AUX air conditioner service manual
205
conditioner run 5 minutes, and evaporator of indoor unit was frosted, so we presumed that refrigerant
was not sufficient; we checked and found that low pressure was 3KG. Turned off air conditioner,
checked indoor & outdoor units and connection tube and found oil stain on the junction of low
pressure copper tube.
Solution: released refrigerant, twisted off line junction and found a small crack; repaired flare mouth,
checked leakage sources under high pressure, vacuum the system, added refrigerant, and then test run
the air conditioner and it worked properly.
Experience Conclusion: to fix the air conditioner, maintenance personnel shall have flexible thoughts
and broad vision; find out actual problems according to principle of air conditioner.
Case 7: Nut of connection tube is broken.
Unit Model：ASW-H12A4/HSA
Phenomena: Poor cooling efficiency and indoor unit was frozen
Cause Analysis: checked and found that low pressure of outdoor unit was very low, return gas tube
was frosted, but the tube was not bent. Turned on ventilation mode, we found that low pressure was
lower than normal value when ice was melted. We checked leakage sources and found that nut of
connection tube on indoor unit was broken.
Solution: replace nut, vacuum the system and add refrigerant.
Experience Conclusion: analyze the actual condition carefully, generally, analyze fault according to
the frosted position and area. Refrigerant lack will cause frost on liquid tube; upper part of evaporator
will be frozen.
Case 8 Welds of high pressure valve leaked
Unit Model： ASW-H12A4
Phenomena: Poor cooling efficiency and indoor unit leaked water
Cause Analysis: checked air conditioner and found that air conditioner failed to work well and the
cooling efficiency is poor. Evaporator of indoor unit was frosted, so we presumed that system was
lack of refrigerant; we found system pressure was very low. We checked the system and found leakage
source on the connection tube of High pressure valve body. Welded the leakage source and added
refrigerant; turned on air conditioner and it worked well.
Experience Conclusion: air conditioner lacks in refrigerant and is frosted, so indoor unit leaks and the
cooling efficiency is poor. The fundamental problems are weld leakage and lacking in refrigerant
Case 9 Weld leakage of condenser distributor
Unit Model：ASF-41A5
Phenomena: Failed to cool, running indicator and 18# indicator blinked at the same time, air
conditioner couldn’t be turned on.
Cause Analysis: air conditioner was only used for two days, according to client, air conditioner failed
to cool. We checked the air conditioner, voltage was 390v, balanced pressure was 0MPa; according to
phenomena and data, we presumed that the system lacked of refrigerant, the air conditioner was in low
pressure protection situation. Opened outdoor unit, we found oil stain on the weld of distributor of
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