Daikin Perfera RXM50R - Page 208

4 | Third party components
Service manual
208
RXM20~71R + ARXM25~71R + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11 – 2021.01
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 "Repair
procedures"[4209].
To check for non-condensables in the refrigerant circuit
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?
Action
Yes To replace the refrigerant, see "Repair
procedures"[4209].
No Return to the troubleshooting of the
specific error and continue with the
next procedure.
To perform a pressure test of the refrigerant circuit
1 Perform a pressure test in line with local legislation.