Service Manual 161
Operation detail
(2) Control to prevent low pressure
1. If the measured pressure(transformed absolute pressure)from low-pressure sensor satisfies the condi-
tion, take 1 minute periodic control like following graph.
■ Oil Return Operation
(1) Conditions for oil return operation
1. Compressor on time (normal operation not full capacity operation) is 6 hours or more.
2. During operation, deicing operation is started or the load is changed to full capacity operation, the
cumulative time is reset
(2) Process of oil return operation
1. Change the ICOF Step to 16.
2. In heating operation, oil return operation is performed in cooling mode by turning reversing valve off.
3. The method of handling reversing valve is the same that of same deicing operation
(3) Finishing oil return operation
1. After oil return operation carried out for 3 minutes, return to normal operation
■ Safety Control
(1) Control to prevent high pressure
1. If the measured pressure(transformed absolute pressure)from high-pressure sensor satisfies the condi-
tion, take 1 minute periodic control like following graph.
(2) Control to prevent low pressure
1. If the measured pressure(transformed absolute pressure)from low-pressure sensor satisfies the condi-
tion, take 1 minute periodic control like following graph.
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