AUX air conditioner service manual
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Symptom is: when air conditioner is switched on, fuse protector breaks or air protector trips
immediately. There’re three reasons for this symptom:
a) Because motor stator windings have burn out, and insulation layer of electromagnetic loop has been
broken and windings touch the motor shell and are short circuited. These faults are caused by long
term overload running of air conditioner, at the same time, protector is broken, so windings run on the
over heat condition for a long time, insulation layer has been damaged;
b) Coils are short circuited which cause disruption of insulation layer of part of coils around the stator
winging, and some coils touch the shell. All the faults are caused by slight damage of some coils, scar
of which expands and disrupts insulation layer;
c) Short circuit: Insulation layer of power wire of motor is damaged or cut off and short circuited.
d) Insulation layer of stator windings has aged severely but hasn’t burned out. It symptom is different
from the former one: it can run 1~2 minutes, then fuse protector is burned or air protector trips. With
same reason, this kind of motor can’t work like motor with burnt windings.
④ Abnormal noise can be heard when air condition is running
When air conditioner runs, steady, low and rhythmic noise is inevitable. If it creates unpleasant noise,
it is abnormal. If it is not handled in time, components will be damaged, so we must pay attention to it.
Components loose and clash with each other, and create noise, generally, exhaust tube will clash with
pump shell, pistol clashes with valve plate and stator abrades with rotator. In addition, magnetic noise
may be created by motor.
Section 4 Cases of Refrigerating System Troubleshooting
Case 1: Capillary of outdoor unit is blocked by ice
Unit Model：ASW-12A4/H
Phenomena：Cooling fault
Cause Analysis: we went to client’s home to fix the air conditioner. It can cool when it was turned on,
after about 25 minutes, pressure and current of air conditioner decreased. According to the client,
compressor was replaced before, so compressor functioned well. Because cooling was normal in the
first 25 minutes, so we presumed that system was blocked by dirt or ice. Open top cover plate of
outdoor, we found that capillary outlet was frosted. Heat the frost with lighter, pressure and current
returned to the normal value, so we judged that system was blocked by ice. According to the client, it
was raining when the compressor was replaced, and water entered the system.
Solution: recover refrigerant to outdoor unit and install desiccation filter on the low pressure tube; run
the air conditioner until ice is removed completely. Remove desiccation filter and start the air
conditioner again, it can cool normally.
Experience Conclusion: water shall be prevented from flowing into system when maintenance
personnel are fixing the air conditioner, or it is likely that system will be blocked by ice. If capillary
inlet is frosted, the system has been blocked by dirt, if capillary outlet is frosted, blocked by ice.
Case 2: Capillary of outdoor unit was blocked by dirt
Unit Model：ASF-H24B4/FS
Phenomena：Poor cooling efficiency
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