Daikin Emura RXJ20A5V1B Service Manual page 184

5 | Third party components
To check if the refrigerant circuit is correctly charged
Service manual
184
7 On the refrigerant liquid piping (between the indoor unit heat exchanger and
the outdoor unit heat exchanger (coil)), using a contact thermometer,
measure the temperature before and after every restricting device. If a big
temperature difference is measured (>2.5~4K), an internal pipe obstruction
may be present at this location.
INFORMATION
Focus on positions with a potential risk for clogging such as:
▪
Filters
▪
Valves
▪
Brazing points
▪
...
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 refrigerant in liquid form rises (values >4~5K are
NOT normal).
Action
Replace the clogged part, see
"5.2.2 Repair procedures" [
Return to the troubleshooting of the
specific error and continue with the
next procedure.
RXJ20~50A + FTXJ-A(W)(S)(B)
4
187].
Split Emura 3 R32
ESIE22-04B – 2022.08