greenstar 28i

[dancinplumba]

got minus 6 on fan pressure, is this greater or less than minus 3.9 ?
can never work it out. TIA

 

[anz]

Less

 

[dancinplumba]

Sussed it, the more minus the number the less resistance there is so doesn't need a strip, found an old post in September

 

[dancinplumba]

http://www.ukplumbersforums.co.uk/g...worcester-bosch-flue-pressure.html#post807634

 

[gassafe]

Same as any number... Like -6 is colder than -3.9 etc

 

[dancinplumba]

Same as any number... Like -6 is colder than -3.9 etc

so its more than ? ya confusing me haha

 

[bewsh]

I think the MI's say it must be greater than -3 or whatever, so anything less than -2.9 requires a strip down.

 

[dancinplumba]

I think the MI's say it must be greater than -3 or whatever, so anything less than -2.9 requires a strip down.

so plus 1 is less than minus 1 ? haha

 

[Ollieg]

ahhh my brain hurts. lower = better

 

[Ad_stoke]

Could you use a U gauge instead of digital manometer to test the pressure of fan?

 

[dancinplumba]

Could you use a U gauge instead of manometer to test the pressure of fan?

a U gauge is a manometer, I use my Kane FGA

 

[Ad_stoke]

Sorry I meant to say. Can you use a water gauge instead of a digital gauge

 

[dancinplumba]

no worries, don't see why not

 

[Ad_stoke]

There is no minus on my water gauge lol.. So how do I work this one out lol

 

[dancinplumba]

hmmmm, it will get sucked up instead of being pushed down ?

 

[Ad_stoke]

lol

 

[dancinplumba]

next time am going to try it

 

[stevetheplumber]

in the book they say greater than which realy confuses me

 

[GrahamM]

Could you use a U gauge instead of digital manometer to test the pressure of fan?

Not accurate enough!

 

[dancinplumba]

in the book they say greater than which realy confuses me

me too !!

 

[GrahamM]

Best way to think is ignore the minus!
6 is greater than 3.9, 5 is greater than 4.2 etc.

 

[Ad_stoke]

Am more confused now.... On MI it states electronic manometer...... Any servicing guys about who could clarify?

 

[snoopy8888]

when you measure the fan pressure, you measure the pull or suction of the fan. That's why you get a minus sign. ignore the minus sign.
(-)5 is bigger suction than (-)4.

 

[Rckape]

Am more confused now.... On MI it states electronic manometer...... Any servicing guys about who could clarify?

A water gauge is a manometer, an electronic gauge is also a manometer.

Don't get hung up on the detail. I've never tried a water gauge for fan test, but I'd be inclined to agree with GrahamM in that it won't be accurate enough.

If your servicing you'll have fga anyway so just use the pressure function on that.

 

[RoryD]

Sussed it, the more minus the number the less resistance there is so doesn't need a strip, found an old post in September

Yep, the more negative ........the better