Please could anyone suggest how i can easily wire 2 pumps to run on a underfloor system and rad system using a 3 port valve,
at the moment i can only get the second pump to run all the time...have thought of using a relay..to select the second pump,
i am pumping the underfloor system and the rad system from each side of the 3 port valve with a comman rtn,
I don't think the underfloor heating will work unless the second pump is installed because the resistance in the pipe will restrict the flow.
I can't quite visualise how a third zone can be added to what is essentially a two zone only system. Sorry, but I don't understand your description of how you have plumbed the underfloor heating now. I can't be sure, but from how you describe it, there is a risk of damage to the pump????
Connecting electrically should be simple, but it depends on how you want to control the second pump. Obviously, it needs a timer, a thermostat or both. What have you in place to use?
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