HOW TO DRAIN YOUR HEATING SYSTEM – Pressurised – PLUMBING TIPS

https://youtube.com/watch?v=_diB6LmlVq0

This video covers the basics of draining down your heating system to fix leaks, change radiators and move boilers etc. It covers isolating the water supply, venting the system, how to find your drain offs and radiator drop down legs, re filling the system, venting of air and inhibiting.

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This switch here turns it off, alright? That's the heating system off. We don't want it coming on or anything like that while we're draining down. The last thing we want is the boiler lighting up, or the pump coming on. It could burn the pump out, it could overheat the boiler and crack the sections. So the first thing you do is make sure that the heating system is switched off. "Ah, but James," I hear you ask in your stupid voice. "How does that pressurised heating system work?" "Well, y'know, I need a basic knowledge of them to know how to drain one down." Well, usually, you've got your boiler, your pump, any valves: you could either have a three-port valve there or a couple of two-ports. In this system, we've got two two-port valves.

Then you're going have your coil going into your cylinder, if you've got one; if not, a combi system. Then also you're going have your radiators, blah, back to the boiler, blah, back to the boiler. Now, some heating systems use a gravity feed in the loft to actually push water down, via gravity, from a tank up there with a ball valve in it down into the system. But nah, we don't have that on a pressurised system. 'Cos we ledges, aren't we? Yeah. Basically we have a cold water main come in, comes in, goes through a filling loop into what we call the manifold that's often at the bottom of the expansion vessel, So we've a big expansion vessel like that. So you got that, filling loop, braided hose. You have a non-return valve there, a valve there. This braided hose is removable, so the system doesn't automatically or accidentally fill up off the cold water main, which could pressurise it, which could bulge radiators, which could cause your whole world to come falling down. So yeah, there we go. That's the basic gist of how they work.

The water heats up, expands into this expansion vessel. Like I said already, go to our video on pressurised systems. So, let's have a look at this system here. So here's the loft that we're looking at and the particular part we're going be taking notice of is that bit there. So here we are on the lines down of possibly, possibly the worst pressurised heating system install I've ever seen. Right, so, we've got our feed from the cold main here. That's this valve here, we've got our braided hose here, that's also got a little valve in it that you can't see, but it's just a little black-handled valve. Let's get round here and have a little look. Can you see that? There it is. Now that braided hose comes up here and through this, which is a non-return valve, That means the heating water can't push back down the mains if there's any problems like that.

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