Feed back problem

[Megavolt]

Hi all

I have a boiler plant that has a heating and hot water circuit. The problem I have is there is not any zone valves on this system which I would normally use to stop any back feeds.

So the system uses two pumps one for hot water and one for heating.

There is a two Chanel time clock. The hot water output goes via a cylinder stat to the hot water pump and boiler the heating output goes via a room stat to the heating pump and boiler.

I think this can be done with a relay but I do not know how.

Hope I have supplied enough info

Cheers

 

[HandySparks]

Two relays needed. One driven by the output of the roomstat, other driven by output of cyl stat. The relay contacts switch permanent live to the boiler.