Who can tell me what these are for?

[leakydave]

I am changing an old oil boiler in an S plan heating system.

These two objects are fitted close to the boiler... what do they do?

Dave

Untitled

• leakydave
• 17 Dec 2012
• 1

 

[cozzmic]

Look like the same type of pressure sensors on domestic water pumped systems. I would hazard that the are under and over pressure sensors to cut out something.

 

[Boilerman2]

Yuo clearly have a Sealed system those are Teddington Pressure Switches for High / Low pressure shut down

The High Switch should be set approx 0.2 bar below the PRV blow pressure (Differential "min")

The Low switch should be set at approx 0.5 bar (Differential "min")

The switches will be wired to shut down the Burner and possibly pumps if the pressure is too low or high.

 

[leakydave]

Oh thank you. They are on a sealed system yes. The original 'filling loop' was a hosepipe from the outside tap to a drain off cock!

The BIG question then... Do I need to keep the pressure switches or can I take them out?

 

[leakydave]

tum tee tum

 

[leakydave]

Oops

 

[buck51]

If you need to ask, Then I dont think you should be doing this job.

 

[xr4x4]

You need to check if the boiler has got this system built in.

 

[leakydave]

Sorry buck51, I just haven't seen these before. I have fitted loads of boilers and all ok, just not seen these before.

I always believe in asking I don't know an answer, we can't always be as clever as you.

 

[Dan Robinson]

Why are you not asking these sorts of questions in the combustion chamber then?

 

[leakydave]

They don't let oil heads like me in that exclusice club

 

[Dan Robinson]

I'll get me coat .

 

[Agile]

Dave, they are on the heating circuit are they?

That kind of pressure switch can also be used on a pump and accumulator as could be used on a borehole water supply.

 

[leakydave]

They are on the heating circuit.

 

[Agile]

They would often be used with a pressure pump controlled by the switch to automatically represssurise the system.