CENTRAL HEATING SYSTEMS - Gravity - Fully Pumped - Combi - Y Plan - S Plan
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- Опубликовано: 29 янв 2019
- CENTRAL HEATING SYSTEM DESIGN - Y Plan - S Plan - Gravity - Combi Boilers. My name's Allen Hart. Today I wanted to do a video about central heating systems. Different types of systems, so gravity, hot water systems, fully pump systems, and then combination systems as well. Gravity heating systems, Fully pumped heating systems, s plans, y plans, one pipe heating systems, two pipe heating systems. How to install central heating, design tips and tricks.
I'm gonna try to add a few different types of boilers in as well. We've got a combi boiler here. This combi boiler's actually got a flue heat recovery system up top. Also look at standard combi, look at hot water cylinders. Maybe look at some warm air as well.
A lot of base system design and a little bit of boilers. Just a bit of a mix really. Let's go and have a look now.
Going back in time to my days as an apprentice really. Floor standing. Floor standing boilers, open flued. A lot of the time these boilers was gravity hot water pumped heating so what you'd normally find is you'd find a couple of pipes there, like that. They might come out this side or that side. They could be ... Normally they'd be 28 mil and they would go up to a cylinder upstairs. They would just work on gravity. As water gets hot, water rises, goes up to the cylinder, and comes back down when it's cool. Takes quite a long time to for water to get hot and it's not controlled very well either. I'll do a little drawing about that and I'll show you what I mean.
A lot of time what you found with these, as well, is you might find that the pumps inside the boiler or the pump might be under the floor near the boiler as well. The pump would be for the central heating part of the system. We'll have a quick look now, I'll do a little drawing, and I'll show you about that.
Then we'll move onto looking at the updated version then of when we went onto a fully pump system. So we have S plans and Y plans so we'll have a look at that then as well. Let's have a look now.
This is a gravity hot water system in the most basic form. At the moment here we have a heating to this. How this works is the boiler fires up, the hot water goes up the pipe there so that would be the flow into the cylinder. Then, as it cools down, it would come back out and back to the boiler. There's no pump on that and that just works on gravity.
How that is controlled is there's only the temperature control on the boiler. When the boiler gets up to temperature it'll shut off so they control is ... It's not great. That's your basic diagram.
Then, this side of it, that's your cold water storage tank. Then you have your cold water going into your cylinder and your hot water coming out to the taps. Then for the heating system we would have two more pipes on here and you would have a pump on. Then that would pump 'round the heating. I'll show you a diagram now of this now with a pump on it and then we can see how that would work as well.
Sorry about the drawing. It's not perfect. If we imagine that is the boiler. If we was gonna add the heating now onto this, we'd add two other pipes. This one would be the flow and that would be the return. What you'd often find is the pump would actually be on the return back into the boiler. Then this would go 'round your heating system and you'd have your radiators on there. Could also be a one pipe system sometimes.
That's how that would ... That would fill so to get water into this system, normally, you would have from them pipes there going up in your airing cupboard, you'd have a pipe going off there. That would be your expansion pipe. That'd go into a central heating header tank. Then you'd have, off there, you would have a cold feed. That's how you'd get water into your gravity part of the heating system. Then that would fill the heating via the boiler.
If we had a one pipe system connected onto this boiler we'd have a flow and it would go all the way around the circuit and back to the boiler. Off that pipe these would just have tees and they would be connected underneath, maybe under the floor. It would always be one continuous circuit.
Obviously, these are not gonna work as well because they're only going to go into the radiator via gravity. For instance, if you wanted to try and power flush a one pipe system you'd really struggle and really it's almost impossible because you can't get the machine to go through the radiators. That's just a basic diagram of how a one pipe system would work.
I'll now show you a two pipe system as well. Again, I apologize for the poor quality drawing. This is a two pipe system. Just a basic figure I've done this. You've got your flow again and then it's two pipes. You've got flow and return there, aside of each other. When it goes into radiators you've got the flow that goes into that goes into the radiator and then you've got the return that comes out of radiator that then goes 
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Brill Alan you should be a teacher....... very calm and thorough 👍👌
Wouldnt have a clue how to teach but thanks for watching.
