Air-to-water Heat Pump
27
When the water tank has been installed but the water tank is set to “Without”, functions relative with
the water tank will not work and the displayed water tank temperature will always be “-30”. In this case,
the water tank would suffer frostbite and even other severe influences under low temperature. Therefore,
once the water tank has been installed, the water tank must be set to “With”, otherwise GREE will not be
responsible for this abnormal operation.
Never frequently make the unit on/off and close the manual valve of the water system during
operation of the unit by users.
Ensure frequent check to the working condition of each part to see if there is oil stain at pipeline joint
and charge valve to avoid leakage of refrigerant.
If malfunction of the unit is out of control of users, please timely contact with authorized service
center.
Malfunctions
Reasons
Troubleshooting
Compressor does not start up
Power supply has problem.
Connection wire is loose. Malfunction of
mainboard. Malfunction of compressor.
Phase sequence is reverse.
Check out and re-fix.
Find out the reasons and repair. Replace
compressor.
Heavy noise of fan
Fixing bolt of fan is loose.
Fan blade touches shell or grill. Operation
of fan is unreliable.
Re-fix fixing bolt of fan.
Find out the reasons and adjust. Replace fan.
Heavy noise of compressor
Liquid slugging happens when liquid
refrigerant enters into compressor.
Internal parts in compressor are broken.
Check if expansion valve is failure and temp.
sensor is loose. If that, repair it.
Replace compressor.
Water pump does not run or
runs abnormally
Malfunction of power supply or terminal.
Malfunction of relay.
There is air in water pipe.
Find out the reasons and repair. Replace
relay.
Evacuate.
Compressor starts or stops
frequently
Poor or excess refrigerant.
Poor circulation of water system. Low
load.
Discharge or add part of refrigerant.
Water system is blocked or there is air in it.
Check water pump, valve and pipeline. Clean
water filter or evacuate.
Adjust the load or add accumulating devices.
The unit does not heat although
compressor is running
Leakage of refrigerant. Malfunction of
compressor.
Repair by leakage detection and add
refrigerant.
Replace compressor.
Poor efficiency of hot water
heating
Poor heat insulation of water system.
Poor heat exchange of evaporator. Poor
refrigerant of unit.
Blockage of heat exchanger at water side.
Enhance heat insulation efficiency of the
system.
Check if air in or out of unit is normal and
clean evaporator of the unit.
Check if refrigerant of unit leaks. Clean or
replace heat exchanger.
13.1 Recovery
When removing refrigerant from a system, either for servicing or decommissioning, it is
recommended good practice that all refrigerants are removed safely.
When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery
cylinders are employed. Ensure that the correct number of cylinders for holding the total system
charge are available. All cylinders to be used Ensure that the correct number of cylinders for holding
the total system charge are available. All cylinders to be used are designated for the recovered
refrigerant and labeled for that refrigerant (i.e. special cylinders for the recovery of refrigerant).
Cylinders shall be complete with pressure relief valve and associated shut-off valves in good working
order. Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.
