What exactly is a sealed boiler case

[bernardgreen]

DISCLAMER

I am not suggesting opening the casing is acceptable but I am looking for the logic behind the regulation,

"" Opening the case on that boiler forms part of the combustion circuit and needs to be checked for safe operation afterwards ""

Comments similar to this are posted many times on DIYnot,

A similar statement made by a gas engineer about a boiler where the underside of the boiler is not sealed airtight. An electrician needed access to the terminals inside the "sealed" casing to replace cables. He was told to leave the boiler switched OFF ( fuse in FCU removed ) until the gas engineer could visit to check the combustion was correct.


Surely in appliances with a sealed combustion circuit opening the casing will not significantly affect the combustion circuit.

 

[cross thread]

So what if the case was not fitted correctly and a combustion seal etc was faulty ? Surely the products could leak into the room .

 

[just pumps]

Would a spark know if the seal was damaged and likely to leak.

 

[bernardgreen]

I am thinking about appliances where there are gaps / holes in the base of the boiler so even when the panels of the casing are correctly fitted the casing is far from being air tight.

 

[just pumps]

I am thinking about appliances where there are gaps / holes in the base of the boiler so even when the panels of the casing are correctly fitted the casing is far from being air tight.

Then it is not part of the combustion chamber.

 

[bernardgreen]

Then it is not part of the combustion chamber.

In which case would it be necessary to not use the appliance until a GasSafe technician had measured the products of combustion ?

 

[just pumps]

In which case would it be necessary to not use the appliance until a GasSafe technician had measured the products of combustion ?

You said that you were "looking for the logic", you have been given the logic.

Not sure where you are now taking this so, Im out.

 

[bernardgreen]

you have been given the logic

Hopefully the logic will reach and be understood by those who believe a panel with holes can be part of an air or gas tight casing.

 

[ianmcd]

Not all boilers are room sealed by the outer casing that you refer to , some will operate safely if the outer casing is not sealed properly, but not all

 

[bernardgreen]

Thank you Ian, your confirmation is welcome

 

[Razor900]

Exactly in most cases the outer casing is just a plenum chamber but as Ian points out there are still some positive pressure cased boilers around that could be really dangerous if the outer case is corroded or altered.

To be fair it's yet another grey area where regs aren't properly explained...