He is so carm like Bond James bond with a up north accent. Im a female engineer, I can say that😆
Your reaching now and your bloody brilliant
I'd say he's a teacher already... Educating people in his own field of expertise. I've learnt loads from Alan 🤗
Thanks for the videos, I've recently decided to try a change of career to plumbing at the tender age of 52!! Fed up of being in IT management after 20 years of stress, I've just started a plumbing course to do my nvq2, got my initial exams starting Monday so have had my head stuck in a book for a few weeks and doing test questions constantly, and seeing these videos really helps understand everything a bit better. Also I'm sticking a finger up to anyone who says I'm too old 😀
Good luck,
@@AllenHart999 thank you
Good luck to you mate, keep striving to learn and your be fine. Don’t know much about it management however I can tell your the life as a plumber if far from stress free. especially self employed it’s more than 1 job at once. Anyway best of luck.
Incidentally my apprentice is 46 years old. So at 52 I think your be fine. My boy is now changing rad valves on his own! 😂
@@heatservicebwcuk1545 thanks for the comments, I'm not expecting a stress free career, I worked for myself many years ago and it was a different kind of stress, mostly my IT career has been brilliant, just the last couple of years has been horrible. I'm looking forward to learning and working hard and seeing where it takes me. Out of interest, how did you find your apprentice? At the moment I've only done the theory exams, now waiting for the practical training but it's several weeks away and I would like to work alongside a plumber to get the knowledge in the meantime (and afterwards). I'm thinking I should approach my local plumber/gas man and ask him if I can work alongside him (probably for free initially as I have minimal skillset at the moment), is this the best approach do you think? (And if he says no then I ask others)
If you found this video helpfull please feel free to support my chosen charity. www.justgiving.com/fundraising/cchleeds
Very helpful video, I've just bought an older house than my current one and this has helped figure out the type of central heating.
Thanks for watching.
Great video! I'm training to be a property surveyor and I really struggle with services, this really helped me get my head around it!! Thank you Allen
Glad it was helpful!
Love your videos Allan, they really help a young up and coming plumbing and heating engineer 💯
Happy to help 👍
Brilliant video. I was told when we moved into our house we had an S plan. I had no idea what S plan was. Now I do.
Thanks for watching.
Alan I always watch your videos to get better understanding of my books, you explain things so brilliantly hopefully passing out with NVQ level 2 this year 👍 when I do not if fit will be down you and others sharing that brilliant knowledge 👍
Happy to help
Brilliant Allan,I’ve learnt so much from your videos 10/10
I have a new one coming soon, Don’t forget to ring that bell. Thanks.
Great Video Allen, very informative, also there getting much better, keep up the good work your a asset to the industry and us engineers who are always trying to keep up with the forever changing world of being a UK heating engineer.
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Great Video Alan, im currently doing my core gas and your videos are really helpful - thank you!
Thank You
Great video Allen your a very well learned central heating engineer truly enjoy your videos and if I’m ever in Leeds would like to go round learning from you keep the good work up Allen honest and to the point.
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Very good explanation. Your drawings are super clear. Thanks for dedicating your time and sharing your knowledge.
Thank you so much 😀
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Great video mate! Been trying to get my head round the different systems the past couple of days so this is just what I need cheers pal
Thank you for taking the time to watch it. 👍
@pmailkeey No, just trying to understand how heating systems work as I've recently started occasionally working for a gas engineer. I'm a painter decorator by trade but thinking about getting some proper trade tickets, not sure what the best route would be now though really... I'm 30 so a bit too old to take up an apprentice position from someone younger that really needs it.
Very good at explaining thank you so much
Good straightforward explanation thank you.
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You explain this stuff really well.
Thank You
Very good explanations.
Thanks 👍
That explains a lot, very informative video especially for me who doesn't have a central heating as we're too scared to be ripped off if we decide to have one. We moved to this property with only a storage heater and an immersion heater for our hot water. I'm thinking of DIY though I'm not a gas engineer so might as well ask the professional to do the job!!
Thank you for taking the time to watch my video.
Absolutely top notch video here mate. Liked and subscribed 👍🏻👍🏻
Thank you for taking the time to watch my video.
Another excellent informative video.
I would really appreciate you doing a video on a Thermaflow combi boiler. Thanks.
Very useful Video and easy to understand thanks 👍🏻
Thank You
Good teacher
Thanks for the help
Thank you.
Well done. Really enjoyable. Keep up the good videos.
Thank You
Brilliant, changed boiler on a 45 year old oil gravity hot & pumped heating system and adapting to an S-plan, just wanted a little clarification on the vent pipe coming off the cylinder!
