Daikin FTXG25CVMAW, Руководство по обслуживанию

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Si04-402A Troubleshooting
Service Diagnosis 101
4.23 Insufficient Gas
Remote
Controller
Display
U0
Method of
Malfunction
Detection Gas shortage detection I : A gas shortage is detected by checking the compressor running
frequency.
Gas shortage detection II : A gas shortage is detected by checking the difference between
indoor unit heat exchanger temperature and room temperature as well as the difference
between outdoor unit heat exchanger temperature and room temperature.
Gas shortage detection III : A gas shortage is detected by checking the difference between
inhale and exhale temperature.
Malfunction
Decision
Conditions Gas shortage detection I :
Input current <
(A/Hz) x Compressor running frequency × V
However, when the status of running frequency > (Hz) is kept on for a certain time.
Note : The values are different from model to model.
Gas shortage detection II :
If a gas shortage error takes place 4 times successively, the system will be shut down. The error
counter will reset itself if this or any other error does not occur during the following 60-minute
compressor running time (total time).
Gas shortage detection III :
When the difference of the temperature is smaller than
, it is regarded as insufficient gas.
Supposed
Causes
„
Refrigerant shortage (refrigerant leakage)
„
Poor compression performance of compressor
„
Discharge pipe thermistor disconnected, or indoor unit or outdoor unit heat exchanger
thermistor disconnected, room or outdoor air temperature thermistor disconnected
„
Stop valve closed
„
Electronic expansion valve defective
640 / 256 0 55
Cooling
room temperature
−
indoor heat exchanger temperature 4.0°C
outdoor heat exchanger temperature
−
outdoor temperature 4.0°C
Heating
indoor heat exchanger temperature
−
room temperature 4.0°C
outdoor temperature
−
outdoor heat exchanger temperature 3.0°C