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This video will tell you how to install an expansion vessel on a pressurised heating system. It doesn’t tell you the principles of a heating system though. Just how to install one.
Hold tight, and welcome to today’s Plumberparts.co.uk video.
I am in one of the hottest boiler rooms ever, and it’s only what, like, mid-April, whatever it is. I don’t even know. But it’s absolutely roasting in here and I don’t have my t-shirt, my Plumberparts t-shirt. So, I’ve gotta wear this, this lovely hoodie.
What we’re gonna look at today is how to fit a remote expansion vessel. Actually a few of you posted to us on Twitter and Facebook you’d seen a video by another guy on YouTube on how to fit one of these and you said it was awful. I don’t know who it was or anything,
but you asked me whether I could do one for you. So we’ve got a quick job here today.
It’s a large heating system, so we’ve got a 25 litre expansion vessel going in. It’s a system boiler with the expansion vessel in there is gone. We’re going to take that old expansion vessel out and bung it and we’re not going to put one in, back in the boiler. We’re actually just going to put one remote on the system. Now, the first thing you’ve got to remember is when you are choosing a place to actually put the new expansion vessel, try to put it where it’s not going to get in the way too much for a start because they are pretty big. Always put it in a place where it can’t be valved off. It has to be completely opened to the boiler and all of the system, okay? And also, try and keep it away from two-port-valves and places like that. Now, as I said, the system we’re working on today is quite a large one. We’re actually going to be putting in our expansion vessel on the return pipe from the underfloor heating manifold. What you need to do is find the return pipe, generally. Try and get that near the boiler, if you can. This is about a metre a bit away from the boiler room pipework. Then we’re going to clip it to the wall and we are basically gonna pipe it up, fill the system up, and get it going.
But before we do that, very quickly, this one here is pre-charged to 1.5 bar, which is what I’m going to leave it at. This one is actually from Screwfix. So, mental. If you want one of them, I’ll leave a link for you in the description below.
So, anyway, just watch me do it. There’s not going to be a lot of chatting, you know? It’s going to be one of them videos, and it’s so hot in here. And I’ve got a bit of indigestion ’cause I stayed up late last night watching the Masters. Anyway, let’s go! Hold tight!
This is a 3/4 female fitting to 15 mil compression. That seals out nicely, so that’s all ready to go. This is where I’m actually cutting into the system. So, we’re gonna cut in here, put a little reducer on it. We’ve got 22 mil, T here. We’ve got reducer going in there. And, what we’re gonna do, clip there, clip, clip, clip, clip. And we’re just gonna run up high, up here, along here, like that. And here is where we’re actually going to be putting in our new expansion vessel.
So, let’s go!
The secret to sexy pipework is mark your clips first then your pipework will just sit in them and look amazing. This is pipe number one. It’s tiny wee little set in the bottom because our cross pipe at the bottom sticks out a wee little bit further than our clips. A tiny bend there. Just that much. Tiny little bend on the end there. That’s just amazing. So, we’ve got that hung on the wall now, as you see. I hate those clips. Not a fan, never have been. So anyway, get piped up here now. Getting there nearly. Give all your fittings a good ol’ wash down now. Get all that flax off. Tighten up that compression fitting.
Don’t forget that. God, no. And there we go. Installed onto the system. T’d in just here. Clip, fit in over there, another clip, and up into our new expansion vessel.
Right, so there we go. We’re all done. We’re T’d in. It was amazing. I’m so happy. I’m about to fill the system up now. I’m going to fill it up cold to one bar and then I’m going to turn everything on and watch it rise up to 1 1/2 bar and then just sit there as it expands into this new expansion vessel. Obviously, this is not a description about how pressurised systems work or how you should fill and commission them. This is just purely about how to physically install a remote expansion vessel on the system. You shouldn’t really attempt to do anything like this if you don’t have a clue about what you’re doing. This is more technical than most standard plumbing tasks. I guess because, you know, you need to have a good knowledge of pressurised heating systems.