UFH and other heating

[yellowvanman]

Got to wire up the heating system in a house later this week and its not totally straightforward:

UnderFloorHeating on ground floor - 6 zones, radiators on 1st and 2nd floor, hot water cylinder and a set of towel rails, all of which need to be on different timers (4).

Problem is when joining all the boiler 'calls' up together, if the UFH heating is calling for heat then that could (would) start up some of the pumps for the other circuits with the respective valve not open. Normally S plan for instance wouldn't start pump until valve in open position.

Probably need some sort of relay switching, can anyone share their experience on this?

 

[needasparks]

Don't forget each zone is controlled by its own port valve from each stat calling, most have all pumps conected together so not a problem. Only gets tricky if the boiler is not a 240v stat but not too many about these days. depending how the manifold(s) are looped UFH just have port flexes common in a wiring centre.

 

[yellowvanman]

Thanks for reply. The UFH is straightforward got a Polypipe Master/Slave units that looks after the UFH and calls the boiler when needed. This has 2 manifold, 2 valves and 2 pumps with 6 zone controllers.

But alongside this lot there are 3 other systems - for the radiators, towel rails and hot water. Each has its own pump and valve.

If I combine all the boiler calls the following could happen.

UFH calls the boiler for heat, boiler kicks in but the 'call voltage' is backfed to the pumps for the towel rails, radiators and hot water and non of the valves may necessarily be open, so the pumps are running but the water isn't going anywhere!

Maybe this isn't a problem!

 

[needasparks]

Yes thats how most are done when you build it yourself prob is you do get through pumps over the years unless the pumps are via the stats, the water still runs through the manifold though, just remember the port valves act like two way switches when open or closed, i did do a purpose built system some years ago made in germany i recall, it had 4 timered controllers each with 7 zones of heating loops with a room stat in every room in the house controlled independant to each other.

good luck with it fella.

 

[Deleted member 9648]

You need to feed each pump from the corresponding valve switching output,and from that feed a separate relay coil for each pump/valve combination. Link a perm live to one side of the N/O contacts of each relay, link the other side of the contacts to the boiler trigger.