3)Pressing + or - button, to set the desired temperature (It is unnecessary to set the temp.
Page 36: Brief Description Of Modes And Functions
Service Manual 6.2 Brief Description of Modes and Functions ● Indoor Unit 1.Temperature Parameters Indoor preset temperature (Tpreset) Indoor ambient temperature (Tamb.) 2.Basic functions (The temperature in this manual is expressed by Centigrade. If Fahrenheit is used, the switchover between them Tf=TcX1.8+32.) Once the compressor is energized, there should be a minimum interval of 3 minutes between two start-ups.
Page 37 Service Manual Start heating Tpreset +5˚C(9ºF~10ºF) Previous running status Tpreset +2˚C(3ºF~4ºF) Tamb. Start heating 6 min. 3 min. 6 min. Compressor Blow residual Outdoor unit Blow residual heat heat Indoor unit 2 min. 2 min. 4-way valve Stop ② Defrosting and Oil Return When receiving the signal of defrosting and oil return, the horizontal louver(big one) will rotate to the position where the angle is minimum and the other horizontal louver(small one) will close.
Page 38 Service Manual ② Set temperature is 46ºF (8°C) and it is displayed on the indoor display panel. ③ In this mode, TURBO can’t be set and fan speed can’t be adjusted. ④ In this mode, when compressor operates, fan speed will be adjusted as follows; when compressor stops operation, indoor unit will operate at blowing residual heat.
Page 39 Service Manual (3)Buzzer Upon energization or availably operating the unit or remote controller, the buzzer will give out a beep. (4)Sleep Function In SLEEP mode, the unit will automatically select appropriate sleep curve to operate according to different temperature setting. (5)Turbo Function This function can be set in cooling or heating mode to quickly cool or heat the room.
Page 40 High Med. Mute Fan speed Service Manual D1 are equiangular). Upon turning off the unit, the horizontal louver will close at position O. Swing function is available only when swing function is set and indoor fan is operating. Note: a. If the position is set between O and D1, A 1and C1 or B1 and D1 by remote controller, the horizontal louver will swing between O and D1.
Page 41 Service Manual will keep original. When operating the remote controller during room temperature display, the set temperature will be displayed for 5 seconds first and then room temperature display returns. If there is malfunction, corresponding malfunction code will be displayed. For example, if ambient temperature sensor has malfunction, “F1”...
Page 42 Service Manual ● Outdoor Unit 1. Compensation function of input parameters According to the structure of wall-mounting unit, considering the comfortability for operation, indoor ambient temperature when the compressor is at OFF status is higher than set temperature under heating mode. 2.
Page 43 Service Manual 11.2 Under cooling or drying mode, if T <6, the operation frequency of compressor may increase or decrease; inner tube 11.2.1 If the unit is stopped because of freeze protection for 6 times successively, it can’t resume operation automatically and the malfunction will be displayed continuously, which can only be resumed by pressing ON/OFF button.
Page 44: Troubleshooting
7. Troubleshooting 7.1 Precautions before Performing Inspection or Repairs Be cautious during installation and maintenance. Follow safety regulations at all times to avoid electric shock and casualty or even death due to drop from high attitude. * Static maintenance is is performed while the unit is d-energized. For static maintenance, make sure that the unit is de-energized and the plug is disconnected.
Page 45: Confirmation
7.2 Confirmation (1)Confirmation of Power Supply Confirm that the power breaker operates(ON) normally; (2)Confirmation of Power Voltage Confirm that power voltage is AC 208-230 ±10%. If power voltage is not in this range, the unit may not operate normally.
Page 46: Flashing Led Of Indoor/Outdoor Unit And Primary Judgment
7.3 Flashing LED of Indoor/Outdoor Unit and Primary Judgment (1)Models:09/12K: Malfunction and Status Display Table Malfunction of Display of Malfunction of Indoor Unit Outdoor Unit Status of LED Status of LED Lamp Lamp Malfunction Display Malfunction Name Type LED Lamp LED Lamp Yellow Nixie...
Page 47 Wrong connection of communication wire or malfunction of expansion valve (free match) Malfunction of current detection for the Blinks for complete unit 13 imes Wrong connection of communication wire or status of detecting malfunction of expansion valve (free match) Blinks Mode conflict for 7 times...
