Daikin ARXS25L2V1B, Руководство по обслуживанию

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Troubleshooting SiBE041134EB
66 Service Diagnosis
4.6 Refrigerant Shortage
Error Code
U0
Method of Error
Detection Detecting by discharge pipe temperature
Refrigerant shortage is detected by checking the discharge pipe temperature and the opening of
the electronic expansion valve. If the refrigerant is short, the discharge pipe temperature tends
to rise.
Detecting by the difference in temperature
Refrigerant shortage is detected by checking the difference between suction and discharge
temperature.
Error Decision
Conditions Detecting by discharge pipe temperature
The following conditions continue for 80 seconds.
Š
Opening of the electronic expansion valve
≥
D
Š
Discharge pipe temperature > E × target discharge pipe tempe F
Detecting by the difference in temperature
When the difference of the temperature is smaller than G °C, it is regarded as refrigerant
shortage.
„
If the error repeats, the system is shut down.
„
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
„
Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
room or outdoor temperature thermistor
„
Closed stop valve
„
Refrigerant shortage (refrigerant leakage)
„
Poor compression performance of compressor
„
Defective electronic expansion valve
D (pulse) E (–) F (°C)
480 128/128 30
Operation
mode Description G (°C)
Cooling
room thermistor temperature – indoor heat exchanger temperature 4.0
outdoor heat exchanger temperature – outdoor temperature 4.0
Heating
indoor heat exchanger temperature – room thermistor temperature 3.0
outdoor temperature – outdoor heat exchanger temperature 3.0