Gree GUD24W2/D-D(U) User manual

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DC INVERTER HEAT PUMP CONDENSING
UNIT SERVICE MANUAL
(GC202301-I)
Capacity: 24kBtu/h~60kBtu/h
Rate Frequency: 60Hz
Operation Range:
Cooling: 5°F(-15°C)~118.4°F (48°C)
Heating: 5°F(-15°C)~75.2°F (24°C)

Foreword
Thank you for choosing Gree U-Match air conditioners. In order to correctly install and use our units, and for
the satisfactory operation effect, please read this manual carefully.
This manual specifies safe operation requirements from perspectives of product introduction, control,
troubleshooting and maintenance, as well as basic principles and implementation methods. Professional
operators must abide by relevant national (local) safety requirements and technical specifications set forth in
this manual during operations; otherwise, the air conditioning system may fail or be damaged, and personnel
safety accident may also occur.
Safety Notice
Before using the air conditioner, please first read the instruction manual.
Before installing the air conditioner, please first read the instruction manual.
Before repairing the air conditioner, please first read the technical service manual.

CONTENTS
1 Product Introduction ......................................................................................................3
1.1 Lists of Units ..........................................................................................................................3
1.2 Electrical Parameters .............................................................................................................5
2 Control.............................................................................................................................6
2.1 Operation Mode .....................................................................................................................6
2.2 Control Mode .........................................................................................................................7
2.3 Functions .............................................................................................................................10
3 Troubleshooting............................................................................................................14
3.1 Wiring Diagrams ..................................................................................................................14
3.2 PCB Layout..........................................................................................................................18
3.3 Error Code ...........................................................................................................................25
3.4 Troubleshooting ...................................................................................................................26
3.5 Failures Not Caused by Errors .............................................................................................60
4 Maintenance..................................................................................................................62
4.1 System Diagram ..................................................................................................................62
4.2 Connection Pipe Vacuum Pumping ......................................................................................62
4.3 Refrigerant Charging............................................................................................................65
4.4 Maintenance of Major Components......................................................................................67
4.5 Removal of Major Components............................................................................................79
4.6 Explosive View and Lists of Parts....................................................................................... 112
Appendices ....................................................................................................................130
1 Resistance/Temperature Lists of Temperature Sensors .........................................130
1.1 Voltage List of 15 KΩ Temperature Sensors.......................................................................130
1.2 Voltage List of 20 KΩ Pipeline Temperature Sensors .........................................................132
1.3 Voltage List of 50 KΩ Discharge Temperature Sensors ......................................................134
2 Temperature/Pressure List of Refrigerant ................................................................137
3 Operation Tools ..........................................................................................................137

GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
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Safety Notice on Maintenance
PROHIBITED：
(1) Do not pierce or burn.
(2) Please note that refrigerant may be odorless.
(3) The appliance shall be stored in a room without continuously operating ignition sources (For example:
open flames, an operating gas appliance or an operating electric heater).
(4) Indoor unit adopts special joints that can’t be detached. The installation method is the same with the
common joints. However, because the joint can’t be detached, if it is badly connected and causes leakage,
it needs to be cut and replaced by a new one through welding.
(5) Using unsuitable parts or tools may lead to electric shock or fire hazard.
(6) If refrigerant leaks during maintenance, please ventilate the room immediately. Heavy leakage may lead to
breathing difficulty, severe injury or death.
(7) Disconnect power before disassembling the appliance for maintenance.
(8) The appliance should be maintained and cared by authorized technical personnel with necessary
qualifications.
WARNING:
(1) If the working place is more than 2m's high, please wear a safety helmet, gloves and a safety belt.
(2) Never mix any other substances except the specified refrigerant into the refrigerant circuit.
(3) When re-locating the appliance, check whether the new location is strong enough to withstand the weight
of the appliance.
(4) If there is refrigerant leak, please fix the leak before charging in the refrigerant. After refrigerant is charged,
check for refrigerant leaks. If you cannot spot the leak, stop the maintenance work. Please evacuate the
system and close the service valve to prevent refrigerant leaking into the room.
(5) Prepare suitable tools and protectors.
(6) If you need to carry out maintenance or check the electric circuit without cutting off the power, please be
careful not to touch the electrical parts.
NOTICE:
(1) If the appliance is maintained at a humid place, it should be grounded to avoid electric shock.
(2) Never repair the unit with wet hands. Operating the unit with wet hands may lead to electric shock.
(3) If the unit is not correctly grounded, please check and fix it.
(4) Before cleaning the unit, please disconnect power to prevent the inner fan from starting up and running at

GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
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high speed; Otherwise personal injury may occur.
(5) Measure the insulation resistance after maintenance. The resistance must be 1M or higher. Bad insulation
may lead to electric shock.
(6) Welding and cutting work must be done in a well-ventilated place.
(7) Gas appliances, heaters and other fire sources should be kept away from the installation and maintenance
site.
(8) Maintenance should be done according to suggestions of the manufacturer.
(9) Maintenance should be done only after the refrigerant is completely reclaimed from the unit.
OBSERVED：
(1) After the maintenance work is done, check the drainage of indoor unit.
(2) Do not tilt the unit, otherwise, water may spill out from the unit and make the floor and furniture wet.
(3) Disassembly of the unit, handling of the refrigerant, oil and accessories should all be done according to
applicable local rules and regulations.
Safety Notice on Operation
PROHIBITED:
(1) Never try to modify the unit, otherwise, it may cause electric shock, overheat or fire hazard.
(2) If the power cord or conducting wires are scratched, please replace them.
(3) Never use connected or extended power cord or share the power socket with other appliances.
(4) Prepare a specialized power circuit for the appliance.
WARNING:
(1) If the power plug is dirty, please clean it before inserting it to the power socket. If the power plug is loose,
please tighten it up.
(2) Do not damage the power cord. A damaged or refitted power cord may lead to electric shock or fire hazard.
(3) Check frequently whether the appliance is in good condition.
NOTICE:
(1) After changing the batteries of remote control, please discard them to avoid being swallowed by children.
(2) When the unit is working, do not remove the fan cover.
(3) Do not use organic solvents to wipe the controller operating panel.
(4) Before cleaning the unit, cut off the power supply.

GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
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1 Product Introduction
1.1 Lists of Units
1.1.1 List of Outdoor Units
Model Power Supply Finished Product Code Appearance
V/Ph/Hz
GUD24W2/D-D(U)
208/230V-1Ph-60Hz
CF090W2280
GUD30W2/D-D(U) CF090W2300
GUD36W2/D-D(U) CF090W2290
GUD42W2/D-D(U) CF090W2310
GUD48W2/D-D(U) CF090W2270
GUD60W2/D-D(U) CF090W2410

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1.1.2 List of Indoor Units
Model Cooling/Heating
Capacity (Btu/h)
Power Supply Finished
Product Code Appearance
V/Ph/Hz
Airhandler GUD24AH2/D-D(U) 24000/24000 208/230V-1Ph-60Hz EH010N0130
Airhandler GUD30AH2/D-D(U) 30000/30000 208/230V-1Ph-60Hz EH010N0160
Airhandler GUD36AH2/D-D(U) 36000/36000 208/230V-1Ph-60Hz EH010N0140
Airhandler GUD42AH2/D-D(U) 42000/42000 208/230V-1Ph-60Hz EH010N0150
Airhandler GUD48AH2/D-D(U) 48000/48000 208/230V-1Ph-60Hz EH010N0120
Airhandler GUD60AH2/D-D(U) 60000/60000 208/230V-1Ph-60Hz EH010N0170
NOTE: 1 Ton =12000Btu/h = 3.517kW

GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
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1.2 Electrical Parameters
Model Power Supply Circuit Breaker Capacity
V/Ph/Hz A
GUD24W2/D-D(U)
208/230V-1Ph-60Hz
30
GUD30W2/D-D(U) 35
GUD36W2/D-D(U) 40
GUD42W2/D-D(U) 40
GUD48W2/D-D(U) 60
GUD60W2/D-D(U) 60
Model Power Supply Fuse Capacity Circuit Breaker Capacity
V/Ph/Hz A A
GUD24AH2/D-D(U)
208/230V-1Ph-60Hz 3.15 15
GUD30AH2/D-D(U)
GUD36AH2/D-D(U)
GUD42AH2/D-D(U)
GUD48AH2/D-D(U)
GUD60AH2/D-D(U)

GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
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2 Control
2.1 Operation Mode
2.1.1 Cooling Mode

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2.1.2 Heating Mode
2.2 Control Mode
2.2.1 Based Control
2.2.1.1 Compressor Control
When cooling or heating mode is turned on, indoor fan will run for a while before the compressor starts.
Under different modes, the compressor can only be stopped after running for some time (special cases excluded).
This is to protect the compressor from frequent start or stop. Once the compressor is stopped, it must not be
restarted right away. Please wait for a few minutes.