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Test Operation & Troubleshooting & Maintenance
5�2 Troubleshooting
Malfunctions
①
Compressor does
②
not start up
③
④
①
Heavy noise of fan
②
③
①
Heavy noise of
compressor
②
Water pump does
①
not run or runs
②
abnormally
③
①
Compressor starts or
②
stops frequently
③
The unit does not
heat although
①
compressor is
②
running
①
Poor efficiency of hot
②
water heating
③
④
5�3 Repair
5�3�1 Key Components
Picture
Reasons
Power supply has problem.
Connection wire is loose.
Malfunction of mainboard.
Malfunction of compressor.
Fixing bolt of fan is loose.
Fan blade touches shell or grill.
Operation of fan is unreliable.
Liquid slugging happens when liquid
refrigerant enters into compressor.
Internal parts in compressor are broken.
Malfunction of power supply or terminal.
Malfunction of relay.
There is air in water pipe.
Poor or excess refrigerant.
Poor circulation of water system.
Low load.
Leakage of refrigerant.
Malfunction of compressor.
Poor heat insulation of water system.
Poor heat exchange of evaporator.
Poor refrigerant of unit.
Blockage of heat exchanger at water side.
Name
Compressor
Electrostatic
Expansion Valve
Phase sequence is reverse.
①
Check out and re-fix.
②
Find out the reasons and repair.
③
Replace compressor.
④
Re-fix fixing bolt of fan.
①
Find out the reasons and adjust.
②
Replace fan.
③
Check if expansion valve is failure and
①
temp. sensor is loose .If that, repair it.
Replace compressor.
②
Find out the reasons and repair.
①
Replace relay.
②
Evacuate.
③
Discharge or add part of refrigerant.
①
Water system is blocked or there is air in
②
it.Check water pump, valve and pipeline.
Clean water filter or evacuate.
Adjust the load or add accumulating
③
devices.
Repair by leakage detection and add
①
refrigerant.
Replace compressor.
②
Enhance heat insulation efficiency of the
①
system.
Check if air in or out of unit is normal and
②
clean evaporator of the unit.
Check if refrigerant of unit leaks.
③
Clean or replace heat exchanger.
④
It is the heart of the cooling system, mainly used to
turn the low-temperature, low-pressure refrigerant
vapor to high-temperature high-pressure vapor and
then discharge it to the evaporator. The two-stage
enthalpy-adding compressor is adopted herein, which
can improve the heating performance of the unit
largely.
It is one of four main components and used to turn
the hi-pressure liquid refrigerant to low-temperature,
low-pressure vapor-liquid mixture and adjust the
refrigerant flow rate entering the evaporator.
12
Troubleshooting
Function