Daikin Perfera RXM R Series Service Manual page 208

4 | Third party components
To check for non-condensables in the refrigerant circuit
To perform a pressure test of the refrigerant circuit
Service manual
208
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.
(Degree of refrigerant shortage)
Proper amount
Is the refrigerant circuit charged
correctly?
Yes
No
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
1 Wait for the refrigerant to reach the outdoor temperature.
2 Connect a manometer to the service port.
3 Measure the pressure of the refrigerant. The measured pressure converted
into saturated temperature MUST be in line with the expected pressure /
saturated temperature at current ambient temperature.
4 If the measured pressure is significantly higher (>5K), non‑condensables
gasses are most likely present in the refrigerant.
Any non‑condensables found in the
refrigerant circuit?
Yes
No
1 Perform a pressure test in line with local legislation.
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.
Action
Return to the troubleshooting of the
specific error and continue with the
next procedure.
Add or recuperate refrigerant until
correctly charged, see
procedures" [
Action
To replace the refrigerant, see
procedures" [
Return to the troubleshooting of the
specific error and continue with the
next procedure.
RXM20~71R + ARXM25~71R + FTXM20~71R + ATXM25~50R +
Higher degree
of shortage
"Repair
4
209].
"Repair
4
209].
Split New Perfera R32
ESIE20-11 – 2021.01
FVXM25~50A