3 | Third party components
Service manual
135
(C)(F)TXA15~50A(W)(S)(T) + (C)(F)TXA15~50B(B)(S)(T) + RXA42+50A +
RXA20~35A + RXA42+50B
Split Stylish R32
ESIE18-03C – 2020.02
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
p
ressure
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.
Hot gas bypass is activated
for low pressure protection,
i.e., hunting at low pressure.
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
4 The superheated degree of suction gas rises. Consequently, the compressor
discharge gas temperature becomes higher.
5 The superheated degree of suction gas rises. Consequently, the electronic
expansion valve turns open.
6 Low pressure drops to cause the unit not to demonstrate cooling capacity (or
heating capacity).
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