Daikin Sky Air Advance RZA200D7Y1B Service Manual page 139

To check if the refrigerant circuit is correctly charged
RZA200+250D7Y1B
Sky Air Advance-series
ESIE19-13A – 2020.05
INFORMATION
A bigger temperature drop before and after the expansion valve can be normal,
however excessive ice is indicating a malfunction of the expansion valve or internal
obstruction of the valve (dirt or ice build up in case of humidity in the system).
Temperature drop found?
Yes
No
Due to the relationship to pressure control and electronic expansion valve control,
the amount of refrigerant needs to be examined according to operating conditions.
Refer to the procedures shown below for correct examination.
Refrigerant overcharge diagnosis
1 High pressure rises. Consequently, overload control is conducted to cause
insufficient cooling capacity.
2 The superheated degree of suction gas lowers (or the wet operation is
performed). Consequently, the compressor consumes more power and is
noisy (before over‑current relay trips).
3 The subcooling degree of refriferant in liquid form rises (values >4~5K are NOT
normal).
4 Third party components
|
Action
Replace the clogged part, see
"4.2.2 Repair procedures" [
Return to the troubleshooting of the
specific error and continue with the
next procedure.
4
142].
Service manual
139