Si30-408 Method of Troubleshooting
Troubleshooting 73
3.1.1 Change of High / Low Pressure and Frequency with Excessive /
Insufficient Refrigerant Gas Charge (Presentation with Image)
[For operation with all units connected (100 %)]
1. Excessively Charged Refrigerant Gas
å~áº
Cooling
High pressure
Low pressure
Frequency
High pressure
Low pressure
Frequency
Heating
No status change within the range that the receiver can absorb the refrigerant.
High pressure stepping down control
Frequency becomes to
the minimum.
Subcooled degree increases.
(Temperature drops in liquid connection piping)
(Low pressure is
maintained constant.)
Low pressure rises due to decreasing
of compressor output.
Progress of excessive gas charging
No status change within the range
that the receiver can absorb the refrigerant
Frequency becomes to
the minimum.
Outdoor electronic expansion valve closes due to overload control.
High pressure lowers immediately
after the overload control.
High pressure rises
gradually with increasing
of frequency.
For maintaining of low pressure, capacity control
shall be conducted resulting frequency rising.
(High pressure is maintained
constant.)
Low pressure rises due to
lowering of frequency.
Low pressure lowers due to closing of
outdoor motorized valve.
Hot gas bypass actuates with low
pressure protection = actually, low
pressure hunting will be generated.
For maintaining of high pressure,
capacity control shall be conducted
resulting frequency lowering.
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