question about burner pressure

[plumberbd]

hi
i worked with a gas safe engineer as a trainee. once we went to sevice a boiler (potterton ff55). the label saying burner pressure (hot) 13.0mb. existing pressure was 8mb. my boss raised it to 12mb. i asked him the reason for raising the pressure but he never explained to me, he looked a bit confused. i dont work with him anymore. could anyone tell me please if he done it right. its still bugging me. thanks

 

[Hardy1]

thats strange, it should of been set at 13mbar exactly how data plate is asking for it.

 

[Puddle]

maybe he was superstitious ? :smiley2:

 

[mountainman]

Or the 'U' gauge was slightly underfilled and added both readings and divided by two.
Ps, don't try this on a digital manometer!

 

[yo1]

or they didn't have the correct inlet pressure

 

[mountainman]

Maybe it was a range rated boiler and the engineer adjusted the heat input precisely. Or maybe it was already set correctly and he felt the need to reset it for some reason.
The only way to be sure is to track the guy down and ask him!

 

[rawr]

maybe he confused himself with working pressure drop

 

[scorps]

maybe he wanted it nearly hot:smiley2:

 

[southcoastboile]

8 mbar sounds quite low, normaly boilers will give you 3 different bp settings so 8mbar was probably too low so he may have upped it to the min setting displayed on the data badge although 13 doesn't sound like its the min setting.

 

[GrahamM]

The FF55 max BP is 13MB.

Was the boiler at full temperature? As the BP usually will rise slightly as boiler heats, so rather than wait for this, maybe he was making a judgement of 12MB cold and as it heats it will approach the 13MB max.