Abnormal Low Pressure - Daikin Perfera ARXM25A Service Manual

Check item
Check for refrigerant overcharge.
Check for impurities in the refrigerant
pipes.
Check item
Does the indoor unit fan run normally?
Check if the air filter/heat exchanger is
clogged.
Is the indoor unit installed under such
conditions that short circuit easily occurs?
Is there clogging before or after the
expansion valve (capillary)?
Is the High Presure Switch normal?
Is the minimum piping length respected?
Check for refrigerant overcharge.
Check for impurities in the refrigerant
pipes.

3.6.6 Abnormal low pressure

RXM20~50A + ARXM25~50A + FTXM20~50A + ATXM20~50A + CTXM15A
Split Perfera ZETA R32
ESIE23-06 – 2023.12
Detail
Check both heat exchanger temperatures.
If evaporator and condenser temperatures
are too high, there might be overcharge.
Loud squealing might be heard due to the
excess pressure in the pipes.
Usually happens on the new installations.
Not good vacuuming, there are nitrogen,
air and other contaminants.
In heating mode
Detail
Visual inspection
Check if the air filter/heat exchanger is
clean by visual inspection.
If the difference between room air
temperature and the indoor heat
exchanger temperature is more than 20°C
and indoor fan frequency is more than
1000 rpm, the filter/heat exchanger is
possibly clogged.
Visual inspection
▪ 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
Check both heat exchanger temperatures.
If evaporator and condenser temperatures
are too high, there might be overcharge.
Loud squealing might be heard due to the
excess pressure in the pipes.
Usually happens on the new installations.
Not good vacuuming, there are nitrogen,
air and other contaminants.
Abnormally low pressure level is mostly caused by the evaporator side. The
following contents are provided based on field checking of service engineer.
Further, the number is listed in the order of degree of influence.
and after expansion
3 | Troubleshooting
Possible to be checked
by DCS Residential
Yes
See details on the left
No
No
Possible to be checked
by DCS Residential
No
No
Yes
See details on the left.
No
No
valve
No
No
Yes
See details on the left.
No
No
Service manual
draft – 21/12/2023 13:09
45