baxi bahama 100 burner pressures

[darren bergin]

hi i am about to take my acs
but whilst checking out my own boiler baxi bahama 100 and setting burner pressures
i adjusted min & max ok
but my max (13.5mbar) drops down to about 8mbar after 20 seconds
(hot taps full on)
what is happening here ...is this normal??

 

[Agile]

Maybe its modulating back because the water is hot enough?

Turn all hot on and water temp up to max and measure mod coil voltage to see whats happening.

Tony

 

[darren bergin]

i was thinking along those lines ...........but temp stat is set to max and boiler only runs for about 20-30 secs before pressures drop!
Do you know what voltage i should expect on test?
thanks

 

[baxpoti]

What flow rate have you got?

Does the burner pressure fluctuate fairly quickly?

 

[gazthepottertonengineer]

as long as your waters hot enough dont worry bout i
if its not probably down to crap in plate h/exch