please explain the function of the air pressure switch - obviously it allows the fan to start so does not rely on pressure to run the fan but it changes state when it detects the fan running - is this correct? it then switches the fan off - yes?
air pressure switch
- Thread starter gasman12
- Start date
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ehh 
the aps tells the pcb that the fan is running as part on the ignition sequence
gasman
the aps tells the pcb that the fan is running as part on the ignition sequence
gasman
thanks - I was looking for a bit more detail though - if the aps allows the fan to start in the first place without any air pressure from the fan, surely the air pressure from the fan will then switch the fan off
err yer talking balls bonny lad
and obviously don't understand how it works
the aps is part of the ignition sequence
if you don't understand that try going back and asking a question you might understand the answer to
and obviously don't understand how it works
the aps is part of the ignition sequence
if you don't understand that try going back and asking a question you might understand the answer to
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the fan starts and makes the switch not the other way about
the aps is there to prove that the fan is running so there isnt combustion without the fan running
the aps is there to prove that the fan is running so there isnt combustion without the fan running
i cannot believe anyone who has passed CCN1 asking this question, surely you covered controls during your course. i suggest you go back and have a look over your books before you do any boiler maintenance
H
holty
who said hes done ccn1.ps just to confuse. most modern boilers dont have one.
You are trying to insult me but this is obviously way above your heads - I am looking into the electronics of the PCB to find out the switching logic - need to learn a bit more than "its part of the ignition sequence" - maybe some of you change things until it works but a fault on a PCB will be a result of a single component that will cost pennies to replace.
Never mind, I'll figure it out!
Never mind, I'll figure it out!
so why didn't you ask the freaking question in the first place
if you don't understand how the aps works i would stay put till you do
as for insults
ask me in a nice way
no 1 mentioned changing parts?
if you dont know how the sequence works god help you when you work out how to get the cover off the pcb
H
holty
yep way above my head thats why i use a multimeter to test the aps.being a three wire aps or two wire aps on either an electronic ignition or permanent pilot.no need to go into the relms of pcb checking till you know what values your getting to and from the aps.
bugger i never thought of that
apologies if my post insulted you, but your comments were so basic and so wrong i advised you to start at the beginning again, now you say you are looking at pcb electronics and sequences, but if you think the aps controls the fan then you will never understand the more complicated sequences until you comprehend the basic sequence of a standard effieciency boiler, so are you competent and fully understand basic component sequence and function, and what are you trying to actually do/understand
perhaps i shouldnt have assumed but given the name gasman12 and a question on boilers, and it would appear i'm correct and he has done CCN1 (although he hasnt confirmed it, only took the cream puff that we were insulting him)
i think most of us are aware modern condensing boilers are different to older boilers with aps and fan, but i didnt mention it cause it wasnt relevant as he was asking about aps function
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