Thank You
Great video, just what I needed. Thanks 😊
You’re welcome 😊
Happy Christmas
Cheers Allen.
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Excellent informative video.
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Great Video. Thanks 👍
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Brilliant explained. Great video
Glad it helped
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Good information, thanks
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Another great video Alan 👍🏼
Thank You
Great video, brilliant mate!
Thank You
Many thanks 👏
That’s awesome well done
Thank you Sir. 👍
You are the best Allen following u from algeria
Happy to help. Thanks.
Brilliant video. Forgot to mention the single feed Primatic hot water cylinder of which there are still many out there. A friend of mine had on of those and had his boiler replaced last year but the gas installer had not picked up on this when he surveyed the job. Let's just say things didn't exactly go to plan. It cost rather a lot more. All sorted now though
Too many different things to say them all but thank you for your comment. 👍
Smashed it😊, when you get a moment let's get a vid on a thermal store x2 pump system....
Thank You
great video and content huge help
Thank You
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Thank you keep up with the good videos
Thanks, will do!
I really like your videos very professional
Thank You
Spot on video.
Thank you.
Hi Alan, great video!
I wanted to install Tado to replace my old controller EP2000.
Where I'm slightly confused is gravity vs S plan. Old setting on EP2000 would suggest that it is gravity but I can see that I have as well 2 valves - controlled by some Honewell controller.
Would gravity still have 2 electric valves like in S plan? One is next to hot water cylinder and other one looks like would be for CH nest to the pump.
I would appreciate if you could point me in the right direction if possible.
Thank you and whish Merry Christmas.
Patryk
Cheers man, Im not a plumber but II have to replace 3 leaking rads and valves at home during covid lockdown. No chance of getting plumber until new year so this has helped me out greatly to understand the system. Whats the worst that could go wrong 🤣🤣🤣🤣
Thank You
Hi, Where would you connect the power flush machine on 2 pipe system to flush radiatiors? is it at the pump or the return on radiator?
Thank u
Great vid thanks pal
Thank you so much.
more theory stuff would be awesome. thanks mate
Which subjects would help you best. Thanks.
@@AllenHart999 I'm not even sure I've just started out as a mate so looking at everything. Whatever is good for beginners I suppose. Thanks
@@eazyrat Ok , Will add some when possible. Thanks.
Awesome mate just what I need. Cheers
BRILLIANT!!!
Thank you.
Yes I found it useful that you.
Thank you
Thank you for taking the time to watch my video.
Hi Allen can check valves slow the pressure of water to a point where there is no water
Best videos out there at the moment very clear and knowledgeable ' wish I had you as my college tutor ' do you have more info on expansion vessels ?
How can I help you?
In one of your vids I noticed some info on adding an expansion vessel to make it a sealed system was just wondering how do you calculate size of vessel required for the size of the system ?
Many thanks Allen
Do those zone valves open and close based on the programmer? I have a Honeywell programmer and electrical leads come from the valve to the programmer so assume so. I assume when the programmer ticks on, the valve gets an instruction to open? Another question is when, say, the thermostat ticks the heating off, yet the programmer is still on, does the valve stay open? Or does it close and go on bypass because the pump runs for about 30 seconds even after the thermostat has ticked off? Also, the pump sometimes runs for 30 seconds or so after the programmer has clicked off? So, does the valve open and shut based on the programmer alone or the thermostat as well? I also understand the bypass is an emergency incase the electronic valve fails. I also understand it's auto that's best to stop the bypass loop running all the time. Thanks.
Ok, if I have a logic combi, without hot water tank, just radiators, surely that means I can switch off gas and connect a wood stove and the boiler will circulate the hot water?
Hi mate which one is best wireless thermostat for valiant system boiler ? Thanks
Great video, only one I found getting close to explain gravity system properly, still one question though - now you need to have fully pumped system if you change Hot water Cylinder, how complicated is that? can I keep all old piping and 1987 Ideal Mexico Super CF 125 that works well? Do I just add another pump somewhere, minor pipe work and keep the two tanks on the loft? Problem is rust colored water overflow into &e tank, that is all I want to get rid of, ball valve checked and not faulty
Thank You
Half way through my level 2 plumbing course (full time) so not getting site experience. Videos like this are really really helpful! I would of preferred each section as individual films so I can look back at each part easily.... rather than one long video.
