Daikin Perfera RXM R Series Service Manual page 205

To check if the refrigerant circuit is clogged
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?
Yes
No
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
▪
...
4 Third party components
|
a
b
Action
Return to the troubleshooting of the
specific error and continue with the
next procedure.
Open the stop valves of the refrigerant
circuit, see "Repair
4
procedures" [ 209].
Service manual
205