Control Specification (15/18/24 Class) SiUS04-904
60 Function and Control
4.13.3 Refrigerant Shortage Control
Outline If a power consumption is below the specified value in which the frequency is higher than the
specified frequency, it must be regarded as refrigerant shortage.
In addition to such conventional function, if the discharge pipe temperature is higher than the target
discharge pipe temperature, and the electronic expansion valve is fully open (450 pulses) more
than the specified time, it is considered as refrigerant shortage.
With the conventional function, a power consumption is low comparing with that in the normal
operation when refrigerant is insufficient, and refrigerant shortage is detected by checking a power
consumption.
When operating with refrigerant shortage, although the rise of discharge pipe temperature is great
and the electronic expansion valve is open, it is presumed as refrigerant shortage if the discharge
pipe temperature is higher than the target discharge pipe temperature.
Refer to “Refrigerant Shortage” on page 138 for detail.
Detail Judgment by Input Current
When an output frequency is exceeds 55 Hz and the input current is less than specified value, the
adjustment is made for refrigerant shortage.
Judgment by Discharge Pipe Temperature
When discharge pipe temperature is 36°F higher than target value and the electronic expansion
value opening is 450 plus (max.), the adjustment is made for refrigerant shortage.
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