Thanks. This sounds like experience accumulated over years of war-weary engagements... and
extremely valuable to boot, but how on earth do I justify (if anything bad happens in the future) deliberately asking my Engineer to go against the "book value" (I assume that means the manual? maybe the installation one?) if something / anything goes awry? I did not select this boiler (as with so many people) I inherited it... but I was kinda pleased with it - sure, it looks rather old and clunky, but reputation says it's a workhorse and will just keep going and going and going... I like that. It appeals to me.
I
will mention "ignition burner pressure is the same as the minimum burner pressure" to the Engineer tomorrow and see what his reaction is. You know how it'll be - he'll ask me where I got this and I'll say "a forum" and he'll raise his eyebrows at me.