Daikin Emura 3 Series, Руководство по обслуживанию, Страница: 65 / 100

5 | Third party components
Service manual
65
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04 – 2022.04
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).
Cooling
Proper amount
Higher degree of
shortage
(Degree of shortage)
To maintain low pressure, operating
frequency decreases on the capacity control.
(Low pressure is
maintained at a
certain level.)
Operating
frequency
Low
pressure
High
pressure
Even with compressor
operating at lowest level,
low pressure drops
(refrigerant shortage).
Electronic expansion valve
fully opens.
The opening degree of the electronic
expansion valve comes larger.
Fan control, i.e.,
actually hunting to
maintain high pressure
on the cooling control
with low outdoor air.
Low pressure rises with increasing
opening degree of the electronic
expansion valve, and the operating
frequency slightly increases due to the
capacity control.
High pressure decreases
due to compressor
capacity decreasing.
Operating frequency comes
to the lowest level.
draft – 22/04/2022 08:50