Page 48 If malfunction occurs,corresponding code will display and the unit will resume normal until protection or malfunction disappears. Yellow indicator blinks for once Compressor stars (normal) Defrosting (normal display of indoor unit) Yellow indicator blinks for twice Anti-freezing protection (normal Yellow indicator blinks for 3 times display of indoor unit) IPM protection Yellow indicator blinks for 4 times...
Page 49 Analysis or processing of some of the malfunction display: 1. Compressor discharge protection operation; malfunction of compressor; malfunction of protection relay; malfunction of discharge sensor; outdoor temperature too high. Processing method: refer to the malfunction analysis in the above section. 2.
Page 50 Display Method of (2)Models:18/24K: Outdoor Unit (Indicator has 3 kinds Display Method of Indoor Unit of display status and they will be displayed Malfunction A/C status Possible Causes circularly every 5s.) Name Indicator Display (during Dual-8 blinking, ON 0.5s and OFF 0.5s) ■Illuminated Blink Code...
Page 51 Display Method of Outdoor Unit (Indicator has 3 kinds Display Method of Indoor Unit of display status and they will be displayed Malfunction A/C status Possible Causes circularly every 5s.) Name Indicator Display (during Dual-8 blinking, ON 0.5s and OFF 0.5s) ■Illuminated Blink Code...
Page 52 Display Method of Outdoor Unit (Indicator has 3 kinds Display Method of Indoor Unit of display status and they will be displayed Malfunction A/C status Possible Causes circularly every 5s.) Name Indicator Display (during Dual-8 blinking, ON 0.5s and OFF 0.5s) ■Illuminated Blink Code...
Page 53 Display Method of Outdoor Unit (Indicator has 3 kinds Display Method of Indoor Unit of display status and they will be displayed Malfunction A/C status Possible Causes circularly every 5s.) Name Indicator Display (during blinking, Dual-8 ON 0.5s and OFF 0.5s) ■Illuminated Blink Code...
Page 54: Checking The Main Parts
7.4 Checking the Main Parts Indoor unit: (1)Temperature sensor malfunction Start Is the wiring terminal between temperature sensor and the controller loosened or poor ly contacted? Insert the temperature sensor tightly M alfunction is eliminated. Is there short circuit due to tri-pover of the pa rts? Make the parts upright Malfunction is...
Page 55 (2)Indoor fan does not operate (H6) Start Pull the blade by hand under de-energization status Adjust the motor and Whether the blade assembly to let blade can operate the motor can operate smoothly smoothly Is malfunction eliminated Check whether the Reinsert the wiring wiring terminal between terminal of indoor fan...
Page 56 (3)Jumper cap malfunction (C5) C5 is displayed on the unit. Install a matching Is there jumper cap on the jumper cap . controller? Is the malfunction eliminated? Re-insert the jumper Is the jumper cap inserted incorrectly or improperly? Is the malfunction eliminated? Replace the jumper...
Page 57 (4) Communication malfunction (E6) Poor contact of any line may lead to communication malfuntion. Is there incorrect match between the main board and the display panel or between the indoor and outdoor boards? Is there incorrect connection? Note: 1.Before replacing mainboard of indoor unit, make sure the correct replacement is on hand. The following tests should be done: a.Check if protective tube FUSE 1 has open circuit.
Page 58 Outdoor unit: (1) Capacity charging malfunction (outdoor unit malfunction) (AP1 below is control board of outdoor unit) Main detection point: Detect if the voltage of L and N terminal of wiring board is between 210AC-240AC by alternating voltage meter; Is reactor (L) well connected? Is connection wire loosened or pull-out? Is reactor (L) damaged Malfunction diagnosis process: Turn on the unit and wait 1 minute...
Page 59 (2) IPM protection, desynchronizing malfunction, phase current of compressor is overcurrent (AP1 below is control board of outdoor unit) Main detection point: If control board AP1 and compressor COMP is well connected? If they are loosened? If the connection sequence is correct? Is voltage input in the normal range (Test the voltage between L, N of wiring board XT by DC voltage meter)? If coil resistance of compressor is normal? Is compressor coil insulating to copper pipe well? If the work load of unit is heavy? If radiating of unit is well?
