Warm flow oil boiler

Hello, so this is to anyone that is great with heating systems.

It’s always been a weak point for myself.

I am currently doing a heating system at a home which has a warm flow oil boiler.

I’ve been told it has 4 zone valves

1-UFH
2-Upstairs radiators
3-Towel radiators
4-Hot water

It will have a 2 channel programmer (Honeywell) doing the upstairs rads + towel rads

Another 2 channel prog doing the hot water and hot water circulation

Lastly a single channel doing the UFH

Can anyone hit me up with a working wiring diagram which can help get this all working

Thank you

Not sure there is one as such.

It takes a bit of s plan schematics and a bit of your own design based on your knowledge of how heating systems and there components work.

I normally don’t work to a schematic as I was very luck to work for a heating company for a couple of years when I first qualified so learnt loads.

Hopefully I am wrong about there being a schematic and someone will point one out to you.

I’ve always felt that there was a need to incorporate heating systems into basic electrical training or a separate course.

Hi Craig
What you require is S Plan plus.

Try googling that or "s plan +"

There are loads of examples out there.

Basically it's a standard S Plan with as many additional zones as you require. The schematics will make more sense than made trying to describe it.

Thanks for the reply, I’m not going back to the job for a couple of weeks now.

So I’ll have a look at S plan + tonight and maybe try draw out my own diagram from it and have you guys tel me what you think.

I’ve never had the opportunity to really work with heating systems apart from a standard combi boiler with 1 stat. Hence the novice outlook towards it.

Please have a look at this and tell me what you think, I ain't 100% on the underfloor heating valve as that will be connecting into a manifold so maybe needs tweaked.

is the 1 Chanel programmer switched live (black) meant to be 6 r@ther than 7.

Are there any other temperature thermostats in the system.

Craig2022 said:

Please have a look at this and tell me what you think, I ain't 100% on the underfloor heating valve as that will be connecting into a manifold so maybe needs tweaked.

View attachment 52151

Click to expand...

Well that won't work,and it's not very easy to understand.

Draw a circuit diagram and it should become a bit easier to get right.
You need to start with understanding what each component is and how it works electrically, and then understand how to achieve the control functions you require.

Just matching up colours and numbers won't get you anywhere.

I think the drawing and labelling isn’t too bad and a very good first effort, it’s wrong but I won’t take that away from the attempt.

davesparks said:

You need to start with understanding what each component is and how it works electrically, and then understand how to achieve the control functions you require.

Just matching up colours and numbers won't get you anywhere.

Click to expand...

This is true Dave as if there is a fault or problem you can diagnose it.
[automerge]1568479123[/automerge]
How is the UFH being controlled most cases there are programmable room stats in each room of the UFH going back to a UFH controller which has a volt free relay to turn on the boiler. The stats can also be either mains or E.L.V. 3-core and earth or cat5 respectively check what is being provided by the plumber.

Craig2022 said:

Please have a look at this and tell me what you think, I ain't 100% on the underfloor heating valve as that will be connecting into a manifold so maybe needs tweaked.

View attachment 52151

Click to expand...

Draw the circuit rather than pictures with colours and numbers that don't show what is happening electrically. If it's easier break it down in to the simplest level of what is actually happening.
The motorised valves behave electrically the same as a simple relay and everything else is either switches or a load.
To start with ignore the additional lives and neutrals required for various electronics, just focus on the actual control circuits.

So the programmer is just a switch, thermostats are again a switch and valves are relays.
Pumps, the boiler etc are just loads (you could even represent these as lamps if you wish)
Take one channel at a time and work out which switches need to operate which load and in what combination.

So for the central heating you would have a permanent live to the first switch (programmer) the output from this switch feeds the second switch (thermostat) this then operates a relay (valve)
The relay output is connected to permanent live so that it switches on a load (boiler) when energised.

The hot water is the same.

The towel rails don't have a thermostat so the programmer operates the really directly.

The hot water circulating pump will be switched directly by the programmer so it is just one switch directly operating that load.

The underfloor heating we don't know for certain yet without details so assume for the moment it is the same as the central heating.

Now you should have a circuit for the actual controls, you can add the other bits like permanent live to the boiler, neutral to the room stat and programmer.

Hopefully this quick sketch will help illustrate what I mean.

Hi Craig 2022,
I like Davesparks idea of just concentrating on the relay switches and controls and forgetting about the permanent lives to get a feel for the actual operational way it runs.

But I have to admit I prefer the simpler way you have drawn it.

Courses for horses, each to there own.

Paignton pete said:

Hi Craig 2022,
I like Davesparks idea of just concentrating on the relay switches and controls and forgetting about the permanent lives to get a feel for the actual operational way it runs.

But I have to admit I prefer the simpler way you have drawn it.

Courses for horses, each to there own.

Click to expand...

How on earth would you learn how the circuit works, install or fault find from the pictures and numbers approach?
I appreciate my sketch is not the clearest, but it still makes more electrical sense

davesparks said:

How on earth would you learn how the circuit works, install or fault find from the pictures and numbers approach?
I appreciate my sketch is not the clearest, but it still makes more electrical sense

Click to expand...

Sorry if your upset by this.

It wasnt meant to be a criticism.

I think your approach is brilliant, I said as much in my reply.

I just prefer it the other way.

As i said each to there own.

Thank you all for the feedback.

The way I chose to go about the diagram was in a simple form which I understood. Drawing it out would probably of been worse as I don’t know all the symbols.

Where did I go wrong with my diagram?

The ufh have a stat for every zone which have 3c back to manifold area.

I’m taking everything you guys say in, as heating is something I would like to turn from being a weakness to a strong point of mine.

As far as I am aware, oil boilers don't modulate, so it is a simply on/off control. Basic idea is thermostat opens a motorised valve then all motorised valves have a micro switch in parallel to power boiler, so any motorised valve opening will fire boiler.

This is the whole idea of the S plan.

Not sure why you need a programmer other than maybe for DHW, I personally would use programmable thermostats, that way no need for a frost stat.

Towel rail and DHW normally combined together that way the return water is cooler so boiler does not cycle as much, and a thermostat on the tank will normally run enough times in the day to dry towels, it may not heat the bathroom enough but that's not what a towel rail is for.