CENTRAL HEATING SYSTEMS – Gravity – Fully Pumped – Combi – Y Plan – S Plan

My name’s Allen Hart today I wanted to do a video about central heating systems different types of systems of gravity hot water systems fully pumped systems and then combination systems as well I’m going to try out a few different types of boilers in as well so we’ve got combi boiler here this is this this company by there’s actually got a flu recovery system on top also look at standard common Bay look at how our cylinders maybe look at some warm air as well so a little bit system design and a little bit of boilers just just a bit of a mix really so so let’s let’s go a lot down going back in time to McGee’s as an apprentice really floor standing while standing boilers up and float a lot of the time these boilers was gravity gravity hot water pumped heating so what you’d normally find is you’d find a couple of pipes there like that the micro mount this side all outside and they could be namitha being 28 mil and they would go up to a cylinder upstairs and they would just work on grubber so house what gets hot water rises goes up sits cylinder and then comes back down when it’s cool ticks quite a long time 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 I’ll show you I mean what you a lot of time what you found with these as well as you might find that the pumps inside the boiler or the pump might be under the floor near the boiler as well and the pump before the central eating part of the system so we’ll have a quick look now I’ll do a little drawing and I’ll show you about that and then we’ll move on to looking the update version thing of when we went on to a fully pumped system so we are dest plans and my plan so we’ll have a look at that then as well so what’s a lock now this is a gravity hot water system in the most basic farm so we’re at the moment here we haven’t go in a heating connected 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 and then as it cools down it would come back out and back to the boiler and that there’s no pump on that and that just works on gravity and how light is controlled is the there’s only the temperature control on the boiler so when the boiler gets up to temperature it’ll shut off so the control is it’s not great but that’s your basic diagram and then this side of it that’s you you cold water storage tank and then you have your cold work going into you cylinder and your hot water coming out to the towers and then for the heating system we would have two more pipes on here and you would have a pompom and then that would pump around the heating sure I’ll show you I’ll show you a date going now of this now with a with a pump on it and then we can we can see how that would work as well sorry about the drawing it’s not it’s not perfect but if we’re imagine that is the boiler if we was gonna up the heating now on to this without to over pipes so this one would be the floor and that would be the return what you’d often find is the pump would actually be on the return back into the boiler and then this would go around your heating system and you’d have your radios on there could also be a wall pipe system as well sometimes and that’s how that would and that would fill so to get water into this system normally you would have from from them pants they’re going up in your hair in covered you’d have a pipe going off there that would be an expansion pie and that going to a centrally in head of tank and then you’d have off there you would have a cold feed and that’s how you’d get water into gravity part of

the heating system and then that would fill the heating via the boiler so if we had a wool pipe system connected onto this boiler we’d have a floor and it would go all the way around the circuit and back to the boiler and off that pipe these would just have teas and then would be connected underneath maybe under flower so it would always be one continuous circuit obviously these are not going to work as well because they’re only going to go into the earlier via gravity so for instance if you want 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 so that’s just a basic diagram of our one pipe system would work and I’ll show you a two pipe system as well so again apologize for the poor quality drawing but this is the two pipe system just a basic three runs on this there so you’ve got your flow again and then it’s two pipes so you’ve got flow and return there outside of each other and when it goes into it ready as you’ve got the floor the goes into ready air and then you’ve got a return that comes out ready air that then goes but sat boiler so if you shook all the rest of the radio is off and you just got one ready around then the pump will be flowing through that one radiator so for instance if you want it to do a power flush you could show your radios off connect your power flush machine in and flush that one radiator and then you can open the next radiator starts off lost that ready to close the previous really it off and and and and yeah so he bits a fluster system better this is obviously a much better designed because you can balance these read it as as well so you can balance the floor around the system so the the radio a closes to the to the pump pot on the floor you mere balance this down so it’s only got a little bit of flow going through it and then the one furthest to where you might have that more open to allow the heat to get to that one so that’s just a basic two pipe heating design I’m now going to look at heating systems that’s got zone valves on and diverter valves I’m going to talk a little bit about diverter valves tongues and valves and how they would be piped in to a system as well so we’ve got a hot water cylinder here so normally that built Aaron covered we’ve got pom-pom on system here and then we’ve got zone valve on here as well so what I’m going to do I’m going to do smart drawings and I’ll show you different different ways of piping weaves or valves and with controls and also what the different valves do and which way the floor goes into the valves etc yeah so let’s look at that now so when we have a look on a zone valve often will see an hour–the so we know which where around the valve needs to go so obviously the water would be pumping this way sometimes you’ll have an air and a B on them and normally the air would be there and the B would be there so again you’d be pumping towards that way when we look at standard freeway valve so diverter valve we have an A and B we have an air and then we have a B so a and B is the floor from the boiler and then you’ve got air yeah I also remember air for air and then B b4 buff so here for the central heating and be full of hot water cylinder so you flow up you’re calling for hot water it’ll go this way and they’ll go around the hot water

