SiENBE04-512A Troubleshooting
Service Diagnosis 127
4.20 Insufficient Gas
Remote Control
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 :
DC current × DC voltage < (A/Hz) × Compressor running frequency +
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
ARK(X)S models 640 / 256 0 55
(A)RK(X)H, R(Y)N models 640 / 256 50 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
SiENBE04-512A.book Page 127 Friday, October 5, 2007 1:49 PM
To Next Page
Loading...
