Daikin Perfera RXM R Series Service Manual page 43

To perform a position check of the 4-way valve
RXM20~71R + ARXM25~71R + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11 – 2021.01
Class
Class 20~35
Class 42~71
Is the measured voltage correct?
Yes
No
1 First perform an electrical check of the 4‑way valve, see
4
procedures" [ 41].
When outdoor temperature is mild and unit can switch between heating and
cooling
INFORMATION
This procedure is ONLY possible when the outdoor temperature is within the
temperature range for both Heating and Cooling operation mode. See the
databook on Business Portal for the temperature range of the operation modes.
2 Activate Heating operation via the user interface.
INFORMATION
It is recommended to connect the service monitoring tool to the unit and verify the
operation mode of the 4-way valve.
3 Check with a contact thermometer (or by touching) if the flow through the 4-
way valve corresponds with the flow shown in the flow diagram. (See
"6.3 Piping diagram" [
Is the flow correct?
Yes
No
4 Connect a manifold to one of the service ports of the refrigerant circuit and
check the pressure (suction, discharge). Compare with normal operation
conditions of the unit.
Refrigerant pressure correct?
Yes
Voltage
12 V DC when operating in Heating
mode
0 V DC when operating in Cooling
mode
220~240 V AC when operating in
Heating mode
0 V AC when operating in Cooling
mode
Action
Perform a position check of the 4-way
valve, see
Perform a check the main PCB, see
"3.12 Main
4
234]).
Action
Skip the next step of this procedure.
Perform the next step of this procedure.
Action
Replace the body of the 4‑way valve,
see "Repair
3 Components
|
"Checking procedures" [
4
PCB" [ 123].
"Checking
4
procedures" [ 45].
Service manual
4
41].
43