UHF wiring help

[SparkDownSouth]

Morning all, just after some help with some UFH wiring on my job im doing

Doing an extension which has UFH in the extension with its own UH4, hard wired stats and zone valve (all working and firing as should)

There is an additional loop in the existing house with has its own UH4, one hard wired stat, zone valve (separate location to the UH4) and a pump, I currently have a 3core cable going from the zone valve to the UH4 for my L,N & SW

My questions is that as my SW goes to fire the boiler (orange) how do I stop the pump firing up when an other zone valve is firing up?

 

[brianmoooore]

Probably something along the lines of using the brown to the valves to control the pumps and the orange to control the boiler.

 

[davesparks]

Use a relay to create two separated switched lives

 

[Pretty Mouth]

Perhaps I misunderstand the question, but doesn't the UH4 do away with this problem?

 

[freddo]

^It should do, as it has separate output relays, multiples are designed to be connected together without problems. You need more than 3 cores to the zone valve though. The floor pumps should be connected to the pump terminals in the UH4 and the main pump should run with the boiler.

Do you have some photos of the wiring?

 

[Pretty Mouth]

3 core wouldn't, but 3 core and earth should I think. The live from the UH4 could feed both the brown and grey of the valve.