I will do some short videos in the future. Thanks for watching.
I am currently failing my level 2 course
@@jackieb8738 did you fail?
Good video lad
Thank You
cheers Alan
Happy to help, Thank you very much for watching.
thanks for this good man
Thank You
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Alan I’ve just come across this video and it’s something I’ve been looking for. Question I have is do you know of or even maybe sell yourself any literature that breaks down and fully explains the different systems, how to identify them?
Thank You
Hi Allen, The flue heat recovery system, would this only work on hot water only, would it be more or less point less when using continuous central heating. Thanks Allen for your informative lectures.
Thank You
I've been thinking.... Can you make it to use ice cold water instead of hot water? I need to cool down in the summer time...🤔
Great vid.
Any chance you doing one on unvented cylinders?
Cheers!
I will try , Thanks for watching.
Just for you ruclips.net/video/VKtxentcino/видео.html
Hello Allen ! All your work is amaizing and the way wich you explain the things ! I wish to meet you on the roods for a photo and a autograph ! All the best Allen
Thank You
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in a5 bedroom house 2 bath room 2 shower witch is the best system you can have thanks.
hi Allen great video correct me if Im wrong but you can drain the radiators down via the return on the filling loop
Thank You
Yes sometimes, Depends how its installed. Thanks.
sorry allen what amen is direct system or indirect or a combination boiler thanks a gain.
Hi Allen great video again.
Just wondering if you could explain how a room stat, external programner and fused spur are linked togther and how the wiring works. Just cant get my head round the electrical side of it, ive only ever had to connect to a 3 pin plug to only test it as we've always had a electrican follow behind us the next day to hard wite all the controls . I would be very greatfull for your time. Thanks
abdul hafiz do a search on John Ward heating wiring great videos
@@heatservicebwcuk1545 thanks! his videos seem to explain it very clearly
abdul hafiz your welcome mate.
Thank You
Thankyou
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Does the gravity system normally have a heat exchanger in the hot water tank and rust inhibitor in the boiler/radiator system or is it all hot water (untreated drinking water) through both tank and radiators. ?
Thank You
i have this system in my new house, however the water temperature is far too hot. I suspect its the boiler thermostat but i can hear it clicking when i turn it.
How hot should the water be?
The boiler is as old as me, i am palnning on replacing it but not at the moment.. Any advice would be appreciated..
Thank You
Could you show a video connecting the central heating and c/h Feed from boiler ? Would be much appreciated
Thank You
Hi I have an old system like the 1st you describe and when I turn on the heat it heats the rads and the hot water tank at the same time. When I shut off the hot water tank via the valve in airing cupboard to just heat the radiators and not the water I get a constant steamy flow into the attic small overflow tank which then drips outside from the eaves. So basically I have to heat the hot water tank everytime I need heat in the house. This seems a waste and was wondering if you could help.
Thank You
Hi Allen Hart. I have the "s" system that you describe here. Due to increasing family demands I need to add a bathroom to our home, but would need to increase the size of my header tank and add another indirect hot water cylinder. I have very good mains pressure and a Stuart Turner "Monsoon" pump on the hot water supply. Can you help me to understand what I would need to do to create a working system that would deliver the increased supply that I need. (connection-wise hopefully) I have one 1200 x 400 cylinder at the moment and was thinking I would add something similar to alleviate the problem.
I realise that you have no exact dimensional information, but hopefully this would not stop you being able to offer some advice or point me in the right direction. There are a lot of conflicting opinions online.
Thank You
What would happen if a radiator was in a fire that heated it? Would the boiler think it didn't need gas and circulate the water?
What would cause the explanation tank to heat from its feed outlet
great explanation is the old boiler still legal now days or not enjoyed the video.
Thank You
Allen, can I ask you. Does the pump also have to be within that 150 mm. So you have two pipes and a pump within 6 inches ! Thanks. Or is it just the two pipes and the pump can be a ways down stream ?
Thats a good question. We were always told as close as possible. I cannot remember ever seeing a figure for it. Maybe someone could correct me if they know the answer. Thanks.
@@AllenHart999 Thanks Allen.
