Table of Contents
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Table of Contents
Related Manuals for York DHM42CMB21S
Summary of Contents for York DHM42CMB21S
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Page 1: Service Manual
Service Manual "M" SERIES INVERTER-DRIVEN AIR CONDITIONING UNITS Type Model DHM18CMB21S DHM24CMB21S OUTDOOR UNIT DHM30CMB21S DHM36CMB21S DHM42CMB21S 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 Safety Summary ......i Units and Features 7 Troubleshooting ....21 Malfunction Indicator ...21 Checking and Elimination .. 45 ..45 . ..51 . .58 ........................71 Appendix 1: Resistance Table of Ambient Temperature Sensor........71 Appendix 2: Resistance Table of Tube Temperature Sensors...........72 Appendix 3: Resistance Table of Outdoor Discharge Temperature Sensor......73 ..
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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 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 ● 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 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 1. Units and Features DHM24CMB21S DHM18CMB21S DHM30CMB21S DHM36CMB21S DHM42CMB21S...
- Page 10 DHM18CMB21S DHM24CMB21S...
- Page 11 DHM30CMB21S DHM36CMB21S DHM42CMB21S...
- Page 12 DHM18CMB21S 12-7/16 14-7/8 35-3/32 21-21/32 inch DHM24CMB21S DHM30CMB21S 35-4/32 13-14/32 15-19/32 37-1/4 22-1/16 inch...
- Page 13 DHM36CMB21S 36-7/32 14-9/16 39-1/8 16-13/16 24-1/32 inch DHM42CMB21S 14-1/4 42-13/16 17-5/16 24-27/32 inch...
- Page 14 DHM18CMB21S DHM24CMB21S DHM30CMB21S Outdoor Indoor filter A heat exchanger filter outdoor heat exchanger Four-way valve B heat exchanger filter high pressure switch Note: Not available for 14K/18K model discharge silencer C heat exchanger discharge temperature sensor filter D heat exchanger gas - liquid separator filter Note: Not available for 14K/18K model...
- Page 15 DHM36CMB21S DHM42CMB21S Schematic Diagram of "M" Series Inverter Heat Pump System Heat Exchanger Liquid Receiver Four-way Valve Capillary Oil Separator Outdoor Uint Stop Valve Compressor Gas/Liquid Separator Electronic Expansion Valve Heating Cooling Indoor Uint Heat Exchanger Heat Exchanger Heat Exchanger...
- Page 16 Symbols GROUND DHM18CMB21S 14WH 13WH COMP. LX1-1 LX1-2 WH:WHITE BN:BROWN WARNING BU:BLUE YE:YELLOW Please don't touch any terminal when the voltage BK:BLACK RD:RED of terminal P(DC+) and N(DC-) at AP1 is higher than 30V to prevent the risk of electrical shock! GY:GRAY YEGN:YELLOW GREEN...
- Page 17 DHM24CMB21S AC-L E(PE) LX2-2 LX2-1 COMP WARNING 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! DHM30CMB21S AC-L E(PE) LX2-2 LX2-1 COMP WARNING...
- Page 18 θ θ θ θ RT13 RT12 RT11 RT10 DHM42CMB21S POWER IN/OUT PIPE TEMP. SENSOR E IN/OUT PIPE TEMP. SENSOR D IN/OUT PIPE TEMP. SENSOR C IN/OUT PIPE TEMP. SENSOR B IN/OUT PIPE TEMP. SENSOR A ENVIRONMENT TEMP.SENSOR WIRING BOARD 2-6...
- Page 19 DHM18CMB21S Compressor interface Unit A liquid valve and gas valve Unit B liquid valve and gas valve Compressor overload protector Temperature sensor Compressor electric heater Outdoor fan 4-way valve Chassis electric heater (reserved) Unit A electronic expansion valve Unit B electronic expansion valve Communication interface with indoor...
- Page 20 DHM24CMB21S DHM30CMB21S Compressor interface Temperature sensor interface of unit A liquid valve and gas valve Temperature sensor interface of unit B liquid valve and gas valve Temperature sensor interface of unit C liquid valve and gas valve Temperature sensor interface of unit D liquid valve and gas valve Temperature sensor interface...
- Page 21 DHM36CMB21S...
