4.9.15 3-Way Valve
Function
Diverts the water from the space heating system to the DHW plate heat exchanger and back based on
input from DHW flow sensor and PCB.
Failure Event
1.
No hot water in space heating mode.
2.
No domestic hot water in DHW mode.
Effects
In the case that the temperature of space heating is lower than the set temperature, it blocks the water
flow path for domestic hot water so that heating water can flow through space heating pipes.
Diagnostic
1.
Visual inspection: check the 3-Way Valve connection wire.
2.
Voltage check: Check range of voltage shown below.
Color/Number of wires
Blue-Black : ON AC 97 ~ 138 V, OFF 0 V
※
Confirm voltage as the 3-Way Valve operating
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