Evening all. I have a query I'm hoping someone can help me with. I have just had an extension built and have wet underfloor heating and radiators in rest of house . There is only one pump live from the boiler . Problem I have is whichever source of Heating is selected both pumps come on . Anyone any idea how to wire this up So I can have either under floor heating or radiator pump on individually ?? I have 3 x 2 port zone valves . For underfloor , radiators and cylinder .
Is it one of those single zone manifolds like this or a traditional multi zone one - has it got actuators on it If its a traditional one then I would connect the UFH pump to the brown of the UFH zone valve controlled by the UFH thermostat.
It shouldn't need to, the main pump should wire from the boiler and will overun and the UFH pump will only run when the UFH stat calls for heat.
There isn't a main pump . It is a heat only boiler no pump inside the boiler . Just the radiator/cylinder pump and UFH pump . Both pumps take their live from the boiler
The radiator/cylinder pump should also be pumping to the manifold. The UFH pump circulates the floor, not from boiler. Photos of plumbing?
I agree, the pump connected to the boiler should be before the 3 zone valves or on the return near the boiler, this will pump through whichever zone valve is open. The pump for the under floor heating only circulates round the blending valve and UFH pipe circuit. As said pictures would be useful, I wonder if its piped up correctly even.