AUX air conditioner service manual
214
Unit Model: ASW-12A4/A
Phenomena：Indoor Noise
Cause Analysis: the air conditioner was newly installed; according to client, noise of indoor unit was
loud. Maintenance personnel of service network visited the client and checked the air conditioner
many times and believed the appliance worked well, so client was unhappy. We checked the air
conditioner and found that air blades made noise sometimes. We adjusted the position of air blades,
and added some lubricate, the air conditioner worked well since then.
Solution: adjusted position of air blades, and filled with some lubricant
Experience Conclusion: if maintenance personnel suspect noise is caused by air blades, he can stop
swing of air blades, and sees if noise still can be heard. Main causes for noise from air blades are: 1. it
is fixed too tightly, 2. there’re burrs on transmission pole3. Concentricity of air blades is not so good.
If maintenance personnel find the cause, he can deal with the problem accordingly.
Case 7: Outdoor fan motor noise
Unit Model: ASW-H12A4/HY
Phenomena：Outdoor unit made abnormal sound and vibrated
Cause Analysis: broke off compressor and run outdoor fan, noise still could be heard. Removed the
blades, run the fan again, we found that poor concentricity of bearings made them collide with each
other and made noise. We replaced outdoor fan motor, and abnormal sound was eliminated.
Solution: replaced outdoor fan motor
Experience Conclusion: small fault is likely to be neglected, generally, people believe that vibration of
outdoor unit is caused by unbalance of fan blades, but in fact, improper clearance of air outlet grille
also can cause noise. So maintenance personnel should check carefully so as to reduce the chance of
making mistake.
Case 8: Noise caused by vibration and collision of copper tube
Unit Model: ASW-12A4/HSY
Phenomena：Copper tube vibrated and made noise
Cause analysis: turned on the newly installed air conditioner, found that outdoor unit vibrated
abnormally, opened the shell, we found that compressor, fan motor and fan run normally; touched
copper tube, it vibrated severely, so it was copper tube making noise.
Solution: applied anti-vibration agent on copper tube
Experience Conclusion: generally, exhaust tube and air returned tube are likely to vibrate when air
conditioner operates, which can be checked visually or touched by using screwdriver. Install damp
piece or insulation sleeve on the position vibrating most severely. Noises of tube are caused by
following reasons:
⑴ Copper tube is too close to compressor, and when compressor runs, it causes tube vibrating. We
can install insulation sleeve on the tube；
⑵ Copper tube is too close to sheet-metal pieces, vibration of compressor causes collision between
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