1 Safety Principle of 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.
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 unit grounded during maintenance.
7. When carrying the refrigeration steel cylinder to the user’s place, the refrigeration inside shall not exceed the rated
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.
(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”.
2 Preparation before Maintenance
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 unit
(1) Ensure that the unit is reliably grounded.
(2) Ensure that the power supply of the unit 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 unit 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.
5. Check List
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