Daikin FTXP20-71L, Service Manual

Page: 64 / 192

3 | Components
Service manual
64
ATXP20~35 + FTXP20~71 + ARXP20~35 + RXP20~71
Split Comfora R32
ESIE18-01E – 2023.01
▪
For oil drops around the expansion valve. Locate and fix as necessary.
▪ Pipes for signs of damage. Replace pipes as needed.
▪
Coil wires for signs of damage. Replace expansion valve coil as needed. See
"3.3.2 Repair procedures" [
4
67].
2 Remove the expansion valve coil from the expansion valve body, see
"3.3.2 Repair procedures" [ 4 67].
3 Slide the expansion valve magnet over the expansion valve body and gently
rotate the magnet clockwise/counterclockwise to manually close/open the
expansion valve. Listen to check if the valve is closing/opening and manually
close the valve when check is done.
INFORMATION
After the check, remove the magnet from the expansion valve body and install the
expansion valve coil on the expansion valve body. Make sure that the expansion
valve coil is correctly installed on the expansion valve body.
INFORMATION
It is highly recommended to perform a power reset after checking the valve using a
magnet.
Does the expansion valve open? Action
Yes Perform an electrical check of the
expansion valve, see
"3.3.1 Checking
procedures" [
4
63].
No Replace the expansion valve body, see
"3.3.2 Repair procedures" [
4
67].
To perform an electrical check of the expansion valve
1 First perform a mechanical check of the expansion valve, see "3.3.1 Checking
procedures" [
4
63].
2 Disconnect the electrical connector of the expansion valve coil from the
appropriate PCB and measure the resistance of all windings (between the pins
of each phase (wire) and the common wire) using a multi meter. All
measurements MUST be approximately the same.
Name Symbol Location (PCB) Connector Winding
resistance
Main
expansion
valve Y1E Main S20 46±4 Ω
INFORMATION
Below are shown examples of the resistance measurements in which the common
wire is connected to pin 5 or to pin 6 of the expansion valve coil connector.
Connections may differ according to the type of expansion valve.
▪
Connector pin 1‑5,
▪ Connector pin 2‑5,
▪ Connector pin 3‑5,
▪ Connector pin 4‑5.