AUX air conditioner service manual
220
Cause analysis：We turned on air conditioner, found that air pipe of indoor unit leaked, especially on
left and right ends. This air conditioner adopted four-folded evaporator, two water collection channels:
upper and down, upper channel was on the back of evaporator, where a water barrier guided water to
upper channel, condensate flew from two ends of water barrier, which were affixed with sponge, to
indoor unit.
Solution: adjusted sponge on water barrier; air conditioner did not leak again.
Experience conclusion: ED-Series air conditioner adopted four-folded evaporator, leak of which is
caused by many factors, including following aspects:
⑴ Guiding plate is not installed (in such case, air conditioner leaks badly, condensate will be blown or
flown from air duct.)
⑵ Tubing angle of evaporator is not proper;
⑶ Sponge on evaporator has fallen off.
⑷ Evaporator and plastic mould basement fail to fit tightly
⑸ Sponge on water guiding plate is not affixed properly.
During maintenance, we should check air conditioner carefully to find leak source and find water leak
condition: dropping or weeping, and then deal with the problems accordingly; in this way, we can get
twice the result with half effort.
Case 5: Condensate leaks from connection line joint
Model No: ASW-H12A4/HB
Cause analysis：Water dropped from connection tube in indoor unit, we suspected condensate leaked.
We checked the air conditioner and found that insulation sleeves of high and low pressure connection
tube of indoor unit were of poor insulation efficiency, which caused leak of condensate. Solution:
Re-wrapped connection tube joints with insulation sleeves (the more belt is wrapped, the better
insulation efficiency will be).
Experience Conclusion: insulation sleeve and tube are of same length when air conditioner leaves
the factory, so before wrapping connection tube, power wire and water drain line, and maintenance
personnel shall measure length difference between inlet and outlet tubes of evaporator, reserve space
for connection tube. Because expansion capacity of insulation sleeve is different, to obtain good
insulation effect, we shall wrap insulation tightly with belt, so that insulation sleeve on tube joint will
not be loose and cause joint cap being exposed and leaking water. In addition, tube joint shall be
affixed with water-proof adhesive tape, or it is likely to leak. Foregoing leak is caused by improper
installation, so for newly installed air conditioner, such problems shall be noticed.
Case 6: Water drain tube was flattened and leaked
Unit Model: ASW-H12A4/H
Cause Analysis： According to client, the newly installed air conditioner leaked water. We checked
and found that indoor unit was installed in a level plane; the hole on the wall was lower than indoor
unit and drain tube of indoor unit was not broken; later, we found that discharge amount of outdoor
drain tube was relatively small, but indoor unit leaked water, so water drain tube might be obstructed.
For it was a new air conditioner, it’s impossible that the system had been blocked. Finally, we found
that water drain tube was wrapped under other lines as all lines penetrating the hole on the wall, so
water couldn’t flow smoothly and water drain tube leaked.
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