Nature of fault Symptom
-Electric current during operation becomes approximately 20% lower than the normal
Insufficient compressing of a
compressor
-The discharge tube of the compressor becomes abnormally hot (normally 70 to 90°C).
-The difference between high pressure and low pressure becomes almost zero.
-Electric current reaches a high level abnormally, and the value exceeds the limit of an
some cases, a breaker turns off.
Locked compressor
-The compressor is a humming sound.
-Electric current during operation becomes approximately 80% lower than the normal
Insufficient switches of the 4-
way valve
-The temperature different between from the discharge tube to the 4-way valve and from
to the 4-way valve becomes almost zero.
14. Technical Data
74
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