[Help] How To Top Up Condensing Boiler Pressure?

Domicio · 30-11-2021 04:50PM #1

Hi all, I'm having a hard time to top up my condensing boiler pressure (ideal logic max s18 system boiler). it shows 0.5 bar when turned off and 1 bar when it's on.

I couldn't find where that I could connect the pipe to Increase the boiler pressure using a pipe.

Any Suggestion?

Please find below a couple of photos of my heating system. Happy to take more if needed.

Thanks in advance!

Wearb · 30-11-2021 04:56PM

Open that knob. That's an automatic fill valve and was probably set like this by installer.

Have you a problem with heating?

Domicio · 30-11-2021 05:03PM

https://www.boards.ie/discussion/comment/118246126#Comment_118246126

To be honest, that is what they told me when they installed it last year as well but the knob is fully opened and the pressure is still low (0.5 bar when it's off).

No problem with the heating system. Everything is working fine but I read that the minimum pressure should be at 1bar and not at 0.5.

Is that anything else that I could do? Thanks!

GreeBo · 30-11-2021 05:07PM

Whats in the attic above the filler pipe? Presume its a vented system, so should be small tank of water up there...maybe your tank is empty :)

Wearb · 30-11-2021 05:16PM

Hard to see the reason for automatic fill valve on a vented system.

Domicio · 30-11-2021 05:36PM

https://www.boards.ie/discussion/comment/118246183#Comment_118246183

I couldn't find any small tank of water in the attic. It looks like the water pipe is coming directly from the main Cold water storage

https://www.boards.ie/discussion/comment/118246233#Comment_118246233

May I ask if you have any other advice, Wearb?

Wearb · 30-11-2021 05:43PM

Yes. Leave it alone if its working.

Otherwise phone your annual service person to see if they know why its left at that pressure.

You could be opening a can of worms if you increase the pressure without knowing the reason why it's at that pressure.

Domicio · 02-12-2021 11:26AM

https://www.boards.ie/discussion/comment/118246381#Comment_118246381

I figured it out. The valve has been wrongly installed upside down. Therefore, when I thought I had it fully opened, in reality, I had it fully closed.

I opened that knob and now the pressure is 1.5 when it's on and 1 bar when the boiler is off.

Thanks once again!!

John.G · 02-12-2021 05:24PM

IMO, better off closing it again once you have topped up cold to 1.5bar as you will have no idea if you have any leaks or not, a tight system should only need top up once per year or longer.

Domicio · 02-12-2021 06:31PM

https://www.boards.ie/discussion/comment/118257748#Comment_118257748

thanks for your advise. I'll close it now.

Quick follow up question: I've adjust it to be 1.5bar when on and 1 bar when it's off. It is a condensing boiler. Should it be 1.5bar when it's cold and 2bar when on?

Cheers

John.G · 14-12-2021 10:20AM

!.5bar top up with a cold stopped boiler should result in a final pressure ~ 2.0bar/2.2 bar when hot.

[Help] How To Top Up Condensing Boiler Pressure?

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