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Components
Service manual
245
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Does the expansion valve open?
Action
Yes
Perform an electrical check of the
expansion valve, see
244].
No
Replace the expansion valve body, see
To perform an electrical check of the expansion valve
1
First perform a mechanical check of the expansion valve, see
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
Location (PCB) Connector
Winding
resistance
Upper heat
exchanger
expansion
valve
Y1E
Main
X21A
150±15 Ω
Sub‑cool
expansion
valve
Y2E
Main
X22A
46±3 Ω
Lower heat
exchanger
expansion
valve
Y3E
Main
X23A
150±15 Ω
Receiver gas
expansion
valve
Y4E
Main
X25A
150±15 Ω
Liquid cooling
expansion
valve
Y5E
Sub
X8A
46±3 Ω
Auto‑charge
expansion
valve
Y6E
Sub
X10A
150±15 Ω
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.
Summary of Contents for VRV IV+
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