Troubleshooting by Remote Controller
Si20-701_B
481
(Maintains a certain
level of high pressure)
High pressure
Low pressure
Suction
superheated
degree
Compressor
frequency
Electronic
expansion
valve
Adequate
level
Indoor heat exchanger temperature (Th2)
Suction air temperature (Th1)
Electronic expansion valve control by avoiding superheat operation
In response to decreased evaporator capacity
caused by refrigerant shortage, capacity is
controlled in the inverter in order to maintain high
pressure, which resulting in a rise in frequency.
Drooping control by suction superheat degree
(Prevention of oil to heat exchanger from
being retained)
Suction superheated degree increases.
A decrease in evaporator capacity frequently
puts the system in defrost operation.
When frequency drops to the
lowest, a decrease in low
pressure becomes larger.
Inadequate
(Degree of inadequate refrigerant)
Refrigerant shortage warning
As compressor frequency
decreases, high pressure
decreases.
Abnormal refrigerant shortage
Reaches the lowest frequency
The maximum opening degree of the
electronic expansion valve (480 pulses)
Heating