37
Maintenance
Service Manual
1 Safety Principle of Maintenance
2 Preparation before Maintenance
1. The maintenance spot must have good ventilation. Do not close the door or the window.
2. Do not use naked flame, including welding, smoking. Do not use mobile phone. Tell the user not to cook with naked flame.
3. Take antistatic measures, including wearing pure cotton clothes and gloves etc.
4. If flammable refrigerant leakage is found during maintenance, it is a must to reinforce ventilation, and block the leak source.
5. During maintenance, it is necessary to keep the spot safe when fetching the lacked spare parts.
6. It is necessary to keep the case of the air conditioner grounded during maintenance.
7. When carrying the refrigeration steel cylinder to the user’s place, the refrigeration inside shall not exceed the rated value. The steel
cylinder must be vertical and away from the heat source, fire source, radiation source and electric appliance.
8. It is necessary to carry the unit to the service center for maintenance, when
(1) inner refrigerant pipe must be welded;
(2) disassembling the heat exchanger; e.g. replacing chassis of outdoor unit, removing condenser;
(3) replacing compressor or components of cooling system.
9. The maintenance irrelated to refrigerant vessel, inner refrigerant pipe and cooling component can be performed in the user’s place,
including cleaning the cooling system and sludging.
10. Ensure that the density tester is working during maintenance.
11. Ensure there is necessary safety precaution and emergency measures on the spot. Put suitable fire extinguishers(CO2 or dry
powder) in the nearest area.
12. There must be natural ventilation in the maintenance spot.
13. The maintenance staff shall take safety actions.
14. Paste suitable signs such as “No Smoking” and “No Entry”.
1. Inspection of Environment
(1) Ensure that electric product with radiation is power off in the maintenance area. All the persons in the room shall turn off the mobile
phone.
(2) Check if there is refrigerant leakage in the maintenance area. Ensure that all the leak testers are suitable for this air conditioner.
(3) Ensure that the room area reaches the requirement.
(4) Check if the maintenance area is ventilated. Keep the room ventilated.
2. Inspection of Air Conditioner
(1) Ensure that the air conditioner is reliably grounded.
(2) Ensure that the power supply of the air conditioner is cut off. Discharge the electricity of the capacitor. If power supply is necessary,
perform leak test to prevent the potential danger.
3. Inspection of Maintenance Equipment
(1) Check if the maintenance equipment is suitable for the refrigerant. Only the special equipment recommended by the air conditioner
supplier can be used.
(2) The set alarm density of the leak tester shall not be higher than 25% of the LEL. The tester must keep operating during maintenance.
4. Leak Test before Maintenance
(1) After cutting off the power supply, perform leak test with the recommended leak detector or density tester (pump suction type) (ensure
the equipment is calibrated; leakage ratio of leak detector is 2g/year.)
Note: do not use resolvent with chlorine in case causing corrosion of the steel pipe.
(2) If leakage is found, remove all fire source ensure good ventilation of the area.
5. Check List
No.
Check information
Result
Yes/No
1
Maintenance equipment is complete
2
Persons in the maintenance area turn off the mobile phone.
3
Power supply of tools is 2m away.
4
Density tester can be used.
5
Other tools are normal.
6
Maintenance staffs are qualified.
7
The spare parts are provided by the manufacturer and qualified.
8
The air conditioner needed to be serviced is under safe state.
9
The wire of power socket is reliably connected.
10
There is natural ventilation in maintenance area.
11
There is no operating electric appliance or naked flame within
2m of Maintenance area.
