Si30-408 Points of Analysis
Service Checker Type3 Application Edition 189
(Case Example) Ve-up STD RSXYP 5-10L:Malfunction of heating (Indoor units are all in fan operation
mode.)
Features of data
The system is under heating overload (high pressure stepping down) control.
The condensing temperature (high pressure) has reached the target value.
The operating frequency of INV compressor does not increase.
(STD compressor stops running.)
The opening degree of outdoor unit EV is small.
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Diagnosis
The compressor is low in capacity but reaches the target value of Tc and also under heating
overload control. Consequently, the compressor load does not increase even if an increase of
the capacity is demanded by the indoor unit.
Cause
Non-condensable gas may have mixed in the refrigerant system.
Countermeasure
The system returned to good running conditions by the replacement of refrigerant.(Abnormal
rise in high pressure occurred on the recovery unit while in refrigerant recovery operation. ←
Non-condensable gas)
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