Daikin R71FUV1 Service Manual page 483

Si20-701_B
Cooling
High
pressure
Low
pressure
Compressor
frequency
Electronic
expansion
valve
Suction
Suction superheated degree is approx. 0 deg.
superheated
degree
Discharge
superheated
degree
Adequate level
Heating
High
pressure
Low
pressure
Compressor
frequency
Compressor frequency
decreases in order to
maintain high pressure.
Electronic
expansion
valve
Suction
Suction superheated degree is approx. 0 deg.
superheated
degree
Discharge
superheated
degree
Adequate
level
476
Maximum frequency
Compressor frequency
increases in order to
maintain low pressure.
(Degree of excessive refrigerant charging)
As compressor
frequency decreases,
low pressure rises.
(Degree of excessive refrigerant charging)
Troubleshooting by Remote Controller
As compressor
frequency decreases,
low pressure rises.
Compressor frequency
decreases due to high
pressure protection control
Electronic expansion valve
opening degree decreases
due to wet protection control
Minimum frequency
Electronic expansion valve
opening degree decreases
due to wet protection control
Minimum opening degree
Excessive charge
Minimum frequency
Minimum opening degree
Excessive charge