rads not heating fully upstairs? not norm??

garythehat

Hello to all. I have a problem with radiators upstairs.

It is a zoned heating system. House is a few years old only. Firstly the boiler was airlocked from an empty oil tank. But i solved this from reading previous posts.

Now the problem is that I cant get the radiators upstairs to heat fully.

I have bled all rads and only a tiny hiss comes out. Downstairs air came out first, followed by water.

There is only one tank in attic. There is a red 12lt tank next to cylinder in hot press. It has a schrade valve on it. I have figured out this is the expansion tank.

I measured the pressure on it,this reads 0.85bar. There is a decal on expansion tank with a pump connected to expansion tank showing half air half water saying 1.5bar.

Does the problem lie here. What could i do?

aujopimur

You have a sealed heating system, there should be a filling loop or fill valve on the system, possibilly near the boiler or cylinder, use this to refill to 1.5 bar.
If it loses preasure on a regular basis the cause should be investigated and repaired.

garythehat

aujopimur wrote: »

You have a sealed heating system, there should be a filling loop or fill valve on the system, possibilly near the boiler or cylinder, use this to refill to 1.5 bar.
If it loses preasure on a regular basis the cause should be investigated and repaired.

Thanks for reply.

I have seen online videos etc that have filling loops. I could not see any.

Does this mean i recharge the expansion tank through the valve on it 1.5bar?

If so do i have to drop off water pressure on other side of diaphragm in tank or will it do just to pump air in up to 1.5bar?

tagoona

aujopimur wrote: »

You have a sealed heating system, there should be a filling loop or fill valve on the system, possibilly near the boiler or cylinder, use this to refill to 1.5 bar.
If it loses preasure on a regular basis the cause should be investigated and repaired.

Just as an aside, I also have one of these sealed heating systems that keeps losing pressure.
Is there anything I can investigate as to the cause of the loss of pressure, or do I have to bring in a plumber?

Jebs

First of all if you have air in the rads down stairs I would be worried, air will always rise to the top, possible leak downstairs, second it's an expansion vessel not tank"your red tank" get some leak sealer and put it into your system,

aujopimur

garythehat wrote: »

Thanks for reply.

I have seen online videos etc that have filling loops. I could not see any.

Does this mean i recharge the expansion tank through the valve on it 1.5bar?

If so do i have to drop off water pressure on other side of diaphragm in tank or will it do just to pump air in up to 1.5bar?[/QU

There has to be a filling device of some sort on your system, either a fill loop or a fill valve, have a good look around for something linking your mains water to the heating.

Jebs

It is possible that it is leaking from the safety valve on your boiler. You should see marks on the wall from the half inch pipe coming out. If not possible leak on heat exchanger,