Daikin Sky Air Advance RZA200D7Y1B, Service Manual

Page: 140 / 192

4 | Third party components
Service manual
140
250D7Y1B
Sky Air Advance-series
ESIE19-13A – 2020.05
Cooling
Proper amount Further overcharge
(Degree of overcharge)
To maintain low pressure, operating
frequency increases on the capacity control.
(Low pressure is maintained
at a certain level.)
High pressure drooping control
Operating frequency comes to
the lowest level.
Subcooling degree becomes
higher. (The temperature of
liquid connection piping
becomes lower.)
High pressure gradually rises with
increasing operating frequency.
Low pressure rises with lowering
compressor output.
Operating
frequency
Low
pressure
High
pressure
Heating
Proper amount Higher degree of
overcharge
(Degree of overcharge)
To maintain high pressure, frequency
decreases under the capacity control.
Low pressure drops due to
closed outdoor unit
electronic expansion valve.
High pressure drops or rises
immediately after the
overload control is complete.
Low pressure rises
due to decreased
frequency.
Frequency comes to
the minimum level.
The electronic expansion valve
is closed due to the overload control.
Frequency
Low
pressure
High
pressure
(High pressure is
maintained at a
constant level.)
Refrigerant shortage diagnosis
1 The superheated degree of suction gas rises. Consequently, the compressor
discharge gas temperature becomes higher than normal.
2 The superheated degree of suction gas rises. Consequently, the electronic
expansion valve turns open more than normal or completely open for average
output.
3 Low pressure drops to cause the unit not to reach cooling capacity (or heating
capacity).