Daikin Sensira Series, Service Manual

Page: 37 / 172

2 | Components
Service manual
37
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
2 Components
CAUTION
When replacing a component ALWAYS make sure the correct spare part for your unit
is installed.
2.1 4-way valve
2.1.1 Checking procedures
INFORMATION
It is recommended to perform the checks in the listed order.
To perform a mechanical check of the 4-way valve
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
1 Remove the required plate work, see "2.10 Plate work" [
4
101].
DANGER: RISK OF BURNING/SCALDING
The coil gets hot while energized. Wait for it to cool down.
2 Verify that the screw is firmly fixing the coil to the valve body.
3 Check if any damage or burst is present.
Is the 4‑way valve coil firmly fixed and
not visually damaged? Action
Yes Perform an electrical check of the 4‑way
valve, see
"2.1.1 Checking
procedures" [
4
37].
No Fix or replace the 4‑way valve coil, see
"2.1.2 Repair procedures" [
4
41].
To perform an electrical check of the 4-way valve
Prerequisite: First perform a mechanical check of the 4-way valve, see
"2.1.1 Checking procedures" [
4
37].
1 Unplug the 4-way valve connector from the appropriate PCB.
2 Measure the resistance of the 4-way valve coil between the pins of the 4-way
valve connector.
Result: The measured value must be:
Class Resistance
Class 20~42 560 Ω ± 5%
Class 50~71 1787 Ω ± 10%
Is the measured value correct? Action
Yes Continue with the next step.