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Third party components
Service manual
208
RXM20~71R(9) + ARXM25~71R(9) + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11B – 2022.02
a
b
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
To check if the refrigerant circuit is clogged
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
Check that all field piping is done according to the refrigeration practice and
installer reference guide:
▪
Correct piping diameters
▪
Piping distance limits are followed
▪
NO pipes are squeezed
▪
NO short radius bends
3
Connect a manometer to the service port.
4
Turn ON the power of the unit.
5
Activate
Heating
operation via the user interface.
6
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.
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.