- Page 22 DHM42CMB21S FA-FE: Terminals of EEV(Electronic Expansion Valve) 12 E1:Terminals of Ground JUMP2: The code of capacity 13 AC-L:Terminals of line wire SA1: Master select switch 14 FUSE1: Fuse 15 N:Terminals of neutral wire T-SENSOR2:Terminals of temperature sensor TUBE-A - TUBE-E:Terminals of tube temperature sensor...
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Page 24: Cooling Mode
DHM18CMB21S DHM24CMB21S DHM30CMB21S 1 Basic Functions of the System 1.1 Cooling Mode 1.1.1 Cooling conditions and process: If the compressor is in stop status and the unit is started for cooling (when one of the indoor units reaches a cooling condition), the unit starts In this instance, the electronic expansion valve, the outdoor fan and the compressor start operation. -
Page 25: Fan Mode
1.3.3 Outdoor fan control in heating mode The outdoor fan starts before 5 seconds of starting of compressor and then it will run in high speed for 40 seconds. The fan should run at every speed for at least 80 seconds. When the compressor stops, the outdoor fan stops after 1 minute. -
Page 26: Overcurrent Protection
2.4 Communication Malfunction Detection of the quantity of installed indoor units: After 3 minutes of energizing, if the outdoor unit doesn't receive communication signal / data, the outdoor unit will react as if there is no indoor unit installed. 2.5 Overcurrent Protection a. - Page 27 DHM36CMB21S DHM42CMB21S satisfies When satisfies a stop energized within seconds of starting the compressor. The outdoor fan will run in middle speed after starting, and then it will ute. When changing heating mode to cooling mode or dehumidification mode, the entire system will stop first, then restart under the...
- Page 28 if the outdoor unit doesn't receive communication signal / data, the outdoor unit will treat as if there is no indoor unit is installed. T recognize the indoor unit is not installed. If the outdoor unit receives the communication particular indoor unit later, the communication malfunction the limit, then the high-pressure switch cuts off and the system twice...
- Page 29 DHM18CMB21S DHM24CMB21S DHM30CMB21S ○ ● Note: : off : on : blink When several malfunctions occur at the same time, they will be displayed in circulation and every malfunction is displayed for 5 seconds. Malfunction description LED1 LED2 LED3 LED4 ○...
- Page 30 ● ● ● Communication failure with Unit A ● ● Communication failure with Unit B ○ ○ ● Communication failure with Unit C ● ○ ● Communication failure with Unit D ○ ● Unit A freeze protection ○ ● ● Unit B freeze protection ●...
- Page 31 Flow Chart: Energize the unit Please check: 1. if the indoor and outdoor heat exchanges are dirty, if there is obstacle to affect the radiation; 2. if the indoor and outdoor fans are running If the above cases are existed? normally;...
- Page 32 (2) PFC protection malfunction Main checking points: ● If the power supply is normal. ● Check if the connection wire of induction is connected well and if the induction is broken. Flow chart: Start Check If the power supply is normal Turn on the unit after the power supply resumes to Power supply is abnormal...
- Page 33 (3) Capacity charging malfunction Main checking points: If the wiring of the induction is connected well and if the induction is broken. ● ● If the mainboard is broken. Flow chart: Energize the unit and wait for 1 min Test the voltage between the two ends of the electrolytic capacitor with the DC shift of the universal meter...
- Page 34 (4) Anti-high temperature and overload malfunction Main checking points: ● If the outdoor ambient temperature is within the normal range. ● If the outdoor fan is running normally. ● If the indoor and outdoor radiation environment is good. Flow chart: Start It is a normal protection, please If the outdoor ambient temperature...
- Page 35 (5) Temperature sensor malfunction Main checking points: If the temperature sensor is damaged or broken. I f the terminal of the temperature sensor is loosended or not connected. I f the mainboard is broken. Flow chart: Start Check whether the wiring terminal between temperature sensor and controller is loosened or poorly contacted? Insert the temperature...
- Page 36 (6) Start failure malfunction Main checking points: If the connection wire of the compressor is connected properly. I f the stop duration of the compressor is sufficient. I f the compressor is broken. ;If the refrigerant charging amount is too much. Flow chart: Energize and start the unit...