Page 60 Energize and switch on Use AC voltmeter If the voltage Check the supply to measure the IPM protection between terminal L voltage and voltage between occurs after the and N on wiring machine has run for terminal L and N restore it to board XT is within a period of time?
Page 61 (3) Diagnosis for anti-high temperature, overload protection (AP1 below is control board of outdoor unit) Main detection point: If the outdoor ambient temperature is in normal range; If the indoor and outdoor fan is running normal; If the radiating environment of indoor and outdoor unit is well. Malfunction diagnosis process: Anti-high temperature, overload protection...
Page 62 (4) Diagnosis for failure start up malfunction (AP1 below is control board of outdoor unit) Main detection point: If the compressor wiring is correct? If the stop time of compressor is enough? If the compressor is damaged? If the refrigerant charging is too much? Malfunction diagnosis process: Energize the unit and start it...
Page 63 (5) Diagnosis for compressor synchronism (AP1 below is control board of outdoor unit) Main detection point: If the system pressure is over-high? If the work voltage is over-low? Malfunction diagnosis process: Synchronism Synchronism after energize the unit occurred during and start it operation Check if the fan Replace fan...
Page 64 (6) Diagnosis for overload and discharge malfunction (AP1 below is control board of outdoor unit) Main detection point: If the electron expansion valve is connected well? Is the expansion valve damaged? If the refrigerant is leakage? If the overload protector is damaged? Malfunction diagnosis process: After the unit de-energized...
Page 65 (7) PFC (correction for power factor) malfunction (outdoor unit malfunction) (AP1 below is control board of outdoor unit) Main detection point: Check if reactor (L) of outdoor unit and PFC capacity are damaged. Malfunction diagnosis process: Start Check the connection wire of reactor (L) of outdoor unit and PFC capacity...
Page 66 (8) Communication malfunction (AP1 below is control board of outdoor unit) Main detection point: Check if the connection wire and the built-in wiring of indoor and outdoor unit is connected well and no damaged; If the communication circuit of indoor mainboard is damaged? If the communication circuit of outdoor mainboard (AP1) is damaged Malfunction diagnosis process: Start If the unit is operation...
Page 67: Troubleshooting For Normal Malfunction
7.5 Troubleshooting for Normal Malfunction 1. Air Conditioner can't Be Started Up Possible Causes Discriminating Method (Air conditioner Status) Troubleshooting Confirm whether it's due to power failure. If yes, No power supply, or poor After energization, operation indicator isn’t bright wait for power recovery.
Page 68 4. ODU Fan Motor can't Operate Possible causes Discriminating method (air conditioner status) Troubleshooting Connect wires according to wiring diagram to Wrong wire connection, or poor Check the wiring status according to circuit make sure all wiring terminals are connected connection diagram firmly...
Page 69: Removal Procedures
Service Manual 8. Removal Procedures Warning: Be sure to wait for a minimum of 20 minutes after turning off all power supplies and discharge the refrigerant 8.1 Removal Procedures for Indoor Unit completely before removal. (1)Models:09/12K Steps Procedure 1. Before disassembling the unit Before disassembling the unit.
Page 70 Service Manual Steps Procedure Remove the rotating shaft of big guide louver from the groove, slightly bend the big guide louver to remove it. big guide louver Remove the axial bushing of small guide louver. axial bushing Remove the rotating shaft of small guide louver from the groove;...
Page 71 Service Manual Steps Procedure panel to remove the display. 5.Remove front case Remove the screws securing electric box cover 2 to remove the electric box cover 2. electric box cover 2 screw screw clamp Remove the screws fixing front panel; loosen the clamps to remove the front panel.
Page 72 Service Manual Steps Procedure 6.Remove swing fan blade Loosen the clamps fixing swing connecting rod, to remove the swing connecting rod. clamp swing connecting rod clamp remove the swing fan blade. swing fan blade 7.Remove electric box sub-assy heat exchanger thermistor Remove the indoor tube temp.
