boiler firing sequence question

[o_elmi]

Hello !

Can anybody help or point me in the right direction. I need a boiler firing sequence for regular/conventional natural draught- room sealed boiler, natural draught- open flue boiler.
regular/conventional open flue fan assisted boiler
regular/conventional room sealed fan assisted boiler
system boiler/ condensing
system boiler regular
Ive got a book on combies but it has no info on regular or system. I looked in many books and its getting confusing.
Thank you for any help you can provide.

 

[Dotty]

Why do you ask?

 

[glenno1]

A gas forum question me thinks

 

[0304Driver]

Someones got some homework!

 

[lame plumber]

or needs to stay awake at college