Daikin FTXP20-71L Service Manual page 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
The opening degree of the electronic
expansion valve comes larger.
High
pressure
(Low pressure is
Low
maintained at a
pressure
certain level.)
Low pressure rises with increasing
opening degree of the electronic
expansion valve, and the operating
frequency slightly increases due to the
capacity control.
Operating
frequency
To maintain low pressure, operating
frequency decreases on the capacity control.
Proper amount
Heating
The opening degree of the electronic expansion valve becomes larger.
The electronic expansion valve fully opens and frequency increases.
High
pressure
Low
pressure
Frequency
To maintain low pressure, frequency
initially increases due to the capacity
control.
Proper amount
Is the refrigerant circuit charged
correctly?
Yes
No
Electronic expansion valve
fully opens.
Operating frequency comes
to the lowest level.
High pressure decreases
due to compressor
capacity decreasing.
Even with compressor
operating at lowest level,
low pressure drops
(refrigerant shortage).
(Degree of shortage)
Higher degree of
shortage
Discharge pipe or low pressure drooping control.
Frequency comes to
the minimum level.
(High pressure is
maintained at a
constant level.)
Frequency drops
due to the low pressure
drooping control.
(Degree of refrigerant shortage)
Action
Return to the troubleshooting of the
specific error and continue with the
next procedure.
Add or recuperate refrigerant until
correctly charged, see
procedures" [
4 Third party components
|
Fan control, i.e.,
actually hunting to
maintain high pressure
on the cooling control
with low outdoor air.
Higher degree
of shortage
"4.2.2 Repair
4
148].
Service manual
147