Insufficient Gas - Daikin FTKS20CVMB(9) Service Manual

SiENBE04-512A

4.20 Insufficient Gas

U0
Remote Control
Display
Method of
Gas shortage detection I : A gas shortage is detected by checking the compressor running
Malfunction frequency.
Gas shortage detection II : A gas shortage is detected by checking the difference between
Detection
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
Gas shortage detection I :
DC current × DC voltage <
Decision
However, when the status of running frequency >
Conditions
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
Cooling
Heating
Supposed
Causes
Service Diagnosis
ARK(X)S models
(A)RK(X)H, R(Y)N models
room temperature – indoor heat exchanger temperature
outdoor heat exchanger temperature – outdoor temperature
indoor heat exchanger temperature – room temperature
outdoor temperature – outdoor heat exchanger temperature
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
(A/Hz) × Compressor running frequency +
(Hz) is kept on for a certain time.
640 / 256 0
640 / 256 50
Troubleshooting
55
55
, it is regarded as insufficient gas.
4.0°C
4.0°C
4.0°C
3.0°C
127