AUX air conditioner service manual
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Phenomena：Air conditioner leaked water after running for some time, evaporator was frosted or
frozen.
Cause Analysis: according to client, indoor unit leaked water. We turned on air conditioner and
observed, after 10 minutes, water started to be blown from indoor fan. Disassembled shell, we found
that 2-3 U-shaped fins near evaporator were very cold and covered with condensate, and other fins
were not so cold; turned on the air conditioner again, and it run in refrigeration mode for more than 20
minutes, fins near evaporator were frosted slightly. System pressure was very low (3KG), so system
lacked in refrigerant seriously; refrigerant gasified in fins near input tube when it flew into evaporator,
so temperature of these fins were very low, but temperature of other fins closed to room temperature,
and then fins of low temperature produced condensate, which was blown through outlet with wind; 20
minutes later, evaporator was frosted or frozen.
Solution: checked leak sources and found that connection tube was not connected correctly with low
pressure valve body, and so lock position of nut leaked refrigerant. Connected the tube again and
tighten the nut, vaccumized the system and filled with refrigerant, air conditioner worked well since
then.
Experience Conclusion: air conditioner leaks water, if indoor heat exchanger doesn’t leak air, touch
heat exchanger at different positions to judge whether there’s obvious temperature difference, so as to
judge whether condensate is caused by system problem (generally, if water leak is caused by system
problem, we can see tiny beads inside air duct and obvious beads c on fan blades.)
Case 10: Evaporator was half-blocked and leaked water
Unit Model: ASW-12A4/HSFY
Phenomena：Air conditioner leaked water after running for some time
Cause Analysis: according to client, air conditioner leaked water after running for some time. We
turned on the air conditioner and it run for 20 minutes, water started to be blown form indoor unit.
Disassembled front shell, we found that 2-3 U-shaped fins near evaporator were very cold and covered
with condensate, and other fins were not so cold, so we suspected that system lacked in refrigerant.
Measured system pressure, but it was normal. Later, we found that these fins were covered with beads.
Putting hand on air outlet, we could feel there’s water flowing out with air; we touched fins with
hands, and found temperature of different fins was different obviously, so we suspected that part of
evaporator was blocked and caused deflection of refrigerant; temperature of fins with large refrigerant
flow was low, and that of fins with small refrigerant flow was high, and large temperature difference
cause fins with large refrigerant flow condensed and water was blown outside with wind.
Solution: replaced evaporator after consulting with client, air conditioner worked well since then.
Experience Conclusion: it is easy to judge water leak because of partial block or weld block: whole air
duct is full of tiny beads, and beads can also be seen on fan blades.
Case 11: System leaked air
Unit Model: ASW-H12B4/HDY
Cause analysis：We operated the newly installed air conditioner, fan blades of indoor unit sprayed
beads. We checked and found that air conditioner was installed on a level plane, water pipe was
smooth, and water drain tube could discharge water normally. We opened indoor unit shell, checked
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