Page 73 Service Manual Steps Procedure Remove the clamps fixing electric box cover to remove the cover. electric box cover electric box cover sub-assy screw Remove each wiring terminal, and remove the electric box cover sub-assy. 8.Remove evaporator sub-assy auxiliary piping pipe clamp Remove the screws fixing connection pipe clamp, to remove the connection pipe clamp.
Page 74 Service Manual Steps Procedure auxiliary piping Remove the screws holding the coil in place, then gently bend tube assembly and remove coil. evaporator sub-assy 9.Remove cross fan blade and motor Remove the screws attaching up/down louver stepper motor. up and down swing motor Remove the screws attaching the left/right stepper motor.
Page 75 Service Manual Steps Procedure Remove the screws holding the blower motor clamp. screw motor clamp Remove the cross fan blade and motor. bearing rubber grommet base Remove rubber grommet from bearing assembly. blower wheel assembly motor Loosen the set screw on the motor shaft then remove the blower wheel assembly.
Page 76 Service Manual Steps Procedure 1. Before disassembling the unit Before disassembling the unit. 2. Remove filter Open the panel. Loosen the clasps on filter, push the filter inward and then pull it upward. Then the filter can be removed. 3.Remove main louver Remove the center bushing of main louver.
Page 77 Service Manual Steps Procedure Remove the shaft of the main louver and while slightly bending the louver, remove it. big main louver Remove the axial center bushing of small guide louver. axial center bushing Remove the rotating shaft of small guide louver from the groove.
Page 78 Service Manual Steps Procedure panel, to remove the display. 5.Remove front case Remove the screws fixing electric box cover 2, to remove the electric box cover electric box cover 2 screw screw clamp Remove the screws fixing front panel, and loosen the clamps to remove the front case.
Page 79 Service Manual Steps Procedure 6.Remove swing fan blade Loosen the clamps fixing swing connecting rod, to remove the swing connecting rod. clamp swing connecting rod clamp remove the swing fan blade. swing fan blade 7.Remove electric box sub-assy heat exchanger thermistor Remove the indoor tube temperature sensor.
Page 80 Service Manual Steps Procedure to remove the cover. electric box cover electric box cover sub-assy screw Remove each wiring terminal, and remove the electric box cover sub-assy. 8.Remove evaporator sub-assy auxiliary piping pipe clamp Remove the screws fixing connection pipe clamp, to remove the connection pipe clamp.
Page 81 Service Manual Steps Procedure auxiliary piping Remove the screws fixing evaporator sub-assy, slightly regulate the tube, to remove the evaporator sub-assy. evaporator sub-assy 9.Remove cross fan blade and motor Remove the screws attaching up/down louver stepper motor. up and down swing motor Remove the screws from left and right swing motor to remove the motor.
Page 82 Service Manual Steps Procedure Remove the screws holding the blower motor clamp. screw motor clamp Remove the cross fan blade and motor. bearing rubber grommet base Remove rubber grommet from bearing assembly. cross fan blade motor Loosen the set screw on the motor shaft then remove the blower wheel assembly.
Page 83 Service Manual Steps Procedure Before disassembly of the unit Before disassembling the unit. 2. Remove filter panel Open the panel. air filter Loosen the clasps on filter, push the filter inward and then pull it upward. Then the filter can be removed. hooks air filter...
Page 84 Service Manual Steps Procedure 3. Remove the panel screw Remove the screws fixing display on the panel, to remove the display. display Along the groove fixing front panel, slide the rotor shaft outward to remove the front panel. panel Remove the panel. 4.
Page 85 Service Manual Steps Procedure 5. Remove axial bush Remove the axial bush of horizontal louver to remove the axial bush. Axial sleeve hook Remove axial bush axial bush 6. Remove front case Remove the screw cover of front case, unscrew the eight screws of front case with screwdriver.
Page 86 Service Manual Steps Procedure 7. Remove electric box temperature sensor Remove Temperature Sensor. Twist off the ground wire screw fixing the evaporator. ground wire screw electric box cover 2 Remove the screw of electric box.Take out the electric box cover to separate the electric box cover 2.
