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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
 
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]
 
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
 
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?
 
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.
 
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.
 
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.
 
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.
 
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Good grief

If you don't understand how domestic boiler controls work and how to wire them correctly within electrical and plumbing regulations then employ an electrician who will do it for you, and if you ask nicely they might even explain it to you.

This is a ridiculously simple control circuit however many underfloor heating zones or whatever else you add to it.


Sent from my iPad using Tapatalk
 
Good morning,Dave...

I sense your furry...(an extra "r" to cheer you up:))

I think a lot of lads,lack more in confidence,in these areas,than acumen,and either over-think things,or don't feel like getting deeper.

Your comment about asking a competent electrician,to explain things,made me remember a chat i had some time ago,with a "specialist CH" spark,me mate had involved,on a project.

My pal is a very capable boiler engineer and agent,for a large manufacturer,and had employed a highly recommended CH spark,to install all the new gear,in addition to incorporating some of the old.

A brief conversation with him,revealed a quick and detailed explanation of what goes where,including connections paths (wet) and wiring colours and nomenclature. He knew what valve/controller/systems were compatible,and what was the difference between the various qualities of equipment.

In short,an apparent professional.

When asked about the actual electrical function of,say,a 3 port valve,he didn't have a clue.

He knew WHY it worked,but not HOW. Further questions proved similar,and i could see i was testing his patience...so i apologised,and explained i was only seeking to work out how his fault-finding proceeded,if such knowledge was lacking.

His reply was "I've got 3 months work ahead of me,so why worry..."


The only reason for this long-winded digression,is i think quite a few lads fall into this category,where they may be mustard at their job,highly rated and worked-up...but could not honestly post on here,that they knew the electrical principles,going on in say a 3 port,and therefore run the risk of getting the back ripped off em'.

That said,a great many of Daves opinions,are shared by myself...fear and etiquette,maintaining my silence! :rockon2:
 
The thing with central heating systems is that they aren't taught very well if at all at college. Now unless you have a good mentor throughout your apprenticeship, which covers that area of work then how are you meant to learn? Mistakes can cost time and money but can be one of the most influential learning curves.

like most things, technology is improving and gone are the days of "one size fits all". Each area is becoming more and more specialist with a need to have much more knowledge. If its an area your not overly familiar with then it can be overwhelming. So how do people learn without asking questions or doing research in order to familiarise with something?

just food for thought, I don't mean to get off topic or offend anyone.
 
I'm with tomspark93 on this one, I finished college Having only half an hours look at any sort of heating system wiring, before the AM2 (where everything is labelled up so it's just a case of following a wiring diagram) and having worked purely in commercial/Industrial such heating systems where unknown to me.
Don't get me wrong, I could follow a diagram and wire any system up (don't hold me to that) But, Could I design and wire a system that is not as standard, Or could I fault find on such a system without seeking advice, Then I'd have to say probably not.
 
I would probably say one of my specialist areas is heating wiring. I self taught myself most of it as only probably done about 4 systems throughout my apprenticeship. I have contracts with a few local heating firms doing all their wiring from simple combi boilers to UFH heating systems with multiple zones, multiple fuel sources and so on.

I also do the heating wiring for about 3 other sparks round my way when they have such a system as part of a job as they don't seem to be able to get their head round it.

I would say the best way to learn it is to understand the plumbing side of it 1st like the basic layout of such systems, learn how each type of valve operates and what colour does what then learn/understand the sequence of how it all switches. once you understand the basics its easy to wire up standard and non standard systems and also fault find on them.
 
heres the megaflow connections and hot water valve Never done a s plan. Stuggling 13493032_10210141577806283_616633846_n - EletriciansForums.netNever done a s plan. Stuggling 13514305_10210141577726281_1842712574_n - EletriciansForums.netNever done a s plan. Stuggling 13514449_10210141577566277_1764160556_n - EletriciansForums.net


basement , ground , first , second all have uh4 heatmisers. at each heatmiser i have a 2 core and earth and a 4 core and earth going to the basement "boiler"

first floor i have an extra cable called emission "4 core and earth" going to the boiler. on the first floor that is where the cilender is "megaflo eco 250" i just dont get the wiring diagram or what gose where

i have taken over someone else job. its been an uter nightmare and stressful and just cant get my head around this. :/
 
heres the megaflow connections and hot water valve View attachment 32501View attachment 32502View attachment 32500


basement , ground , first , second all have uh4 heatmisers. at each heatmiser i have a 2 core and earth and a 4 core and earth going to the basement "boiler"

first floor i have an extra cable called emission "4 core and earth" going to the boiler. on the first floor that is where the cilender is "megaflo eco 250" i just dont get the wiring diagram or what gose where

i have taken over someone else job. its been an uter nightmare and stressful and just cant get my head around this. :/

Connect the valve to the hot water valve terminal within the wiring centre apart from the brown. connect terminal 1 of the cylinder thermostat to the terminal you have left over where you haven't connected the brown. connect terminal 2 of the cylinder thermostat to the brown of the valve using a leaver wago or the like.

Edit: just looked at your 1st pic and notice it says 3 port? you said you have an S-plan.....An S-plan will have a two port for the hot water not a 3port.

If you have a 3port due to it being unvented you will also have a two port.

what do you have? as I've based the above on you just having a two port.
 
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what about the connections back at the boilet left with a 4 core and earrth and 2 core and eath for every floor " the emersion 4 core and earth from the 1st floor
 

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