Daikin Sky Air Advance RZA200D7Y1B, Service Manual

Page: 46 / 192

2 | Troubleshooting
Service manual
46
250D7Y1B
Sky Air Advance-series
ESIE19-13A – 2020.05
Check item Detail
Is the refrigerant overcharged? Conduct refrigerant collection and
vacuum drying, and then add proper
amount refrigerant.
2.5.6 Abnormal low pressure
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.
In cooling mode
Check item Detail
Does the indoor unit fan run normally? Visual inspection
Is the indoor unit heat exchanger
clogged? Visual inspection
Is the indoor unit installed under such
conditions that short circuit easily
occurs? Visual inspection
Is there clogging before or after the
expansion valve (capillary)? ▪ 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).
Is the check valve (if applicable)
clogged? Check if there is a temperature
difference before and after check valve.
If YES, the check valve is clogged.
Is there a shortage of refrigerant? Conduct refrigerant collection and
vacuum drying, and then add proper
amount refrigerant.
In heating mode
Check item Detail
Does the outdoor unit fan run
normally? Visual inspection
Is the outdoor unit heat exchanger
clogged? Visual inspection
Is there clogging before or after the
expansion valve (capillary)? ▪ 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).
Is the check valve (if applicable)
clogged? Check if there is a temperature
difference before and after check valve.
If YES, the check valve is clogged.