What Central heating system is this?

[Crosswire]

I will make an assumption there is a manual manifold with each zone controlled by a regulator on the top of the manifold. I will also make the assumption that it’s a conventional manifold rather that a ZRU.

I think you will have 2-channel controller one channel for DHW and the other for UFH.

Looking at the UFH, its simple, any one of the UFH stats will initiate the zone valve to UFH and once in the correct position start the pump and fire the boiler, once the water is flowing to the manifold the individual zone regulators on the manifold will either allow water to pass into the appropriate zone or not.

Basically it’s a modified Y plan.

If you check the plumbing, there should be only one mid position valve, however, if there are two single port valves, let me know because its slightly different.

Hope that helps.
Ian

Ok the plumber is coming on Wednesday to fix a leak, so I will pick his brains as to what he installed, (if I can take the shame of asking a plumber for help). Took photos but couldn't upload cos size was too big

Thanks for all the help and will report back with results

 

[Guest123]

Mmmm, tough one to advise on this mate as it seems to be a collection of seperate parts to complete the system.

Without being there and seeing it myself pumps, valves, stats etc, the most I could offer is an educated guess.

You may need some additional relays to avoid backfeeding, or perhaps the control centres have these built in. Hard to say.

 

[Crosswire]

Yeah was originally installed by Polish sparky who refused to finish job unless the client paid him more money, over and above the price!
Needless to say he was elbowed and I got lumbered with it Ho-hum such is life....

 

[ian]

Yep I agree with others, its difficult to say. The 4 wires from the manifold valve actuator head are the live & neutral. (The live will be the switch wire from the appropriate stat), the grey and black will be across a contact, which will, these will drive a valve, start the pump and fire the boiler, but without seeing it it’s difficult to say. You may need a relay to 2, depends how it’s plumbed.
Finally, it sounds like there are electrically operated actuator head installed on the manifolds, if so the some of info I gave you above is inaccurate, sorry I should never make assumptions.
Also ask the plumber if he has fitted a diverter valve (2 cores & earth) a mid position valve (4 cores and earth) or a zone valve (5 cores and earth)

 

[ringer]

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