Relay wiring for motorised valves

Tamantojo · Sep 21, 2022

I have 2 motorised valves controlling 1 pump. Does anyone know how to wire relays(2)
to avoid backfeeding All 230v
thanks in advance.

davesparks · Sep 21, 2022

What type of motorised valve and are any other independent switched outputs required from this setup?

If they are standard 2 port central heating type motorised valves and aren't required to provide any other switched outputs then you don't need relays as the internal microswitches will do the job.

Unless this is switching a higher powered pump that the microswitches can't handle?

Tamantojo · Sep 21, 2022

davesparks said:
What type of motorised valve and are any other independent switched outputs required from this setup?

If they are standard 2 port central heating type motorised valves and aren't required to provide any other switched outputs then you don't need relays as the internal microswitches will do the job.

Unless this is switching a higher powered pump that the microswitches can't handle?

Tamantojo · Sep 21, 2022

End switches are low voltage and out of the equation.
the problem is I have two separate motorised valves controlled by stats. But only one pump. It’s getting the pump to come on with either valve With no backfeeding.
thanks

davesparks · Sep 21, 2022

Tamantojo said:
End switches are low voltage and out of the equation.
the problem is I have two separate motorised valves controlled by stats. But only one pump. It’s getting the pump to come on with either valve With no backfeeding.
thanks

You say everything is 230V and the end switches are low voltage, so what is the problem?

Please could you be a bit more specific about whhat make/model of valve you are using?

Tamantojo · Sep 22, 2022

Controls are from heat pumps and are low voltage. They are not in the equation. I have 2 motorised valves
And two relays and 1 pump. When activating any valve I want to open valve via stat which is no problem. The problem arises a pump has been added and need any one of the valves to operate the pump but I can’t get it thru relays without back feeding

Aaron b · Sep 22, 2022

[ElectriciansForums.net] Relay wiring for motorised valves

It's a bit rough as I was leaning on a steering wheel... Use a double throw relay with the common connected to the boiler feed.

brianmoooore · Sep 22, 2022

As davesparks has already said, standard motorised valves have built in microswitches, and these switches are volt free. There is no prospect of back feeding from the switch to the circuitry controlling the valve.

Tamantojo · Sep 22, 2022

Appreciate your help it was as simple as each valve controlled a relay with the pump connection out of each on normally open. Thought I had tried this at the beginning but obviously not.