Page 87 Service Manual Steps Procedure 8. Remove evaporator sub-assy water tray Loosen the clasps connecting the water tray and chassis, and then remove the water tray. Remove the screws fixing connection pipe clamp, to remove the connection pipe clamp. pipe clamp screw Remove the screws fixing evaporator sub-assy, slightly regulate the tube, to...
Page 88 Service Manual Steps Procedure screws screws Turn over the indoor unit and adjust the pipe line to the position as shown by the broken line. Lift up the evaporator, and then remove the evaporator. evaporator 9. Remove the cross-flow louver and motor Remove the 2 screws of step motor with screwdriver, and remove the step motor.
Page 89 Service Manual Steps Procedure Remove screws fixing cross flow blade and motor. Cross flow blade Fan motor Remove the motor sub-assy. Bearing ring Pull out the plug of bearing ring.
Page 90: Removal Procedures For Outdoor Unit
Service Manual 8.2 Removal Procedures for Outdoor Unit 1. Before disassembly 2. Remove top cover Remove the screws connecting top cover, left and right side plate, as well as panel, to remove the top top cover cover. 3. Remove handle Remove the screws connecting handle and right side plate, to remove the handle.
Page 91 Service Manual 4. Remove panel and grille Remove the screws fixing panel, to remove the panel. Remove the screws connecting panel grille and panel, and loosen the clamp, to remove the panel grille. panel grille 5. Remove valve cover Remove the screw fixing valve cover, to remove the cover.
Page 92 Service Manual 6. Remove left side plate Remove the screws attaching the left side panel to the chassis, then remove panel. left side plate 7. Remove cross fan blade Remove the screw nut fixing cross fan blade, remove the gasket and spring cushion, to remove the cross fan blade.
Page 93 Service Manual 9. Remove electric box assy cover electric box Remove screws fixing electric box assy and mid-isolation board, loosen the bonding tie, pull off the wiring terminal, lift to remove the electric box assy. electric box assy 10. Remove electric reactor Remove the screws fixing electric reactor, to remove the electric reactor.
Page 94 Service Manual 12. Remove mid-isolation board Remove the screws connecting mid-isolation board, chassis and condenser assy, to remove the mid-isolation board. mid-isolation board 13. Remove four-way valve assy four-way valve assy Welding cut the spot weld of four-way valve assy, compressor air suction/discharging valve and condenser pipe outlet.
Page 95 Service Manual 15. Remove big and small valve assy Remove screws connecting condenser assy and chassis, to remove the condenser assy. Remove the screws fixing big and small valve, to remove the valves. small valve big valve condenser assy...
Page 96 Service Manual Steps Procedure 1. Remove big handle, valve cover and top cover big handle 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.
Page 97 Service Manual Steps Procedure Remove the screws connecting the outer case with the motor support, isolation plate and chassis; lift the outer case upwards; loosen the clasps of the outer case with right side plate and left side plate, and then remove the outer case. outer case 3.
Page 98 Service Manual Steps Procedure 4. Remove axial flow blade Remove the nut fixing the axial flow blade and then remove the blade. axial flow fan motor support Remove the six screws fixing the motor and then remove the motor. Remove the two screws connecting the motor support and chassis, and then loosen the stopper to remove the motor support.
Page 99 Service Manual Steps Procedure 6. Remove the soundproofing material Remove the self adhesive strip then remove the soundproofing material. soundproofing 7. Remove isolation plate Remove the two screws connecting the isolation plate and condenser side plate; remove the three screws connecting the isolation plate and chassis, and then remove the isolation plate.
Page 100 Service Manual Steps Procedure 9. Remove compressor compressor Remove the three foot nuts fixing compressor and then lift the compressor upwards to remove the compressor and rubber vibration bushings. Note: Keep the ports of discharge pipe and suction pipe from foreign objects. condenser sub-assy 10.
Page 101 Service Manual DHY24CSB21S Steps Procedure 1. Remove big handle, valve cover and top 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. handle valve cover 2.Remove top panel...
Page 102 Service Manual Steps Procedure 4.Remove grille and panel Twist off the screws connecting the grille and panel, and then remove the grille. Twist off the screws connecting the panel, chassis and motor support with screwdriver, and then remove the panel. grille panel 5.Remove right side plate...
