Abnormal High Pressure - Daikin RXM20R Service Manual

3 | Troubleshooting

3.6.5 Abnormal high pressure

Service manual
44
In cooling mode
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?
Does air enter the refrigerant system?
Is the refrigerant overcharged?
In heating mode
Check item
Does the indoor unit fan run normally?
Is the indoor unit heat exchanger
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?
Does air enter the refrigerant system?
Detail
Visual inspection
Visual inspection
▪ Check if there is a temperature
difference before and after expansion
valve (capillary).
▪ Check if the main valve unit of
expansion valve operates (by noise,
vibration).
Check continuity by using a tester.
Visual inspection
Visual inspection
Conduct refrigerant collection and
vacuum drying, and then add proper
amount refrigerant.
Conduct refrigerant collection and
vacuum drying, and then add proper
amount refrigerant.
Detail
Visual inspection
Visual inspection
Visual inspection
▪ Check if there is a temperature
difference before and after expansion
valve (capillary).
▪ Check if the main valve unit of
expansion valve operates (by noise,
vibration).
Check continuity by using a tester.
Visual inspection
Conduct refrigerant collection and
vacuum drying, and then add proper
amount refrigerant.
RXM20~71R(9) + ARXM25~71R(9) + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11B – 2022.02