Daikin Sensira Series - Page 39

2 | Components
Service manual
39
FTXF20~71A + FTXF20~25B + FTXF20~42C + ATXF20~71A + ATXF20~42C
+ RXF20~71A + RXF20~60B + RXF20~42C + ARXF20~71A + ARXF20~42C
Split Sensira R32
ESIE18-12E – 2021.02
12 With the 4‑way valve connector connected to the PCB, measure the voltage
on the 4‑way valve connection of the PCB.
Result: The measured voltage MUST be:
Class Voltage
Class 20~42 12VDC when operating in Heating
mode
0VDC when operating in Cooling
mode
Class 50~71 220~240VAC when operating in
Heating mode
0VAC when operating in Cooling
mode
Is the measured voltage correct? Action
Yes Perform a position check of the 4-way
valve, see "2.1.1Checking
procedures"[437].
No Perform a check the main PCB, see
"2.8Main PCB"[474].
To perform a position check of the 4-way valve
1 First perform an electrical check of the 4‑way valve, see "2.1.1 Checking
procedures"[437].
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
"5.3Piping diagram"[4151]).
Is the flow correct? Action
Yes Skip the next step of this procedure.
No Perform the next step of this procedure.
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.