AUX air conditioner service manual
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and found that evaporator and basement were assembled properly, but there’s a leak between left
bracket and left fin of evaporator, which leaked air. Affixed the leak with sponge and turned on air
conditioner again. Water leakage was reduced, but fault hadn’t been eliminated. Opened indoor unit
panel again, and checked temperature of different streams of evaporator and U shaped fins and found
that temperature difference was very large, so flow deflected in evaporator. Checked air return
pressure of low pressure valve and found that it was very low (3kg).
Solution: filled the system with refrigerant until system pressure exceeded ambient pressure; run air
conditioner for 20 minutes, there’re no beads seen on fan blades, so fault had been eliminated.
Experience Conclusion: if air returned temperature and air outlet temperature is different obviously,
and return air way of evaporator is large, hot air will mix in air chamber and produces condensate,
which will attach on fan blades and sprays outside the unit. If surface temperature of evaporator is
uneven, same fault will occur. We can handle the problem of uneven temperature on the surface of
evaporator by increasing or decreasing refrigerant according to air returned pressure of low pressure
valve and ambient temperature. If temperature difference on evaporator exceeds 9 Celsius Degree,
evaporator is blocked partly, so it shall be replaced with a new one.
Case 12: Flush air conditioner leaked water
Unit Model: ALCa-H41A5
Phenomena：Indoor unit leaked and running indicator blinked
Cause analysis: water spilled over from water collection pan, we checked drainage condition of water
drain pipe, and found drain amount was very small, so we judged that drain pump failed to drain water
properly
Solution: replaced water drainage pump
Experience Conclusion: drainage method of flush air conditioner is different with split units, the later
can discharge water without any other equipment, but the former shall have discharge pump to drain
water. If air conditioner leaks, discharge pump shall be checked first. Blinking of running indicator
also proves that air conditioner is in water drainage protection mode. Of course, leak of flush air
conditioner also can be resulted by non-plainness of water discharge pump. We shall analyze causes
carefully when we repair air conditioner.
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