cylinder if you call in for heating they’ll go that way and I’ll go around the central heating circuit if you had an open vent heating system eww floor coming up from your boiler and then you’d need an expansion and you need a cold feed and then you W pump and then you pump that she flow and that would go to the vowels so if it was an S plan on a Y plan that would then go to to them valves so points to remember then 50 Marcus Imam and these need to be behind the pump and then you’ve got this is for the backseat by Allah so it’s got a minimum head of Y I so you’d have to check in installation instructions for that and then you’ve got your expansion pipe normally minimum that would be 450 so I apologize again for the poor drawing so what we’ve got here we’ve got his header tank for us heating this pipe here is the expansion pipe from the water level layer so that pipe we want a minimum of 450 ml and then we’ve got us cold feed and when we go down here they need to be within 150 ml of each other so how I remember this is of course EP so I’ll say P so open vent the cold feed pump and then to the control valves whichever type of valve we’re gonna be using and then if we follow that on onto a white plan which I was pumped put pigs Awards a and b b b goes to a war so be for bath and a if rats so that’s how are you would pipe so that’s for your wide plan if we look at an s-1 system so the Esper of it still the same so we’ll start from the pump and we’ve got to watch so these are zone valves now so a debate so that’s just hot water and then that way would go to the radiators so that would be when you see two zombo’s in like an airing cupboard that would be a next plan what he’d also need on this he’d also need a bypass so before the zone valves you’d need to pipe that then goes back to the return on the heating on the heating system or on the the main return because what what could happen is if if this valve here closed so the the rubs are now up to temperature and if the hot water is now up to temperature the pump would have nowhere to pump so you would you would need a bypass sometimes you’ll see like a gate valve on these and then sometimes you’ll see an otter by bus we were dark normally we’d want an answer by bus so I’d love to grab a say heating systems a little bit we’ve also looked at s plums and white bones up and then systems there’s lots of different types of systems so you can also have seen systems if you have a sealed system you don’t know how to tank and then you’d have a filling loop where you fill the system up normally they would be on like a combi style system so you can have a normal standard boiler on a sealing system you’d have to check the manufacturer’s instructions but what I’ll do is we’ll move on to combi boilers and I’ll show you a sealed system on a combi boiler and then that just gives you an idea of this so I’m just doing a few different beautiful things there’s many many different types of of heating design and systems there were there were n plans and C plans and any plans and all sorts of different plans Academy but to be honest because I’ve never I’ve never fade any other types of systems so yeah so now what we’ll do is well I bought a condo boiler and our combi boiler system would work so let’s go look at one now so if we

