Daily Operation And Maintenance - Gree EVO S Series Owner's Manual

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:
(a) If the pressure is less than 0.5 bar, please recharge the water immediately;
(b) When recharging, the hydraulics system pressure should be not more than 2.5 Bar.
Malfunctions
• Power supply has problem.
Compressor does • Connection wire is loose.
not start up • Malfunction of mainboard.
• Malfunction of compressor.
• Fixing bolt of fan is loose.
Heavy noise of
• Fan blade touches shell or grill.
fan
• Operation of fan is unreliable.
• Liquid slugging happens when liquid
Heavy noise of
refrigerant enters into compressor.
compressor
• Internal parts in compressor are broken.
Water pump does • Malfunction of power supply or terminal.
not run or runs • Malfunction of relay.
abnormally • There is air in water pipe.
Compressor • Poor or excess refrigerant.
starts or stops • Poor circulation of water system.
frequently • Low load.
The unit does not
heat although • Leakage of refrigerant.
compressor is • Malfunction of compressor.
running
• Poor heat insulation of water system.
• Poor heat exchange of evaporator.
Poor efficiency of
• Poor refrigerant
hot water heating
• Blockage of heat exchanger at water
side.
Troubleshooting
Reasons
37
Troubleshooting
• Phase sequence is reverse.
• Check out and re-fix.
• Find out the reasons and repair.
• Replace compressor.
• Re-fix fixing bolt of fan.
• Find out the reasons and adjust.
• Replace fan.
• Check if expansion valve is failure and
temp. sensor is loose .If that, repair it.
• Replace compressor.
• Find out the reasons and repair.
• Replace relay.
• Evacuate.
• 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.
• A d j u s t t h e l o a d o r a d d a c c u m u l a t i n g
devices.
• Repair by leakage detection and add
refrigerant.
• Replace compressor.
• 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.
eries