Common Maintenance; Notice At The Beginning Of Use Season; Maintenance At The End Of Use Season; System Vacuum Pumping - Gree GMV-S120WL/A-S Service Manual

7. Common Maintenance

Routine checkup and maintenance can prolong service life of unit, please ask for professional
personnel to conduct maintenance.

7.1 Outdoor Unit Heat Exchanger

Heat exchanger of outdoor unit should be washed regularly that at least once in two months.
Use cleaner and nylon brush to remove dust and impurities; if there is compressed air source, use
compressed air to remove the dust in the surface of heat exchanger. Please do not wash with tap
water.

7.2 Drain Pipe

Regularly check if the drain pipe is blocked, ensure the condensate water is drained smoothly.

7.3 Notice at the beginning of use season

(1) Check if there is blockage in air inlet and outlet of indoor and outdoor units;
(2) Check if the grounding is reliable;
(3) Check if the batteries of remote controller have been replaced;
(4) Check if the air filter has been well installed;
(5) After long-term closedown of unit, before restarting the unit, turn on the power switch of air
conditioner 8 hours before starting operation, so as to conduct preheating of crankcase
of outdoor compressor;
(6) Check if outdoor unit is firmly installed, if there is any faults, please contact with Gree
maintenance center.

7.4 Maintenance at the end of use season

(1) Cut off general supply source of air conditioner unit;
(2) Clean the filter and case of indoor and outdoor units;
(3) Remove the dust and impurities of indoor and outdoor units;
(4) If the outdoor unit gets rusty, smear with paint in rusty place to prevent it from expanding.

7.5 Parts Replacement

Acquire parts from nearby GREE agency or GREE franchiser.

7.6 System Leak Detection

Use soapy water to conduct leak detection, smear the soapy water in possible leaking point
(welding points, spool, joints, etc.), if bubbles appear, it means there is leakage, please weld or
repair.
If leaking point cannot be detected with soapy water, use electronic leak detector or charge
2
20Kgf/cm of nitrogen into system and put it into water tank to detect leakage.

7.7 System Vacuum Pumping

(1) Conduct vacuum pumping with vacuum pump, operation are as below:
1) Unscrew the nut cap of refrigerant charging spout in inhalation tube;
2) Connect low pressure soft tube of vacuum gauge to joint of refrigerant charging spout;
3) Connect joint of intermediate tube of vacuum gauge to pressure soft tube, connect
another end of soft tube to vacuum pump;
4) Screw up the high pressure gauge and open the low pressure gauge, energize the
vacuum pump;
5) When the indicating needle of vacuum pump points at 15mmHg (gauge pressure),
screw up the low pressure gauge and turn off the power supply, unscrew the soft tube
in regfrigerant charging spout and cover with nut cap.
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