Balacing tube in boiler?

[jhaws]

Does anyone remember those balacing tube's (plastic tube's like an APS tube) that went from the gas valve to the air opening (point) inside the boiler casing?

I was changing a pump head today in my Ferroli Falcon boiler (very old) and noticed it!

What exactly is it for/does it do? I can't think and would like to know if anyone could help?

Thanks for any help, James

 

[Agile]

The gas valve needs to present a preset and stabilised pressure to the burner. In a simple world this would be referenced against atmospheric pressure.

In a boiler this presure needs to be referenced to the pressure inside the combustion chamber. This can vary negatively according to the length of flue pipe etc.

So the gas valve takes the reference pressure from inside the combustion chamber.

No DIYer should be getting involved with gas or burner pressures and should not even open the combustion chamber!

Tony Glazier

 

[jhaws]

thanks for the info/advice Tony.

The pump head is not in the combustion chamber I just say the tube running from the gas valve up to the combustion chamber.

How comes some boilersd have this balancing tube and a lot do not then?

 

[Agile]

Many older boilers had them but most later ones dont.

I can only think that they realised they were not really needed and saved 50p on the manufacture costs.

In any case a proper engineer will set up the boiler individually on a service.

 

[johnnojob]

believe tony he is the expert.
tony,i was lucky at the over 50,s nite and pulled for both of us,yours is very sleepy probaly due to her age but a good runner after some sanatogen wine.