15.1.1Relationship between the condition of the air conditioner and pressure and electric current
Condition of the |
| Cooling Mode |
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air conditioner | Low Pressure | High Pressure | Electric current during operation | |
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Insufficient refrigerant | Ô | Ô | Ô | |
(gas leakage) | ||||
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Clogged capillary tube or | Ô | Ô | Ô | |
strainer | ||||
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Short circuit in the indoor unit | Ô | Ô | Ô | |
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Heat radiation deficiency | Ò | Ò | Ò | |
of the outdoor unit | ||||
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Inefficient compression | Ò | Ô | Ô | |
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• Carry out the measurement of pressure, electric current, and temperature fifteen minutes after an operation is started.
15.1.2Diagnosis methods of a malfunction of a compressor
Nature of fault
Insufficient compressing of a compressor
Locked compressor
Symptom
•Electric current during operation becomes approximately 20% lower than the normal value.
•The discharge tube of the compressor becomes abnormally hot (normally 70°C to 90°C).
•The different between high pressure and low pressure becomes almost zero.
•Electric current reaches a high level abnormally, and the value exceeds the limit of an ammeter. In some cases, a breaker turns off.
•The compressor has a humming sound.
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