Page 103 Service Manual Steps Procedure 7.Remove electric box electric box Twist off the screws on electric box, cut off the tieline with scissors or pliers, pull out the wiring terminal, and pull it upwards to remove the electric box. Remove the screws from the electrical box electrical box enclosure, then remove the enclosure.
Page 104 Service Manual Steps Procedure 9.Remove motor support Twist off the tapping screws fixing the motor support, pull it upwards and then remove the motor support. motor support 10.Remove isolation sheet Twist off the screws connecting isolation sheet and end plate of condenser and chassis, and then remove the isolation sheet.
Page 105 Service Manual Steps Procedure 12.Remove gas valve and liquid valve Twist off the two bolts fixing the valve sub-assy. Unsolder the soldering joint between gas valve and air-return pipe and then remove the gas valve. (Note: Make sure to release all refrigerant first.
Page 106 Service Manual Steps Procedure 15.Remove left side plate Twist off the screws connecting the left side plate and chassis with screwdriver, and then remove the left side plate. left side plate 16.Remove chassis and condenser Pull it upwards to separate the chassis and condenser.
Page 107: Appendix
Service Manual Appendix: Appendix 1: Reference Sheet of Celsius and Fahrenheit Conversion formula for Fahrenheit degree and Celsius degree: Tf=Tcx1.8+32 Set temperature Fahrenheit Fahrenheit Fahrenheit display Fahrenheit display Fahrenheit display Fahrenheit Celsius （℃） Celsius （℃） Celsius （℃）（℉）（℉）（℉） temperature temperature temperature...
Page 108: Appendix 3: Pipe Flaring Method
Service Manual Appendix 3: Pipe Flaring Method Pipe Note: Improper pipe flaring is the main cause of refrigerant leakage. Please Pipe cutter flare the pipe according to the following steps: Leaning Uneven Burr A:Cut the pipe ● Confirm the pipe length according to the distance of indoor unit and outdoor unit. ●...
Page 109: Appendix 4: Resistance Values For Temperature Sensors
Service Manual Appendix 4: Resistance Values for Temperature Sensors Resistance Table of Ambient Temperature Sensor for Indoor and Outdoor Units(15K) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Temp.( Temp.( Temp.( Temp.( -2.2 138.1 18.75 138.2 3.848 208.4 1.071 -0.4 128.6 69.8 17.93 3.711 210.2 1.039 121.6...
Page 110 Service Manual Resistance Table of Tube Temperature Sensors for Outdoor and Indoor(20K) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Temp.( Temp.( Temp.( Temp.( -2.2 181.4 25.01 138.2 5.13 208.4 1.427 -0.4 171.4 69.8 23.9 4.948 210.2 1.386 162.1 71.6 22.85 141.8 4.773 1.346 153.3 73.4 21.85...
Page 111 Service Manual Resistance Table of Discharge Temperature Sensor for Outdoor(50K) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Temp.( Temp.( Temp.( Temp.( -20.2 853.5 120.2 18.34 190.4 4.754 -18.4 799.8 51.8 93.42 17.65 192.2 4.609 -16.6 53.6 89.07 123.8 16.99 4.469 -14.8 703.8 55.4 84.95 125.6 16.36...
Page 112: Appendix 5: Wired Zone Controller
Service Manual Appendix 5: Wired Zone Controller Controller Interface Fig1.1.1 Wired Zone Controller Interface 1.1 Appearance and LCD Icons Fig.1.1.2 LCD Display...
Page 113 Service Manual 1.2 Introduction to the LCD Icons Table 1.1 Symbols Description Swing function Air exchange function (This function is currently unavailable for this unit.) Sleep function (only Sleep 1). Each kind of running mode of indoor unit (auto mode) Cooling mode Dry mode Fan mode...
Page 114 Service Manual Timing value. QUIET Quiet function (Two types: quiet and auto quiet) (This function is currently unavailable for this unit). 2 Buttons 2.1 Layout of Buttons 2.2 Functions of Buttons Table 2.1 Name Function Enter/Cancel Function selection and cancellation. ▲...
