Bypass question

[Nixt]

There is generally no pump overrun on oil boilers (except combis) pump stops, boiler stops. The residual heat should not send boiler to high limit unless fault on appliance or system - see MI's. Check control stat phial is properly in it's pocket.

 

[MickyP10]

There is generally no pump overrun on oil boilers (except combis) pump stops, boiler stops. The residual heat should not send boiler to high limit unless fault on appliance or system - see MI's. Check control stat phial is properly in it's pocket.

Hi Nixt

Thanks for your reply but I think I've reached the limit of my limited knowledge. Looking at an exploded parts diagram ofthe burner I can't see what you mean. And having done a visual on the boiler, the thermostat connection is a coiled piece of wire that's sitting in the top of the boiler. Is this what you meant? If so, it's in place.

How do you set the manual bypass? Fully in and a turn out or is there a more accurate way, like measuring temps of boiler input/output? Just curious, as Ive convinced myself this is most of the problem.

Sorry for being dumb...

 

[esra_ptrap]

As was said earlier it depends on your system config but, in the main, with most combis where the bypass is fitted in the CH system between flow and return (not internal to the boiler) if there is at least one radiator permanently open i.e. no TRV's and both lockshields open sufficiently to maintain minimum recommended flow from the boiler you do not need an additional bypass FROM A TECHNICAL PERSPECTIVE.

It's always a good idea to have an automatic one though in case some numpty (or new house owner etc) closes the lockshields on the radiator, fits TRV's or removes it completely

 

[MickyP10]

Thank you

 

[Bigburn]

Heating controls are not a sparks field.