- Page 37 (7) Communication malfunction Main checking points: If the connection wire between the indoor unit and outdoor unit is connected well, if the wires inside the unit are connected well I f the indoor mainboard or outdoor main board is broken Flow chart: Communication malfunction of some indoor units...
- Page 38 All the indoor units appear communication malfunction De-energize,check the connection wire of indoor and outdoor unit and the wire of the eletric box is connected correctly Reconnect according to Eliminate the malfunction Connected correctly? the wiring diagram De-energize, check if the connection wire between the outdoor mainboard and the filter board according to the wiring diagram Reconnect according to...
- Page 39 (8) Compressor overload, diacharge protection malfunction Main checking points: If the eletric expansion valve is connected well or it is broken I f there is refrigerant leakage I f the overload protector is broken Flow chart: Start If the overload protector is connected well? Check the resistance between the two ends of the overload protector in ambient temperature, if the resistance is below 1k...
- Page 40 (9) Compressor desynchronizing malfunction Main checking points: If the pressure of the system is too high; If the eletric expansion valve is working normally or it is broken; If the radiation of the unit is good; Flow chart: The unit appears desynchronizing as soon as energizing and starting The stop duration of the compressor is longer than 3min?
- Page 41 DHM36CMB21S DHM42CMB21S an odor your contractor contractor Conditions Causes Corrective Actions Blown fuse or opened breaker. Change the fuse or close the breaker. Power off. Restart the unit when power on. Power supply plug is loose. Plug the power supply properly.
- Page 42 Conditions Causes When restarting the unit soon after The overload protection switch of the it is stopped. unit let the startup delay for three minutes. The unit does not run The unit will stand by for approximate one As soon as power is on. minute.
- Page 43 High Discharge Flash 4 times Outdoor Temp Protection Outdoor & Communication Error Flash 6 times Indoor Indoor Unit Water Flash 9 times Indoor Full Error Refrigerant Quick Quick Special Mode Recovery Mode Flashing Flashing Outdoor Ambient Flash 3 times Outdoor Temp Sensor Error Outdoor Mid-Coil Flash 4 times...
- Page 44 Flash 21 Low Voltage Protection Drive Error times Temp Drift Protection Flash 3 times Flash 3 times Flash 3 times Drive Error Drive Board Ambient Flash 3 times Flash 3 times Flash 3 times Drive Error Temp Sensor Error AC Current Protection Flash 5 times Drive Error Flash 17...
- Page 45 Outdoor Ambient Flash 3 times Outdoor Temp Sensor Error Outdoor Mid-Coil Flash 4 times Outdoor Temp Sensor Error Outdoor Discharge Air Flash 5 times Outdoor Temp Sensor Error Oil Return for Cooling Flash 7 times Special Mode Quick Forced Defrosting Special Mode Flashing Oil Return for Heating...
- Page 46 Unit n indoor pipe midway temperature Flash twice Indoor Table 16 sensor error Indoor Evaporator Temp Sensor Short/ Flash twice Indoor Table 16 Open-Circuit (Air Valve) Unit n indoor unit pipe Flash 22 times Indoor outlet temperature Table 16 sensor error (Liquid Valve) Unit n indoor pipe Flash 19 times...
- Page 47 DHM36CMB21S DHM42CMB21S a certified technician please your distributor...
- Page 48 Malfunction Display: E1 Compressor High Pressure Protection High pressure protection Replace the outdoor Check if the pressure is really high pressure with the Check if pressure switch unit mainboard is abnormal measurement of a manometer Replace pressure switch Refer to Instruction Check if operation mode of indoor unit is Manual of indoor unit properly set...
- Page 49 Malfunction Display: E3 Compressor Low Pressure Protection Compressor Low Pressure Protection Check if the pressure is really low pressure Refer to the high pressure with the measurement of a manometer protection Charge refrigerant according to the amount Check if the refrigerant in the specified in the nameplate and calculated system is sufficient additional amount...
- Page 50 Malfunction Display: E4 Compressor Exhaust High Temperature Protection Discharge temperature protection Measure if temperature sensor’s Measure if compressor’s discharge Replace relevant discharge resistance value is correct temperature has reached 115℃ temperature sensor System pipeline leaks. Please add refrigerant Replace the outdoor according to the amount specified in the nameplate unit mainboard Malfunction Display: E5 Compressor Overheat...
