3-Way Valve M3S - Daikin EDLQO5CAV3 Service Manual

ESIE15-08B | Part 2. Troubleshooting

4.10. 3-way valve M3S

Technical specification
The 3-way valve is driven by a 230 VAC motor. Motor and valve can be replaced
separately.
Location
Wiring diagram
Check procedure
Mechanical check
1. Switch off the Daikin Altherma Monobloc CA via the user interface.
2. Switch off the Daikin Altherma Monobloc CA with the field supplied circuit breaker.
3. Locate the 3-way valve in the system.
4. Check that the knob is fully pressed (= motor control).
5. Check that the knob is either in domestic hot water or space heating position but not in an intermediate position.
Electrical check
W : R
ARNING
• When reconnecting a connector to the PCB, do not apply force or damage the connector or the connector pins on
the PCB.
1. Switch off the Daikin Altherma Monobloc CA via the user interface.
2. Switch off the Daikin Altherma Monobloc CA with the field supplied circuit breaker.
3. Remove the hydrobox top plate assembly, refer to
4. Remove the hydrobox front plate, refer to
5. Remove the switch box cover.
6. Power the Daikin Altherma Monobloc CA and activate domestic hot water.
7. Measure the voltage between X26A: pin 1-2 on PCB A1P; if no 230 VAC is present:
- check fuse FU1 on PCB A1P, replace if blown,
- Check the voltage between X19A: pin 1-3; if no 230 VAC present, check main power supply on X1M.
- Check the voltage between X1A: pin 1-3; if no 230 VAC present, check main power supply on X1M.
- If 230 VAC is present on X19A: pin 1-3 and 1A: pin 1-3, replace PCB A1P.
8. Measure the voltage on connector X26A: pin 2 and X20A: pin 3 on PCB A1P; if no 230 VAC is present, replace PCB A1P.
Page 84
Daikin Altherma Monobloc CA
Switch box - Control Box
A4P
F2B
X4M
F
ISK OF IRE
"Removing the hydrobox top plate assembly" on page 110
"Removing the hydrobox front plate" on page
Description
The 3-way valve is used to circulate the water in
the water circuit through the domestic hot water
tank or through the space heating circuit.
Unit
X1M
X8M
4. Component checklist - Water Circuit
Not applicable
111.
19/07/16