DHW 3-way valve in heat pumps: command, position, and feedback

In systems that also produce domestic hot water (DHW), a 3-way valve diverts flow either to the heating circuit or to the DHW tank.

Controller command

When there is a DHW demand, the controller instructs the valve to change position.

Position feedback

In some systems, an auxiliary contact confirms that the valve has reached the correct position.

Common issue

A valve that gets stuck in the middle can incorrectly distribute the flow, reducing efficiency in both heating and DHW production.

Inspection

Verify the electrical command, mechanical movement, and the actual temperature change in the circuit.