UFH wiring - no terminals for valve

24 Feb 2014
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United Kingdom
Evening all. Looking for some advice on a wet UFH install. I have a SCU209LED-TM wiring centre, which helpfully has no terminals for a 2 port valve (which is installed on the flow to the manifold). Link here:


Note that the system has programmable room stats only, so no Timer connections and due to it being part of a bigger system there is no connection back to the boiler (its effectively always on due to design of the system), its just the pump wired in to S1. Any advice much appreciated.
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I've asked for you to be moved to the Plumbing and Central Heating department.

Meanwhile - I don't know the answer but is this any help?

Thanks. I am not sure whether this remains valid if there is no boiler attached to G1 terminals?
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One option is to wire the valve to the L1 terminal and use the end switch in the valve to power the pump.
It does need a connection to the boiler to switch the boiler on when heat is demanded. (Leaving the boiler on at other controls is not a good idea)

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