Daikin FXSQ32P7VEB [318/370] Check for overcharge of refrigerant in case of vrv systems the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control as information for making a judgement refer to the information below
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Daikin FXSQ32P7VEB [318/370] Check for overcharge of refrigerant in case of vrv systems the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control as information for making a judgement refer to the information below

Daikin FXSQ80PVE [318/370] Check for overcharge of refrigerant in case of vrv systems the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control as information for making a judgement refer to the information below
Troubleshooting by Indication on the Remote Controller SiBE311209
309 Service Diagnosis
Check for Overcharge of Refrigerant.
In case of VRV Systems, the only way to judge as the overcharge of refrigerant is with operating
conditions due to the relationship to pressure control and electronic expansion valve control.
As information for making a judgement, refer to the information below.
Diagnosis of overcharge of refrigerant
1. High pressure rises. Consequently, overload control is conducted to cause insufficient
cooling capacity.
2. The superheated degree of suction gas lowers (or the wet operation is performed).
Consequently, the compressor becomes lower in discharge pipe temperature despite of
pressure loads.
3. The subcooling degree of condensate rises. Consequently, in heating, the temperature of
discharge air through the subcooling section becomes lower.
CHECK 6
Cooling
High pressure
Low pressure
Frequency
High pressure
gradually rises with
increase in
frequency.
Subcooling degree
becomes higher.
(Liquid connection
pipe temperature
lowers.)
Low pressure
rises due
to decreased
compressor output.
High pressure
Low pressure
Frequency
Heating
The outdoor unit electronic expansion valve
is closed due to the overload control.
Frequency comes to
the minimum level.
(High pressure is maintained
at a constant level.)
Low pressure
rises
due to
decreased
frequency.
To maintain high pressure,
frequency decreases under the
capacity control.
High pressure drops or rises
immediately after the overload
control is complete.
Low pressure drops due to
closed outdoor unit
electronic expansion valve.
Hot gas bypass is activated
for low pressure protection,
i.e., hunting at low pressure.
Higher degree of overcharge
(Degree of overcharge)
Proper amount
To maintain low pressure, frequency
increases under the capacity
control.
Frequency comes to
the minimum level.
High pressure
drooping control
(Low pressure is
maintained at a
constant level.)

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