- Page 51 Malfunction Display: E9 Full Water Protection Full Water Protecti o Check if the voltage of liquid Replace the main board of Check if water overflow level switch end is ok the indoor uint Check the liquid level switch Check if the water drainage Check if the voltage of water Replace the main board of pump works...
- Page 52 Malfunction Display: F3 Failure of Outdoor Ambient Sensor Failure of outdoor Ambient sensor Check the direction of the plug Check if the plug of the temperature sensor is correctly and socket connected with socket on the mainboard Remove the sensor to check if the resistance value is ok Replace temperature sensor Replace mainboard of the indoor uint Malfunction Display: F5 Failure of Exhaust Temp.
- Page 53 disassembly securing panel securing panel. panel...
- Page 54 securin loosen the clasp on the right embl and the chassis. Then remove the left embly.
- Page 55 securing four securing Remove the two tapping securing the motor support. Then pull the securing embly securing embl . Then pull the electric box upward to...
- Page 56 insulation Remove insulation Insulation compressor embly. Then embl...
- Page 58 embl embl embl embl...
- Page 59 secur...
- Page 60 panel panel securing panel panel securing securing...
- Page 62 securing securing wrench securing securing...
- Page 63 securing . Loosen the wire binds, pull out the remove the electrical box securing and isolation sheet to remove the PFC...
- Page 64 securing securing...
- Page 65 securing chassis with wrench, as well as the foot cushion securing assem- bly and chassis sub-assembly to remove the embl embl and refrigerant collection pipe to remove E assembly. (Note: Fully pack the big valve when weld cutting to avoid high...
- Page 66 panel panel panel panel...
- Page 67 embl four...
- Page 68 embl securing and then four securing and then four securing assembly and motor support. Then remove the assembly...
- Page 69 assembly embl assembly...
- Page 71 three securing five...
- Page 72 Disassembly and Assembly of Outer Casing Steps Procedures 1. Disassemble the cover plate ① Remove the securing screws on the cover plate by using a screwdriver. ② Remove the cover plate. 2. Disassemble the front panel ① Remove the securing screws on the front panel by using a screwdriver.
- Page 73 Steps Procedures 4. Remove the grille ① Remove the securing screws on the grille by using a screwdriver. ② Remove the grille. 5. Disassemble the outer casing ① Remove the securing screws on the outer casing by using a screwdriver. ②...
- Page 74 Steps Procedures 7． Assemble the disassembled main parts as per the reverse. disassembly order mentioned above Assemble the disassembled main parts as per the reverse disassembly order mentioned above and energize the unit for trial test. Disassembly and Assembly of Compressor Remark: Make sure that there is no refrigerant in pipe system and the power supply is cut off before disassembling the compressor.
- Page 75 Steps Procedures 3. Take down the faulty compressor ① Remove the bolts on the compressor using a socket wrench ② Take down the faulty compressor from the bottom plate. 4. Place the new compressor on the bottom plate and connect the suction inlet and discharge outlet with the pipe system ①...
- Page 76 Steps Procedure 2. Disconnect the 4-way valve and the connected pipe by soldering. Take down the faulty 4-way valve. Disconnect the 4-way valve and the connected pipe with a welding gun. Take down the faulty 4-way valve. 3. Replace the 4-way valve and reconnect it with the pipeline. ①...
- Page 77 Disassembly and Assembly of Electronic Expansion Valve Steps Procedures 1. Remove the electronic expansion valve coil Remove the electronic expansion valve coil by rotating it until the lock is unfixed. 2． Disconnect the electronic expansion valve and the connected pipe by soldering Disconnect the electronic expansion valve and the connected pipe using a welding gun.
- Page 78 Disassembly and Assembly of Vapor Liquid Separator Steps Procedures 1. Disconnect the liquid separator and the connected pipeline Disconnect the liquid separator and the connected pipeline. 2. Remove the liquid separator ① Remove the bolt securing the liquid separator using a socket wrench that fits the bolts .
- Page 83 Product improvement, specifications and appearance in this manual are subject to change without prior notice. LIT - 12012184 © Johnson Controls, Inc. USA...