Daikin VRV IV+ Service Manual page 245

To perform an electrical check of the expansion valve
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Does the expansion valve open?
Yes
No
1 First perform a mechanical check of the expansion valve, see
4
procedures" [ 244].
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
Upper heat Y1E
exchanger
expansion
valve
Sub‑cool Y2E
expansion
valve
Lower heat Y3E
exchanger
expansion
valve
Receiver gas Y4E
expansion
valve
Liquid cooling Y5E
expansion
valve
Auto‑charge Y6E
expansion
valve
INFORMATION
Below is an example of the resistance measurements in which the common wire is
connected to pin 6 of the expansion valve motor 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.
Action
Perform an electrical check of the
expansion valve, see
4
procedures" [
Replace the expansion valve body, see
"Repair procedures" [
Location (PCB) Connector
Main X21A
Main X22A
Main X23A
Main X25A
Sub X8A
Sub X10A
3 Components
|
"Checking
244].
4
247].
"Checking
Winding
resistance
150±15 Ω
46±3 Ω
150±15 Ω
150±15 Ω
46±3 Ω
150±15 Ω
Service manual
245