Air vent valve added to gravity fed heating system - not sure why

[dr_bogenbroom]

I had a power flush and some zones added to my gravity fed CH system - I later discovered they had disconnected the vent pipe and added the below valve, any idea why? I’ve had to bleed the radiators a few times since they left.

I also need to replace a faulty TRV and was planning to just bung the system but not sure if that would work in this set up?

 

[cross thread]

Need photos of boiler and cold feed / pump / valves set up

 

[dr_bogenbroom]

Need photos of boiler and cold feed / pump / valves set up

Ok will get today - when you say cold feed do you mean the feed to the CH system via the F&E tank?

 

[Johntheo5]

Ok will get today - when you say cold feed do you mean the feed to the CH system via the F&E tank?

What you may have (now) is a combined vent and cold feed, in effect no vent, allowed only (by regs, I think) if the cold feed is 22mm or more with no isolation valve(s), It does work but generally a pain when refilling to get rid of the air.
Thats probably a manual bottle vent on the "vent" pipe now.

You may have been getting vent pump over with the old system, ask them why it was changed.

 

[dr_bogenbroom]

In the last picture the cold feed is the 15mm pipe to the left of the new air valve - it connects to the coil feed at the bottom of the cylinder. The air valve and zone valve is connected to the coil feed coming out in the middle.

 

[dr_bogenbroom]

Oh and to add it’s an oil fired heating system not gas.

 

[cross thread]

It’s wrong, on a single vent and feed , if allowed by the manufacturer must follow their guidelines

 

[dr_bogenbroom]

It’s wrong, on a single vent and feed , if allowed by the manufacturer must follow their guidelines

So you’re saying this has been set up wrong?

 

[SithLordHood]

I thought all pipe and connections within 2m of the boiler needed to be soldered copper, looks like you have a push-fit and a compression joint too..

 

[dr_bogenbroom]

I thought all pipe and connections within 2m of the boiler needed to be soldered copper, looks like you have a push-fit and a compression joint too..

Boiler is downstairs in the garage