AUX air conditioner service manual
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condenser, so refrigerant leaked out.
Solution: repair-welded leak source and added refrigerant
Experience Conclusion: when air conditioner is running, system pressure is zero, we can judge that
refrigerant leaks out; generally, oil stain can be seen on leak sources. Maintenance personnel shall be
familiar with blinking conditions of indicator.
Case 10 Weld of U type tube of condenser leaked
Unit Model：ASW-H12B4/HY
Phenomena: failed to cool
Cause Analysis: air conditioner was used less than one month, cooling efficiency was unsatisfactory.
Checked the air conditioner, temperature of compressor was relatively high; current was 3A, low
pressure was 3kg, outdoor fan run normally. We presumed that system was blocked, leaked or return
gas and discharge capacity of compressor was quite unsatisfactory. We brought air conditioner to
Maintenance Office, purged the system with nitrogen, checked leak sources under high pressure and
found that weld of U type tube under condenser leaked.
Solution: repair-welded, vacuum the system and filled the system with refrigerant.
Experience Conclusion: air conditioner has been used for a short time, but refrigerating efficiency is
unsatisfactory, in most cases, system leaks, so firstly we shall check leak source.
Case 11 Four-way valve was broken
Unit Model：ASF-H24B4
Phenomena：Air conditioner produced heat once it was started up.
Cause Analysis: once we turned on the air conditioner, it worked in heating mode. It was a new
appliance, so we presumed that four-way valve had some problems. We checked circuit, and it was
connected correctly; coil resistance of four-way valve was normal and conducted electricity well, so
four-way valve was blocked: because it was a new appliance, there’s very low chance that four-way
valve was broken. We knocked the four-way valve and started the air conditioner repeatedly; it still
failed to work properly. So finally we confirmed that four-way valve was broken.
Solution: replace four-way valve
Experience Conclusion: don’t replace four-way valve easily, slightly blocked phenomena can be fixed
by simply physical method, especially for the appliance used for a short time.
Case 12 the retaining valve was broken
Unit Model：ASW-H18A4/ III
Phenomena: Poor cooling efficiency
Cause Analysis: voltage of client’s house was 220v. According to client, room was not cooled down
although air conditioner had worked for some time. We checked the air conditioner, low pressure was
0.65Mpa, being relatively high. We released refrigerant until the pressure was 0.55Mpa, cold wind
from outlet of indoor unit was weak, and work current was 7.3A, which was normal. We touched high
and low pressure copper tubes, low pressure tube became colder, but high pressure tube was not cold,
so there’s no failure in compressor. At that time, pressure increased to 0.36Mpa, we touched 4 copper
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