S plan heating system

Rob brazendale · Dec 6, 2018

Hi guys new to the forum. I’ve landed on a job on a dental surgery. The plumbers have installed new heating and got water system and basically left me to wire it up. Struggling to get my head around it and could do with some help. They’ve installed two boilers that are going to work together, two pumps one for c/h one for h/w. There’s three zone valves two for downstairs and one for upstairs. There’s also a h/w cylinder with a cylinder stat. They then want three room stats for c/h two downstairs and one upstairs. Any would be appreciated cheers

Leesparkykent · Dec 6, 2018

[ElectriciansForums.net] S plan heating system

Rob brazendale said:
Hi guys new to the forum. I’ve landed on a job on a dental surgery. The plumbers have installed new heating and got water system and basically left me to wire it up. Struggling to get my head around it and could do with some help. They’ve installed two boilers that are going to work together, two pumps one for c/h one for h/w. There’s three zone valves two for downstairs and one for upstairs. There’s also a h/w cylinder with a cylinder stat. They then want three room stats for c/h two downstairs and one upstairs. Any would be appreciated cheers

It’s basicaly an S plan+

Toneyz · Dec 6, 2018

The only thing that has thrown me is the two pumps? what type boilers are they?
No valve for the H/W then?

Yplan · Dec 6, 2018

Are you a qualified sparky?

Separate these zones and the hot water system and draw it out should be easier to get your head round

Shoei · Dec 6, 2018

anthonybragg said:
The only thing that has thrown me is the two pumps? what type boilers are they?
No valve for the H/W then?

Prob a valve short but had a spare pump on the van

Yplan · Dec 6, 2018

The pump on the boiler for the hot water circuit is unusual because it's usually inside the boiler but maybe a secondary return.

buzzlightyear · Dec 6, 2018

Yplan said:
The pump on the boiler for the hot water circuit is unusual because it's usually inside the boiler but maybe a secondary return.

go and speak to tap on the brain and ask what system they have put in .

Rob brazendale · Dec 6, 2018

Cheers for the reply’s guys. Sorry I missed the valve for the h/w it does have one. The boilers are Worcester ones. I’m a qualified spark I work on mainly commercial buildings. Not done ant s plan since the am2.

buzzlightyear · Dec 6, 2018

Rob brazendale said:
Cheers for the reply’s guys. Sorry I missed the valve for the h/w it does have one. The boilers are Worcester ones. I’m a qualified spark I work on mainly commercial buildings. Not done ant s plan since the am2.

go on the dark tinernet ,and pull of what LZ put on post 2# and file it .

Yplan · Dec 6, 2018

Draw it out on paper for the heating separate from the hot water just to divide and conquer and you will see its rather simple as it's all in series pal.

Rob brazendale · Dec 6, 2018

Thanks. I’ll post a pic up when I’ve drawn it out.

buzzlightyear · Dec 6, 2018

RB ,you need to change your business name sounds like you are robbing electrical.

Toneyz · Dec 6, 2018

Rob brazendale said:
Cheers for the reply’s guys. Sorry I missed the valve for the h/w it does have one.

You need to tell us.
so you have 3 heating zones (2 downstairs 1 upstairs) each one with a valve and controlled by a room stat
1 H/W zone valve controlled via tank stat.
two pumps one for the system? one for secondary return?
Is this correct?

Rob brazendale · Dec 6, 2018

Hi Antony this is correct. They want each zone to have its own room stat if this is possible. Cheers

Toneyz · Dec 6, 2018

Has any of this been wired or plumbed?

Rob brazendale said:
Hi Antony this is correct. They want each zone to have its own room stat if this is possible. Cheers

Yes one room stat to each valve one tip ask the plumber which valve does which area and mark up each stat. Look at Lee's wiring diagram. Ask the plumber what each component does and post some photo's if possible.

Rob brazendale · Dec 6, 2018

It’s all been plumbed up. I’ll draw up a diagram and post it on here. Cheers

Rob brazendale · Dec 6, 2018

It’s ok been plumed in. Cheers I’ll draw up a diagram and post it on here. Thanks

Leesparkykent · Dec 6, 2018

Rob brazendale said:
It’s ok been plumed in. Cheers I’ll draw up a diagram and post it on here. Thanks

What are the two pumps for?

Toneyz · Dec 6, 2018

Leesparkykent said:
What are the two pumps for?

This is what I was trying to find out from the OP, Lee we think one is for the system and the other is for secondary return but waiting for the OP to confirm from the plumber.

Leesparkykent · Dec 6, 2018

If it’s a secondary return it should be obvious as it will be plumbed into the cylinder secondary return...The pump will have bronze or SS impellers and the housing is usually yellow if it’s a grundfos pump.

Rob brazendale · Dec 6, 2018

Does this look something like just for c/h. As I add the extra zones in a just add a stat on the next free connector block

PEG · Dec 6, 2018

Out of interest,how are the two boilers twinned up?

Toneyz · Dec 7, 2018

As shown, but need an isolator to each boiler. Assuming that it is switched live, N&E to each boiler.

Deleted account · Dec 7, 2018

Yplan said:
Are you a qualified sparky?

Separate these zones and the hot water system and draw it out should be easier to get your head round

Never a good idea to get advice on an Splan from a Yplan.

Deleted account · Dec 7, 2018

Never come across 2 boilers twinned up? Why would you do this?
Surely it would be better to have a couple of zones of one boiler and a couple of the other.

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