SiEN34-705
Appendix
General Information
207
7.14.16 Cooling Operation of Specific Indoor Units is not Good.
Applicable
Models
VRV in general
Condition
Cooling operation of specific indoor units only is not good though remaining indoor units work
well and reach the set temperature.
The pressure of the outdoor units for low-pressure use (evaporating temperature) has reached
the target value.
Liquid pipe temperature of the faulty indoor units is 4 to 5°C and gas pipe temperature is 18 to
22°C.
Cause
Liquid pipe at the inlet of indoor unit was bent by hands and broken. It caused lacking in gas
supply because essential refrigerant circulation amount was not secured for the indoor units.
Measure
Recovers by correcting the field piping.
Point of
Diagnosis
1. Check the following:
Make sure that the difference between thermistor temperature of indoor unit’s gas pipe and
thermistor temperature of liquid pipe is approx. 5°C.
(Thermistor temperature of indoor unit's liquid pipe: 5 to 8°C; Thermistor temperature of gas
pipe: 10 to 13°C)
2. Check whether the pressure of outdoor unit for low-pressure (evaporating temperature) is
approx. 0.4 MPa.
