3) Overcharge
(1) Symptoms : • The temperature difference of suction-discharge air is 8°C or less, the running current
is higher than the specified current, the pressure of low pressure side is high, and
the compressor and suction pipe are cold.
If running in the condition, pressure switch activates at overload operation to make
continuous operation impossible, compressor is difficult to start, and fuse or breaker is
easy to be disconnected.
(2) Actions : ➀ Dischage the refrigerant. (By 3-5kg/cm
2
G)
➁ Charge refrigerant to the specified level.
➂ Check for gas leak.
4) Bad compression
(1) Symptoms : • The temperature difference of suction-discharge air is little, the running current is less
than the specified current, the pressure of high pressure side is low, and the pressure
of low pressure is high.
(2)
Judgement method
:• Close service valve of high pressure side in condenser (front seat) and connect the
manifold gauge to the service valve of low pressure side.
(Close the valve.)
• If the dial of pressure gauge does not indicate 0kg/cm
2
G or less by cooling in the con-
dition, the compressor is judged as bad.
Note) If pressure gauge is near 0kg/cm
2
G, immediately stop the cooling.
Otherwise, air flows into the refrigerating cycle or the compressor motor coating is taken off to cause the
poor insulation. So, care should be taken.
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