Daikin VRV IV+ Service Manual page 338

3 | Components
To perform an electrical check of the solenoid valve
Service manual
338
Is the solenoid valve coil firmly fixed
and not visually damaged?
Yes
No
Prerequisite: First perform a mechanical check of the solenoid valve, see
"3.19.1 Checking procedures" [
1 Unplug the solenoid valve connector from the appropriate PCB.
2 Measure the resistance of the solenoid valve coil.
Result: The measured value MUST be 1.34 kΩ ± 5%.
Name Symbol
Liquid pipe Y2S
solenoid
valve
Is the measured value correct?
Yes
No
3 Re‑connect the solenoid valve connector to the appropriate PCB.
4 Turn ON the power using the respective circuit breaker.
5 Turn on the unit using the user interface.
6 Measure the voltage (power supply) on the solenoid valve connection on the
PCB. The measured voltage MUST be:
▪ 0 V AC when the solenoid valve is closed
▪ 230 V AC when the solenoid valve is triggered open
INFORMATION
Check the solenoid valve status using the service monitoring tool.
On a single unit the solenoid valve is open when the unit is operating.
On a multi combination:
▪
If there is enough liquid compared to the load, the solenoid valve may be
switched OFF in one of the units.
▪
When in high load operation, the solenoid valve will most likely be open on all
units.
Are the measured voltages correct?
Yes
No
Action
Perform an electrical check of the
solenoid valve, see
procedures" [
Fix or replace the solenoid valve coil,
see "3.19.2 Repair
4
337].
Location Connector
(PCB)
A1P X15A
Action
Continue with the next step.
Replace the solenoid valve coil, see
"3.19.2 Repair
Action
Perform a position check of the
solenoid valve, see
procedures" [
Perform a check of the main PCB, see
"3.11 Main
"3.19.1 Checking
4
337].
4
procedures" [ 339].
Winding resistance
1.34 kΩ
4
procedures" [ 339].
"3.19.1 Checking
4
337].
4
PCB" [ 290].
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05