Low Presssure showing

dp639

Hi,
I had to remove a radiator on the weekend as it was coming from the wall after a few kids decided to sit on it.


Got the radiator reattached and refitted and bled out the air.


Checked the pressure gauge in the hot press and it is showing just under 0.5 bar, down from 1 bar or so.


I'm OK DIY wise but when it comes to plumbing issues I would usually get a plumber so that was the plan, for me to the do the refit and get a plumber out to bleed or re-pressurize the system.


But since we're in this lockdown I was hoping that maybe this is something I could do. How do I go about adding pressure to the system?


Is the picture attached related to this, or if there is anything else I need to add before someone can answer me, then just let me know and I'll take whatever photos, etc that is needed.


Many thanks for reading.

greasepalm

When i got a new gas boiler fitted upstairs there is a pressure gauge above it and one in hot press.The mains cold water pressure to tank in roof has a splitter with 2 levers for switching on water to top up heating and switch off just under 2 bar.Every now and again it needs a top up if there is a leak.Dont think your photo shows correct ones for topping up your system,any others from a 1/2 pipe?

https://www.google.com/search?client=firefox-b-d&q=how+to+top+up+central+heating+system+with+water#kpvalbx=_-ga0XpibCqWu1fAPqoyqwAE34

Idioteque

What you're looking for is called a 'filling loop' and as mentioned by the previous poster it comes from your mains water. Essentially the high pressure of mains water increases the pressure of your closed lower pressure heating system.

So what you're looking for is a connection (usually a braided flexi pipe) between a mains water pipe and your heating system (often in the hot press). There will be a valve to allow the mains water in, so you'd usually have someone else watching the boiler gauge as it rises - open it slowly as it can rise quite fast. Don't worry if you over-pressurise as all you need to do is bleed a rad again and it'll lower.

The filling loops are not meant to be left connected so you may not have one connected but it seems many are left connected with just the valve as a safeguard.

greasepalm

Strange thing mine is soldered in and not removable.

rightjob!

Do you have a pressurised hot water cylinder??!
That 6bar safety valve is blanked off, extremely dangerous!

greasepalm

Ahh that would explain the funny ends on pipes as must be pressure release valves cheers.

Wearb

rightjob! wrote: »

Do you have a pressurised hot water cylinder??!
That 6bar safety valve is blanked off, extremely dangerous!

Unless there is another one on the same system (or a piss take) extremely dangerous is almost an understatement. Turn it all off until you get that valve sorted.

dp639

Idioteque wrote: »

What you're looking for is called a 'filling loop' and as mentioned by the previous poster it comes from your mains water. Essentially the high pressure of mains water increases the pressure of your closed lower pressure heating system.

So what you're looking for is a connection (usually a braided flexi pipe) between a mains water pipe and your heating system (often in the hot press). There will be a valve to allow the mains water in, so you'd usually have someone else watching the boiler gauge as it rises - open it slowly as it can rise quite fast. Don't worry if you over-pressurise as all you need to do is bleed a rad again and it'll lower.

The filling loops are not meant to be left connected so you may not have one connected but it seems many are left connected with just the valve as a safeguard.

Thanks, found that and now it is reading 1 bar, I assume this is correct, as opening the flexi pipe again does not increase the pressure any higher.

greasepalm

Water pressure if low will have a bearing with trying to pressurize system.