Daily Operation And Maintenance - Gree EVO Série Manuel D'utilisateur

Mini Chiller

19 Daily Operation and Maintenance

In order to avoid damage of the unit, all protecting devices in the unit had been set before delivery,
so please do not adjust or remove them.
For the first startup of the unit or next startup of unit after long-period stop (above 1 day) by cutting
off the power, please electrify the unit in advance to preheat the unit for more than 8 hours.
Never put sundries on the unit and accessories. Keep dry, clean and ventilated around the unit.
Remove the dust accumulated on the condenser fin timely to ensure performance of the unit and to
avoid stop of the unit for protection.
In order to avoid protection or damage of the unit caused by blockage of the water system, clean
the filter in water system periodically and frequently check water replenishing device.
In order to ensure anti-freezing protection, never cut off the power if ambient temperature is below
zero in winter.
In order to avoid frost crack of the unit, water in the unit and pipeline system not used for a long
period should be drained.
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.
Notes:
The water pressure gage is installed in the returning water line in the unit. Please adjust the
hydraulics system pressure according to next items:
① If the pressure is less than 0.5 bar, please recharge the water immediately;
② When recharging, the hydraulics system pressure should be not more than 2.5Bar.
Malfunctions
Compressor does
not start up
Heavy noise of fan
Heavy noise of
compressor
Water pump does
not run or runs
abnormally
Compressor starts or
stops frequently
The unit does not
heat although
compressor is
running
Poor efficiency of hot
water heating
Troubleshooting
Reasons
Power supply has problem.
①
Connection wire is loose.
②
Malfunction of mainboard.
③
Malfunction of compressor.
④
Fixing bolt of fan is loose.
①
Fan blade touches shell or grill.
②
Operation of fan is unreliable.
③
Liquid slugging happens when liquid
①
refrigerant enters into compressor.
Internal parts in compressor are broken.
②
Malfunction of power supply or terminal.
①
Malfunction of relay.
②
There is air in water pipe.
③
Poor or excess refrigerant.
①
Poor circulation of water system.
②
Low load.
③
Leakage of refrigerant.
①
Malfunction of compressor.
②
Poor heat insulation of water system.
①
Poor heat exchange of evaporator.
②
Poor refrigerant
③
Blockage of heat exchanger at water side.
④
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
33
Troubleshooting
eries