Heating wiring advice please

young sparky · Sep 25, 2017

hi guys, wiring a new build and struggling with the heating as haven't done to much of it in the past and looking a bit of advice, have underfloor heating down stairs and radiators up stairs, 4 zones for underfloor and one stay upstairs for radiators, in told by plumber no timeclock is necessary and the house will always have hot water, would really just like a wiring diagram for this, I will post pictures of all the diff devices installed by plumber and if I had a diagram I could take it from there, knowledge of heating systems is very limited, thanks in advance

[ElectriciansForums.net] Heating wiring advice please

Taylortwocities · Sep 25, 2017

@young sparky
What you are embarking on is a complex project. There are many aspects to this.

Wiring the underfloor manifold system is going to need quite some thought (I see they did at least provide a wiring centre for you)

You really need an electrician on site who is experienced with heating systems, and you can learn it from him/her. Or go on Honeywell training course. I really do not think you'll ever get what you need from an Internet forum.

You are going to need to think about how you will power the various parts of this, especially so that there is a single point of isolation for all of the Boiler and DHW and heating. Also, there seem to be two immersion heaters to power.

young sparky · Sep 25, 2017

thanks for the reply , yea I don't do too much in this area so knowledge is quite limited to be fair but if I had the correct drawing for this I could at least wire it and if was in any difficulty get another electrician for the second fix, as regard the two immersion heaters only the one (bottom) will be used

Taylortwocities · Sep 25, 2017

Your issue is that there is not one single wiring diagram for this. The external condensing unit and its associated boiler is one project. The UFH manifold is another, the upstairs rads are another, the DHW is another.

Also, how has the plumber done his system? S, plan, Y plan or some other plan.
The standard variations are to be found here
Wiring Guide Issue 16 - Honeywell
As you can see there are lots to choose from!

But, as I say, what you are dealing with is not mainstream. You'll have multiple calls for heat to the boiler, so you'll need to decide how that will be achieved.
Does the boiler have its own internal over-run pump. How will the heating be timed, do the stats have their own individual timers?

Taylortwocities · Sep 25, 2017

PS I also wonder about this

young sparky said:
told by plumber no timeclock is necessary and the house will always have hot water

That is a big tank. I would want the hot water to be timed, oltherwise you are keeping the tank full of hot water 24/7. And how about holidays? Most people likle to turn off the DHW and turn the heating down when they go away.

davesparks · Sep 25, 2017

Looks pretty simple, you just need to find out what controls are wanted for the upstairs and hot water zones.
The wiring diagram for the underfloor system should have been provided with the control box, if not a quick internet search should find it.

young sparky · Sep 25, 2017

So far I just pulled cables in for the room stats and out to boiler, all is downstairs is the manifold and a pump, boiler is outside and the tank is upstairs, it's just getting my head around what goes where as this is pretty new, the fact there is no timeclock is baffling me a little tho

Taylortwocities · Sep 25, 2017

If no time clock, the DHW will be controlled merely by the cylinder temperature stat.

young sparky · Sep 25, 2017

All wiring drawing of this seem to include a time clock, have found a few similar to my situation, but nothing the same

Taylortwocities · Sep 25, 2017

The time clock is just an on switch. Just wire it as if the click is always on.

sweet212 · Sep 25, 2017

Young Sparky,

It really helps to know what each part of the heating system does on the plumbing side as well as the electrical side of things.

James

young sparky · Sep 25, 2017

Yea James definitely, but want to just get this wired and get someone with a bit more experience on these to give me a hand with the 2nd fix of it, plumber on site wasn't much help really and didn't really want to help too much, but it's something I want to learn a lot more about, been doing industrial for last 8 years but last couple of rewires I done on the odd occasion I got another guy to sort the heating, unfortunately I never took in whatvwas going on with it but need to start to learn more about it

davesparks · Sep 25, 2017

young sparky said:
So far I just pulled cables in for the room stats and out to boiler, all is downstairs is the manifold and a pump, boiler is outside and the tank is upstairs, it's just getting my head around what goes where as this is pretty new, the fact there is no timeclock is baffling me a little tho

How did you know what cables to install without a wiring diagram or knowing what you need?

Something that really annoys me when I'm connecting up heating which has been 1st fixed by someone else is seeing a lot of cable wasted because they just pull in twice as many cables as necessary 'just in case'

ferg · Sep 25, 2017

The thing with anything new is to take your time to understand it.

Failing that follow the instructions blindly and hope for the best.

It's not really as complicated as you are making it.

Just spend a couple of hours with the diagrams in peace and quiet and you should be fine.

It's mostly just basic logic. AND OR.

Taylortwocities · Sep 25, 2017

ferg said:
It's mostly just basic logic. AND OR

With a handful of IFTTT

Heating wiring advice please

young sparky

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Taylortwocities

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young sparky

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Taylortwocities

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Taylortwocities

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davesparks

young sparky

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Taylortwocities

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young sparky

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Taylortwocities

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sweet212

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young sparky

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davesparks

ferg

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Taylortwocities

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