4 | Third party components
Service manual
205
RXM20~71R + ARXM25~71R + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11 – 2021.01
a Liquid stop valve
b Gas stop valve
2 Check if the stop valves are completely open.
The refrigerant circuit stop valves are
open?
Action
Yes Return to the troubleshooting of the
specific error and continue with the
next procedure.
No Open the stop valves of the refrigerant
circuit, see "Repair procedures"[4209].
To check if the refrigerant circuit is clogged
Prerequisite: Visually check if the refrigerant liquid/gas pipes between the indoor
and outdoor unit are NOT squeezed or bended into too short radius.
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
1 Wait for the refrigerant to reach the outdoor temperature.
2 Connect a manometer to the service port.
3 Turn ON the power of the unit.
4 Activate Heating operation via the user interface.
5 Read the pressure on the pressure gauge. If, at the start of the unit operation,
the pressure is high or very low, the refrigerant circuit might be clogged.
6 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
▪ …
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