Fraser Lamont

Thread moved here. Thanks all!!

@Nickfromwales would this work, a bypass at the end of one of the manifolds? My system is getting on for 15 years old now, the first couple of years the upstairs bedrooms and bathrooms only were on thermostats, I had to retrofit the controllers for downstairs, far too hot, very cheap to run because of all the water pipes in concrete, but too warm.

Subject moved to it's own thread. Nick from Wales, could you repost your last image to the new thread? I came up with a plan that could be similar to yours. TIA

The other thing, if the main circulation pump is rewired to the heat pump then switches off when not in heating mode, there'd be no return water for the heat pump to work out the temperature of the water in the system. There's always a 5c difference, say the water return is 34c (cold outside temperature), then the heat pump cycles until the return water temperature hits 39c then stops. Would I then have to rely on the main indoor air temperature sensor which provides settings such as how much influence (1 - 10) the heat pump should use based on these readings? Jeez, this could get complicating

Hi, no, it was designed for half my heating circuit to be open permanently but the house was 28c. It was designed that way so the Heat Pump could always sense what the return temp is, thereby work out when to cycle the heating. That was before every room had it's own Temp controller - the Heat Pump was doing that job before (crudely). Now I have full zones and buffer, I think the Heat Pump should now be only switching that circulating pump when it's on underfloor heating mode - for just now I've had to remove the Valve Motorized Head (manifold) from one of my upstairs bathrooms just to stop the pressure from the pump fighting against closed circuits. The other 2 pumps on manifolds only come on when a room calls for heat (Heatmiser UH1-W). My Installation book does mention controlling the "External main pump in the heating system G1(P1): The external main pump should be connected to the terminal card in those cases a bypass is required. The pump is connected to terminal P1". I do have a bypass installed - nowadays they probably use automatic bypasses. Thanks

Anyone have any advice on circulation pumps - after moving from non buffered with half my loops open to a completely zoned and buffered situation? My external heating circulation pump (nearest Ground Source Heat Pump) is wired to what looks like a small consumer unit on the wall. I think the GSHP controls this when on 'summer disconnect', I believe it's the only time of year that it gets switched off. I was told by the supplying company that the pump would always be on outside of the summer months to keep water in the loops because the Heat Pump needs to sense water return temps. Now I have a buffer tank, all zoned areas are controlled by thermostats, the manifold controllers (one each for ground and first floor) turn off their respective circulating pumps when no heat is required, but the pump external to the Ground Source Heat Pump keeps going. Now that I have a Buffer Tank, should this pump now be wired and controlled directly by the Heat Pump? I'm concerned because if no heat has been called for from either manifold - all loops will be closed and the circulating pump will be continually pushing water against closed circuits. Diagram attached - I haven't included the pipe runs for the Domestic Hot Water. Many Thanks