Abnormal High Pressure - Daikin Perfera ARXM25A Service Manual

3 | Troubleshooting
Check
Check for refrigerant shortage
Check the expansion valve.
Check for the impurities in the refrigerant
pipes.

3.6.5 Abnormal high pressure

Check item
Does the outdoor unit fan run normally?
Is the outdoor unit heat exchanger
clogged?
Is there clogging before or after the
expansion valve (capillary)?
Is the High Pressure Switch normal?
Is the outdoor unit installed under such
conditions that short circuit easily occurs?
Is the piping length ≤5 m?
Service manual
44
draft – 21/12/2023 13:09
Detail
Diagnosis by service port pressure and
operating current .
▪ Is the unit filled with the specified
refrigerant volume?
▪ Is there a flushing noise due to
refrigerant shortage?
If the difference between room air and
indoor heat exchanger temperature is less
than 4K, there is a possibility of refrigerant
shortage.
If the difference between compressor
discharge temperature and condenser
temperature is too much (range 30~50K),
there is a possibility of refrigerant shortage.
If a passing sound is heard from the
pressure reducing valve, apply sound
insulation sheets of putty to reduce the
valve noise.
Usually happens on the new installations.
Not good vacuuming, there are nitrogen,
air and other contaminants.
In cooling mode
Detail
Visual inspection
Check if the outdoor unit heat exchanger is
clean by visual inspection.
If the difference between outdoor ambient
temperature and the outdoor unit heat
exchanger temperature is more than 20°C
and outdoor fan is working, the outdoor
unit heat exchanger is possibly clogged.
▪ Check if there is a temperature difference
before
(capillary).
▪ Check if the main valve unit of expansion
valve operates (by noise, vibration).
Check continuity by using a tester.
Visual inspection
Visual inspection
and after expansion
RXM20~50A + ARXM25~50A + FTXM20~50A + ATXM20~50A + CTXM15A
Possible to be checked
by DCS Residential
No
Yes
See details on the left.
No
No
Possible to be checked
by DCS Residential
No
No
Yes
See details on the left
No
valve
No
No
No
Split Perfera ZETA R32
ESIE23-06 – 2023.12