Troubleshooting by Remote Controller
Si20-701_B
479
Refrigerant shortage warning
As compressor frequency
decreases, high pressure
decreases.
(Maintains a certain level
of low pressure)
Abnormal refrigerant shortage
Controlled high pressure
Actual high pressure
When frequency drops to the
lowest, it is impossible to
maintain a low pressure.
As the electronic expansion valve
opening degree reaches the maximum,
suction superheated degree increases.
Reaches the lowest frequency
Inadequate
In response to decreased evaporator capacity
caused by refrigerant shortage, capacity is controlled
in the inverter in order to maintain a low pressure,
which resulting in a decrease in frequency.
Avoid overheat operation by
changing SC target value
(Degree of inadequate refrigerant)
Cooling
High pressure
Low pressure
Suction
superheat
degree
Compressor
frequency
Electronic
expansion
valve
Adequate
level
The maximum opening degree of the
electronic expansion valve (480 pulses)