Refrigerant Shortage (Error) - Daikin SkyAir GQI-Eco Series Service Manual

SiBE281013

4.30 Refrigerant Shortage (Error)

U0
Remote
Controller
Display
Applicable RZQG
Models
Method of Error (In cooling)
Detection based on difference in temperature between temperature set by remote controller and
Detection
indoor suction air temperature, electronic expansion valve opening degree, compressor
frequency and low pressure.
(In heating)
Detection based on difference in temperature between temperature set by remote controller and
indoor suction air temperature, electronic expansion valve opening degree during the control of
suction air superheating, high pressure, indoor heat exchanger temperature and indoor suction
air temperature.
Error Decision (In cooling)
Conditions When compressor frequency does not increase even though the load is heavy because the
electronic expansion valve is opened to the fullest extent
(In heating)
When suction gas superheat degree is large, compressor frequency is low and the electronic
expansion valve is opened to the fullest extent even though heating load is heavy
[If high pressure is lower than saturated pressure for indoor heat exchanger temperature (or
indoor suction air temperature), error is confirmed.]
Supposed
Causes
Service Diagnosis
Refrigerant shortage
Clogged refrigerant piping system
Mismatching of wiring and piping
Stop valve is not opened
Troubleshooting by Remote Controller
149