could anyone explain why burner pressures decline? assuming piping , meter and gas valve filter not clogged up why do they decline. i find myself constantly adjusting burner pressures whilst servicing? curious as ive never had it explained. other engineers dont seem to know either!!!!!!
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burner pressure
- Thread starter drew100
- Start date
H
holty
basic logic, parts get worn e.g diaghrams and springs
H
holty
silly question your not checking while its modulating.
I find some older boiler if left for years without adjustment can lose a mB or two but nothing major
Apart from some older Vaillants which covered the burner pressure with a lead seal and then had to do a recall when they drifted seriously upwards!
When I first encountered that I called them to ask if it was a common problem!
Of course I got the reply that it was the first they had heard of it. A few months later a recall for that problem!!!!
Tony
When I first encountered that I called them to ask if it was a common problem!
Of course I got the reply that it was the first they had heard of it. A few months later a recall for that problem!!!!
Tony
N
namsag
The obvious being wear and tear in meter/govemor and appliance gas valve/ injectors. Vibratiom in system will also cause it screw moves very gradually over time, i have seen fire restrictor elbows screw right down with work been carried out with jack hammers outside a property
the screw in the cap has a drive in it that should engage with slot in inner screw to prevent this problem, although I have also come across it a few times
N
namsag
KIT 32 that BG used to supply always had the drive /slot but a lot of the cheaper copies never had the drive/slot to stop this
N
namsag
cough cough 
I have never seen one without.
But if you dont screw the closing screw down with the top cap then it might be too far down to engage.
Tony
N
namsag
Agile with you still being relatively inexperienced give it time you will come across one. And thanks for the tip on put cap screw on , have you ever tried to teach your granny how to such eggs. 
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