Never done a s plan. Stuggling

[Mike Blair]

I have never wired an s plan so struggling lol


I have a heatmiser uh4 underfloor heating controlers inhave one on each floor basement ground first n second.

I have a megaflo eco 250 on the first floor

And a boiler on the basement forgot the name i will update

I have no idea how to connect it. Il upload some pictures soon

Any advice in the mean time

 

[hightower]

John Ward videos are fantastic as an introduction. This one specifically is Part 2 which covers S Plan, but might be best starting at Part 1 if you need.

[video=youtube;V9rN5D-wQIc]https://www.youtube.com/watch?v=V9rN5D-wQIc[/video]

 

[davesparks]

Read the wiring diagram, learn how the circuit works and you'll be fine.
It is essentially just a couple of switches in series operating a valve (which electrically operates like a single pole relay) for each zone. It's arguably simpler than a lighting circuit

 

[Leesparkykent]

I have never wired an s plan so struggling lol


I have a heatmiser uh4 underfloor heating controlers inhave one on each floor basement ground first n second.

I have a megaflo eco 250 on the first floor

And a boiler on the basement forgot the name i will update

I have no idea how to connect it. Il upload some pictures soon

Any advice in the mean time

what you have isn't a typical S-plan. Is there a manifold, pump and zone valve on each floor as well?

 

[djelectric]

Was in the same situation last week on a Friday, started at 4pm finished at 8! all but one cable were present but i didn't have the foggiest! Watched this and it all made sense: https://www.youtube.com/watch?v=jc6tFL9TZsk

 

[Leesparkykent]

Was in the same situation last week on a Friday, started at 4pm finished at 8! all but one cable were present but i didn't have the foggiest! Watched this and it all made sense: https://www.youtube.com/watch?v=jc6tFL9TZsk

That's all well and good but the op doesn't have a standard S-plan. He has an UFH system with multiple zones on multiple floors which in turn means multiple pumps, valves, thermostats, actuators and so on.

 

[djelectric]

That's all well and good but the op doesn't have a standard S-plan. He has an UFH system with multiple zones on multiple floors which in turn means multiple pumps, valves, thermostats, actuators and so on.

I realize that but I still think that video will help the op understand the basics (it definitely helped me). Get all your permanent lives, neutrals and earths out of the way first then work out your switched lives, one zone at a time. Get the plumbers number who fitted it, he'll tell you what should control what.

 

[Leesparkykent]

I realize that but I still think that video will help the op understand the basics (it definitely helped me). Get all your permanent lives, neutrals and earths out of the way first then work out your switched lives, one zone at a time. Get the plumbers number who fitted it, he'll tell you what should control what.

He says he has heatmiser uh4's though so wont be using conventional wiring centres as these have PCB's.

 

[djelectric]

He says he has heatmiser uh4's though so wont be using conventional wiring centres as these have PCB's.

I see what you mean, here's the manual for the UH4 OP if you haven't got it already: https://www.heatmiser.com/en/heatmiser-manuals/

 

[Leesparkykent]

Mike its pretty simple really. The supplies to each UH4 should be as one so ideally a switched fused spur next the boiler, out of the load of the switched fused spur loop in and out to a double pole switch next to each UH4 on each level so each floor has a point of isolation.

Follow the wiring diagram on each floor for each of the UH4's. obviously you only have the hot water part to worry about on the 1st floor so ignore it on the diagram on the other floors.

You need to common/wire in parallel the boiler enable of each UH4.

Depending on the boiler you may have pump over run, if it does the pump on the flow from the boiler (not the UFH pumps) needs to be connected to the pump over run terminal in boiler.

If It doesn't have pump over run the pump mentioned above needs to be connected to the switched side of the boiler enable.

If the boiler is a system boiler you don't need to worry about the pump mentioned above as there wont be one as its internal to the boiler.