Daikin FTXA20A Service Manual page 58

2 | Components
To perform an operation check of the expansion valve
Service manual
58
INFORMATION
Below is an example of the resistance measurements in which the common wire is
connected to pin 6 of the expansion valve coil connector. Connections may differ
according to the type of expansion valve.
▪ Connector pin 1‑6,
▪ Connector pin 2‑6,
▪ Connector pin 3‑6,
▪ Connector pin 4‑6.
a
a Connector
3 Check the insulation resistance of the coil by measuring the resistance
between the pins of each phase (1, 2, 3, 4) and GND on the unit.
Result: None of the measurements should be short‑circuit.
WARNING
When reconnecting a connector to the PCB, make sure to connect it on the correct
location and do NOT apply force, as this may damage the connector or connector
pins of the PCB.
Is the measured resistance correct?
Yes
No
Prerequisite: First perform an electrical check of the expansion valve, see
"2.3.1 Checking procedures" [
1 Turn ON the power of the unit.
INFORMATION
When power is switched ON, PCB checks all expansion valve coil windings by current
check. If winding is short or open, expansion valve error is triggered.
2 Start the unit operation via the user interface.
3 With the unit operating, connect the service monitoring tool to the unit.
Action
Perform an operation check of the
expansion valve, see
procedures" [
Replace the expansion valve coil,
"2.3.2 Repair
4
57].
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
"2.3.1 Checking
4
57].
4
procedures" [ 60].
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05