look at a combi a comedy boiler system then it’s it’s so much more simple because it’s all built into box really so you’ve got white box on wall and it’s all built inside so you’ve still got a diverter valve inside you’ve still got a pump instead of ahead of time cube nomicon expunction vessel so we can have a look at that and then when you look on anomaly that I would pressure gauge so it’s got expansion vessel inside and then what we need to do we need to fill the system up so we need to manually fill a combi boiler of our sealed system with manual a solar system so we’re normally our filling look below so well I will have come to Neath now I’ll show you bottom-up boiler here and then we can see what the pipes do so we’ll have a lot now so when we look at combi boiler what we normally have will have a floor pipe so if we imagine on the normal y plan system that has already come through you y plan and that’s now going into the radiators this pipe here is the hot water so that if you imagine you have water cylinder that would be what came out of the top of the hot water cylinder on this one we’ve got the cold the cold pipe is there so that’s the cold means so the cold means is going that we’re into the boiler and then the hot is going that way out of the boiler and then we’ve got the return pipe so the floor is going that way and that’s feeding the heating system and then then we’ve got the return and the return is going back so that’s going back into the boiler so we’ve got us cold means here instead of having the header tank up in the loft we’re going to manually fill the system instead so that’s cold water comes in it goes around the filling loop and it goes into the heating system so then chill valves at the moment above turned in the off position but if we turn them first in the pipe work then we would be filling the heating system and we’d normally fill this to around 1 bar and I’ll just I’ll show you the I’ll show you the age on the front of the viola now so this is the pressure gauge on the boiler also some boilers will have a display on the front which this has and that will also read the pressure for you to fill up so what this has instead of having a header tank up in the loft we have an expansion vessel that’s built inside the boiler so this is a white box that contains all the components so it’s got an expansion vessel it’s got pump it’s got a diverter valve it’s got the heat exchanger and it’s all in it’s just in one box so it just makes it nice and easy to install one thing I farted sure you all this filling loop is this has got a non-return valve in here so the one the this the wall of the number turn valve goes on the cold so what we what we wanted to do is we don’t want centrally it wants her to go back into the cold med so I always make sure you put these on the right way around and also then when you come later to top of the expansion vessel during the system down you can do it from this valve so it makes it so much easier most combi boilers work in the same way so you’ve got the pump people a diverter valve that diverts it rather to the heating system of solar hot water in a combi boiler on a player heat exchanger which separates it and that separates so it’s water to water so one side water on other sides water and it’s got a mouth flare in between that allows that mexic so the heating water doesn’t mix with the hot water that’s going to come out now this is a little bit of an exception to the rule so this this is God built a flu recovery so there’s there’s a few boilers on the market that have that Velen have wound Johnson and Starr they have one attack it’s act they have they have what as well they can’t come on as economizer yeah so how flu recovery works the cold water comes in and it goes

round the flu so if you imagine when when you when you buy this on and yet you flue gases go up from your flu that’s the warm so what flu here recovery system does is the cold war will go round the flu in a now ever they decided to do it will then go back to the boiler but it’s warmer so one it’s gonna reduce your bills because you don’t have to heat the water requires quite as much the really good it’s a good it’s a good idea and it’s a good design but the number too expensive so they’re not really calm too much just get that they are the future and believe in all honesty but we’ll sit we’ll see see how that girls yeah I think that’s it really and I think well do is I’ll show you I’ll show you a warm hair a warmer bottler so it’s not really essentially designed but it’s old old school really I used to do well of warm air many many years ago so I’ll show you a warm air boiler and just you just an example really of all that words are an idea of how that works so let’s go and look at what we’re boiler now it’s a Johnson’s dour wall mer unit so there’s a high spec j25 if we look at this this is an open flow version and look and look at this just don’t look inside at the top here that’s like yeah he filter but we’ve got fun there and then that fun in there there’s narrowed down there though if you can see that I wrong so that I don’t know if that’s blowing wow that’s blowing down there so subtly blowing hold and that goes over the burner so I’ll show you that bit now took yourself when we look inside we’ve got I’ve got gas valve this is for the warmer so this side of it is for the warmer there and then if your other side here that that’s a is for the hot water it’s also got the gas stove on that as well I’m actually what someone of these four must be 15 years or so so I do apologize if if I get mixed up at all with any of this but what you’ve got here is I believe that this is where the heat would come out work on the bottom and you would have still like a floor mat oh really and then you never return here the returned don’t wait go back in it could be all the way around but as I said cameraman but I’d have to read instructions but I just wanted to just give you just to give you a look at really yeah so yeah so that’s sure what she won’t marry you man so that’s my attempt on video about central heating system design I hope you found it useful thank you for watching