AUX air conditioner service manual
217
Unit Model: ASW-H24A4/TB
Phenomena：Outdoor unit made loud noise according to client
Cause Analysis: according to client, noise made by air conditioner was not so loud in the daytime, but
it was much louder at night. We turned on air conditioner; outdoor unit noise could be heard in the
room. Checked the air conditioner, noise from it was quite normal; but it was installed in balcony,
which was only separated from bedroom by a wall, and air conditioner was installed under the
window and sound could be transmitted directly to the room.
Solution: Moved outdoor unit to a suitable place, noise was reduced.
Experience Conclusion: if possible, do not install outdoor unit, especially large power outdoor unit on
balcony.
Case 15: Heat expansion sound of plastic components
Unit Model: ASW-H12A4/H
Phenomena：When the air conditioner was turned on and off, clap could be heard sometimes.
Cause analysis: indoor unit made clap-like sound, plastic components of indoor unit produces sound
of heat expansion; opened panel and run the air conditioner; noise was eliminated, so we presumed
that water collection pan was too close to plastic panel, which may expand when temperature rises.
Solution: cut brink of plastic water collection pan with knife, turned on air conditioner again, noise
was eliminated.
Experience Conclusion: special faults shall be handled with special methods.
Section two maintenance cases for water leakage of air conditioner
There are various causes for air conditioner water leakage, we should check carefully to find leak
source and deal with the problems accordingly. In general, water leak can be analyzed from following
aspects:
⑴ Air supply system: Filter is blocked by dirt. In moisture environment, if air conditioner is operating
in low wind mode, wind amount is relatively small and indoor evaporation temperature will decrease
and evaporator will be frosted or even frozen. If such condition remains for a long time, air
conditioner will leak.
⑵ Drainage system: mainly includes guiding channel, drain pipe, pipe wrapping and discharge pump
faults, when air conditioner has been used for a long time, guiding channel and drain pipe may be
blocked by dirt, plastic guiding channel may crack, connection joints of pipe may be wrapped
improperly and drain pipe may be flattened, all these will result in water leakage.
⑶ System lacks in refrigerant or evaporator is blocked: when system lacks in refrigerant, refrigerant
will be gasified quickly in 2-3 pieces of U-shaped tubes near inlet tube after it enters evaporator, so
temperature of fins of these U-shaped tubes is relatively low, but temperature of others is close to
room temperature, so water in fins of these 2-3 U-shaped tubes will condense and will freeze after a
long time. When evaporator is blocked by ice, fins of U-shaped tubes with large refrigerant flow will
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