GREE

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	GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI Add: West Jinji Rd, Qianshan, Zhuhai (postcode: 519070)

	Tel: 0086-756-8614 883 / 0086-756-8522 218 Fax: 0086-756-8614 998 / 0086-756-8615 406 Domestic After-sales Service Tel: 4008 365 315

	Overseas Sales Inquiry Service: gree@gree.com.cn Overseas After-sales Service: global@cn.gree.com

GREE Overseas After-sales Service Center

FAQ

FAQ for Commercial Air Conditioners +

What to do when evaporating pressure is too low?

Reason: It may be cool water not enough; or cool load low; or failure occurred at throttle orifice; or heat transfer at heat transfer tube of evaporator bad for the pollution like furring; or lack of refrigerant.
Solution: Check the cool water circuit and refill the cool water to rated volume; or check the rated temperature at auto on/off device; or check if expand throttle is blocked; or clean the heat transfer tube; or fill the refrigerant to needed volume.

What to do when condensing pressure is too high?

Reason: It may be cooling water not enough; or capacity of cooling tower reduced; or temperature of cool water too high; or cooling capacity too high to increase the load at condenser; or non condensed gas exist; or heat transfer at condensing tube bad for the pollution like furring.
Solution: Check the cool water circuit and adjust it to rated current flow; or check cooling tower and expand throttle etc. to lower (or rise) the temperature of cool water to rated temperature as soon as possible; or get rid of non condensed gas; or clean the tube.

What to do when the difference of oil pressure is too low?

Reason: It may be oil filter blocked; or oil pressure adjusting valve (gate gurgle valve) opened too wide; or outlet oil at oil pump decreased; or bearing abrades; or failure occurred at oil pressure meter (or sensor); or too many refrigerant mixed into lubricating oil (oil pressure is too low for oil bubbles when starting).

Solution: Change the core of oil filter; or tighten the oil pressure adjusting valve so that the oil pressure rise to rated pressure; or disassembly to check; or change the bearing; or check oil pressure meter, reset the pressure sensor and change it when necessary; or do apply the oil heater when cooler stops to maintain rated oil temperature (check if wire of oil heater is breaking, and if the set temperature for oil heater to heat is correct).

What to do when cool water is subcool?

Reason: It may be cool water not enough; or cool load low
Solution: Check the cool water circuit and refill cool water to rated volume; or wait for cool load rise.

Over load at oil pump

Reason: It may be oil pump broken; or resistance at oil circuit too great.
Solution: Disassembly the oil pump to check; or check the oil circuit system like oil filter and other components, change them when necessary.

What to do when oil temperature is too high?

Reason: It may be cooling capacity of oil cooler lowered; or refrigerant supply for cooling oil cooler not enough for refrigerant filtering net is blocked; or bearing abrades.
Solution: Adjust oil temperature adjusting valve; or clean refrigerant filtering net; or disassembly to repair or change bearing.

What to do when water failure occur?

Reason: It may be cooling water not enough; or failure at differential meter
Solution: Check cool water pump and cool water circuit and adjust to normal flow volume; or check and repair differential meter.

What to do when winding for main motor is superheat ?

Reason: It may be power phase voltage unbalance; or voltage drop at power cord large; or operating with ultra low head; or refrigerant supply for cooling main motor not enough for refrigerant filtering net is blocked.

Solution: Take measures to make power phase voltage balance; or take measures to lower voltage drop at power circuit; or clean the refrigerant filter net.
Heating performance is bad +

Abnormal of control circuitry

Contact the service center

The outdoor environment temperature is lower than -5℃

Affect the function of air conditioner

Heat pharmaceutical leaks

Contact service center

Room temperature is set too low to heat

Increase the set temperature

Doors or windows aren’t close well

Close the door or window to preserve cool (heat)

Air filter is dirty or blocked

Clean filter to improve airflow
Big oscillation or noise is too loud +

Screw is loose

Tighten the screw

There are foreign objects on the unit

Remove the foreign objects

Bracket of the unit is not installed steadily

Fix the bracket or reinstall it

Unit is not placed well

Adjust the location of the units

Compressor is not installed well, or the floor stand is not firm enough

Check if the floor stand is firm
LCD flashes or full screen display when pressing the Transmit button +

Change battery

Low battery
Incomplete of the display in LCD +

Fix the frame case well

The LCD frame case is not fixed well
The receiving distance of wireless remote controller is short +

Low battery

Change the battery
Wireless remote controller can’t receive signal (remote control type window unit) +

Wireless remote controller has malfunction

Change wireless remote controller

Breakage or bad connecting of the receiving terminal

Change receiving terminal or adjust connecting wire of receiving terminal

Receiving terminal is loose

Adjust the receiving terminal
The treatment taken by protector when the compressor is over heated +

Protector is in error

Check if the contact points are connected by multimeter when the compressor is not over heated, if it isn’t connecting, change protector

Compressor cannot run smoothly, crankshaft jammed or breakage of discharge valve

Change compressor

Capillary is blocked and inspiration temperature increases

Change capillary

Refrigerant is not enough or too much

Adjust the amount of refrigerant
No response after energization +

Integrated modular CPU broken

Change integrated modular CPU

Cool joint or breakage at manostat 7806

Change manostat 7806

Crystal oscillator or resetting circuit element is broken

Change them

Commutate diode is broken

Change commutate diode

Transformer is broken

Change the transformer

Blow of the fuse

Change fuse
The compressor can’t startup after energization +

Compressor is open-circuit or short-circuit

Change compressor

Wrong wire connection

Reconnect the wire

The main On/Off switch is broken

Change the main On/Off switch

Compressor capacitor is broken

Change compressor voltage

Set temperature of temperature controller is too high or temperature controller is broken

Decrease the set temperature of temperature controller or change the temperature controller

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