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Third party components
Service manual
209
RXM20~71R(9) + ARXM25~71R(9) + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11B – 2022.02
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?
Action
Yes
Replace the clogged part, see
No
Return to the troubleshooting of the
specific error and continue with the
next procedure.
To check if the refrigerant circuit is correctly charged
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).
Cooling
Proper amount
Further overcharge
(Degree of overcharge)
To maintain low pressure, operating
frequency increases on the capacity control.
(Low pressure is maintained
at a certain level.)
High pressure drooping control
Operating frequency comes to
the lowest level.
Subcooling degree becomes
higher. (The temperature of
liquid connection piping
becomes lower.)
High pressure gradually rises with
increasing operating frequency.
Low pressure rises with lowering
compressor output.
Operating
frequency
Low
pressure
High
pressure