I wrote all your lecture and all I’ve learnt by heart Vary helpful please if. You can make boiler fault finding from A to Z I’ll will be obliged
I've just started a gas course love learning off this guy well done 👏 , while im here im trying to find a engineer to shadow for portfolio anyone with any info on anybody that would like some cheap labour while I gain my qualification or any other way as I feel im going to put all energy in and hit a brick wall when it comes to completing my portfolio, im in the nottingham area I can travel, anybody with any advice for a fellow man would be much appreciated. 😊🤞
Thanks
Allen, why does the open vent and cold feed have to be within 150mm of each other. If this was greater what would be the outcome.
Thanks
To keep the negative pressure as small as possible. We wouldn’t want the system sucking air in. Thanks..
Allen Hart Thanks Allen
@@dave8930 No problem. Thank you for watching. 👍
Some manufacturers actually wanted the cold feed dipped before connecting
Does the gravity system work with pumps along the pipe network? What happens if there is electric power outage? Would liquid in the pipes manage through the pumps?
Gravity hot water doesn’t use a pump no.
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@@AllenHart999 Sure it doesn't. But the pump is in the liquid network. How the liquid manages through the pump? Shouldn't there be a some bypassing of the pump?
How to get OpenTherm on System Boiler?
Allen. Was was watching one of your other vids, where you upgrade a Y plan to S plan, where you combine the vent and cold feed. How close would you combine the two together, to the header tank.. do they have to be close to the tank? is there a certain distance frm the header these have to be connected? or doesn’t this really matter! Thanks for the vids Allen 👍
@pmailkeey Currently there is an open vented, heat only system, no zone valves Jst a boiler, timer and pump, I’m looking at upgrading the boiler and pump. 22mm vent and 15mm feed installed in the correct fashion as you say. Was Jst wondering if there was anything I should consider if combining vent/cold feed pipes. Not a lot of info out there on this method of installation, Jst something I wanted to consider if this job goes tits up, eg if it starts draw in air etc.. Its an old system, reason why I’m not going to seal it! Looks straight forward enough! Thanks for you input 👍
whats the ring bound book called you have ?
I cannot remember tbh, Sorry
Missing in the first system the hot water tank has a heat exchanger pipe coil for the boiler water. This keeps the chemical inhibitor in the boiler/radiator water out of the hot tap water.
Thanks for pointing it out, I always miss something 🙀👍
Hi Allen, can you tell me why a bypass is only needed on the s plan system and not the y plan?
On a three way diverter valve its always open to hot water,never fully closes whereas on the s plan both valves could close resulting in kettling as the boiler cant dissipate the heat
Thank You
@@thomaswatt1658 Thank You
I use S plan, it can keep both radiators and hot water warm at the same time. I recommend it instead of Y plan or even worse a combi because they turn off your radiators when hot water is used. Why plumb like that, in winter your rads turn off whenever someone or a machine uses hot water.
Do you fit many open vent systems then Alan
Mate?
Not if i can help it. The odd one.
Hi, at 10:30 the diagram shows the cold feed going to the flow pipe, is that wrong? I thought the cold feed from the FE tank was supposed to tee into the return?
Or is it different because the system uses a pump?
Another quick question, what are primary and secondary flow/returns?
If I pass my exam tomorrow thank you
Thank You
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lets say they have a lot of plants rooms and the building secure and you can get out figure it out lol and a lot of pigeons
Thank You
4 weeks later I landed my dream job 30000 as an apprentice plus 2000 for on call and overtime and the job is a walk in the park
That’s amazing news. Is it with BG?
Video of converting system to combi some time soon 🤞🏽👍🏽
Nishnu TV I will do that as soon as I get chance 👍
👍🤓👍
Thank you. Hope you are well. 👍
How to top up water in gravity boiler system
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Top man! Fucking brilliant.
Thanks
Very good
Allen ....your initial diagram showed a boiler connected to a direct hot water cylinder where the system open vent was that from the hot water draw off, and the cold feed also fed the heating what you sketched was an indirect system but then in your additional explanation you didn’t draw a coil in the cylinder but you took an open vent to F&E tank from the primary flow, which you explained was for a expansion.,this is not so it’s function is only an open vent. You also draw a feed back to primary return and in fact this feed is the “feed and expansion” .. but it’s very important with doing this that the cylinder is indirect by virtue of a heat coil not a direct cyl !!!! Just ... pointing it out as I know you would like to be spot on and do the job correctly
ruclips.net/video/9tVVM758tdo/видео.html
Some time stamps would be great touch
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