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SiBE12-816_D
Control Specification
Function and Control
96
4.12.3 Refrigerant Shortage Control
Outline
I Detecting by power consumption
If the power consumption is below the specified value and the frequency is higher than the
specified frequency, it is regarded as refrigerant shortage.
The power consumption is small comparing with that in the normal operation when refrigerant is
insufficient, and refrigerant shortage is detected by checking a power consumption.
II Detecting by discharge pipe temperature
If the discharge pipe temperature is higher than the target discharge pipe temperature, and the
electronic expansion valve is fully open for more than the specified time, it is regarded as
refrigerant shortage.
Refer to page 254 for detail.
Frequency
Power consumption
Refrigerant shortage zone
48 Hz
(R12507)
(R1391)
Refrigerant shortage
zone
Target discharge
pipe temperature