Page 115: Mode Setting
Service Manual Upon start-up of a unit that had no malfunction or when the unit is ▲+▼ OFF, press them at the same time for five seconds to enter a lock (Lock) state. In this instance, no other buttons will respond if pressed. Press them again for five seconds to discontinue this condition.
Page 116 Service Manual Fig.3.3.1 Fig.3.4.1 3.4 Fan Setting In the “On” state of the unit, press Fan and then the fan speed of the indoor unit will change sequentially as shown in Fig.3.4.1. Middle High 3.5 Timer Setting In the “On” state of the unitpress the Timer button to set the timer ”Off” on the unit. In the “Off”-state of the unit, press the Timer button to set the timer ”On”...
Page 117 Service Manual Turn on the unit without Timer Press Timer repeatedly until activated. reaching the setting status. Press Enter/Cancel to confirm the setting. Fig.3.5.1 Timer Off” Setting under the “On” State of the Unit Timer “On” setting under the “Off” state of the unit is shown in Fig.3.5.2 below.
Page 118 Service Manual Turn off the unit without Timer Press Timer repeatedly until activated. reaching setting status. Press Enter/Cancel to confirm the setting. Fig.3.5.2 Timer “On” Setting under the “Off” State of the Unit Timer range: 0.5 hr. to 24hrs. Every press of ▲or ▼ will increase or decrease the set time by 0.5 hr.
Page 119 Service Manual Press Function repeatedly until Press Enter/Cancel to activate the reaching the Swing setting status. Swing function. Press Function repeatedly until reaching the Swing function again. Fig.3.6.1 Swing Setting Notes: ①.Access Sleep, Turbo or Blow setting the same as the Swing setting. After the setting has been done, press “Enter/Cancel”...
Page 120 Service Manual Press Function repeatedly until reaching the Sleep setting status. Press Function repeatedly until reaching the Sleep setting status again. Fig.3.7.1. Sleep Setting 3.8 Turbo Setting Turbo function: The unit at the high fan speed can realize quick cooling or heating so that the room temperature can quickly approach the setting value.
Page 121 Service Manual Press Function repeatedly until reaching the Turbo function status. Press Function repeatedly until reaching the Turbo function status again. Fig.3.8.1 Turbo Setting 3.9 E-heater Setting E-heater (auxiliary electric heating function): In the Heating mode, E-heater can be turned on for improved efficiency.
Page 122 Service Manual Press Function repeatedly until reaching the E-heater setting status. Press Function repeatedly until reaching the E-heater setting status again. Fig.3.9.1 E-heater Setting 3.10 Blow Setting Blow function: After the unit is turned off, this function assists in water evaporation to avoid mildew in the indoor unit.
Page 123 Service Manual Press Function repeatedly until reaching the Blow setting status. Press Function repeatedly until reaching the Blow setting status again. Fig.3.10.1 Blow Setting Notes: ①. When the Blow function is activated, if turning off the unit by pressing On/Off or using the remote controller, the indoor fan will run at the low fan speed for two minutes, with “BLOW”...
Page 124: Installation And Removal
Service Manual 4 Installation and Removal 4.1 Connection of Signal Wire of the Wired Zone Controller ● Open the cover of the electrical control box of the indoor unit. ● Place the single line of the wired zone controller through the rubber ring. ●...
Page 125 Service Manual Fig.4.2 Fig.4.2 shows the installation steps for the wired zone controller. Pay attention to the following before completing the installation. 1) Prior to the installation, first DISCONNECT THE POWER SUPPLY of the wire buried in the installation opening. No operation should be performed with the power on during the entire installation.
Page 126: Errors Display
Service Manual 4.3 Removal of the Wired Zone Controller 5 Errors Display If there is an error occurring during 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 in a sequential fashion.
Page 127 Service Manual Discharge temperature sensor open/ Forced defrosting short circuited Indoor and outdoor communication error Compressor startup failure DC bus under-voltage protection High discharge temperature protection DC bus over-voltage protection Overload protection Compressor phase current sensing Whole unit over-current protection circuit error Compressor demagnetization protection Over phase current protection...
Page 129 Product improvement, specifications and appearance in this manual are subject to change without prior notice. LIT - 12012187 © Johnson Controls, Inc. USA...

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