Daikin FTXP20-71L, Руководство по обслуживанию

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4 | Third party components
Service manual
147
ATXP20~35 + FTXP20~71 + ARXP20~35 + RXP20~71
Split Comfora R32
ESIE18-01E – 2023.01
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.
Heating
Frequency
Low
pressure
High
pressure
Proper amount
Higher degree
of shortage
(Degree of refrigerant shortage)
To maintain low pressure, frequency
initially increases due to the capacity
control.
Frequency drops
due to the low pressure
drooping control.
(High pressure is
maintained at a
constant level.)
Frequency comes to
the minimum level.
Discharge pipe or low pressure drooping control.
The electronic expansion valve fully opens and frequency increases.
The opening degree of the electronic expansion valve becomes larger.
Is the refrigerant circuit charged
correctly? Action
Yes Return to the troubleshooting of the
specific error and continue with the
next procedure.
No Add or recuperate refrigerant until
correctly charged, see
"4.2.2 Repair
procedures" [
4
148].