AUX air conditioner service manual
200
③、Weld high pressure tube first, and then the middle one of three low pressure tubes, finally left and
right tubes;
④、Select proper welding machine, flame shall be adjusted and can weld the valve immediately. Pack
the valve body with wet towel to avoid burning rubber and nylon sealing elements in it and causing
the leakage of four-way valve.
⑤、；Weld the tube one by one and start welding the second one after the first one cools down.
Welding shall be performed quickly and finished before temperature of four-way valve rises;
⑥、After four nozzles have been welded, clean the welds with wet tower, at the same time, lower the
temperature of four-way valve. Check the weld quality and adjust the angles of four tubes.
2. Troubleshooting for the compressor
⑴ Replace of compressor
If totally enclosed compressor has some fault, because its components can’t be bought easily, so even
motor is broken and renew the loop, the quality of compressor still can’t be ensured. Therefore,
compressor shall be replaced. During replacement of compressor, following 6 aspects shall be
complied with:
① New compressor shall be of the same type and specification as the old one. If unavailable, main
performances and characteristics of the new compressor, including nominal cooling capacity (same
work condition), power and capacity (voltage, phase number & frequency and current) of motor and
capacity of capacitor shall be same and similar as the old one,;
② Efficiency of new compressor shall be not lower than the old one;
③ Power voltage shall be based on the demand of client;
④ Refrigerant shall not be changed;
⑤ Outside dimension shall be same or similar to old one so that it can be installed on original
position.
⑥ Basement dimension shall be the same. If unavailable, basement shall be adjusted based on the old
dimension. Direction and position of discharge tube and return gas tubes shall be same or similar as
the old one. If unavailable, tube dimension shall be changed.
⑵Troubleshooting for totally enclosed compressor
① Poor refrigerating efficiency
Actual discharge capacity of compressor lowers and can’t reach the nominal capacity of product and
meet the original cool load. There are four factors for the poor refrigerating efficiency:
a) Severe abrasion of pistol and cylinder (including rotating type): Requirement of clearance between
pistol and cylinder is very strict, grease film inside is for lubrication and sealing. If clearance is too
wide, grease film will be broken and cause gas leakage; if clearance is too narrow, grease film may be
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