Are both parts (A & B) needed on boiler?

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  #1  
Old 12-14-19, 09:45 AM
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Are both parts (A & B) needed on boiler?

see pic
have 3 boilers, same oil pump, same burner
but they have different parts
if B is pressure switch, what is A?
if house pool have B, why does shop not have B?
and
could we just take B off house and pool?

thanks
 
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Old 12-14-19, 03:36 PM
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This is just a suggestion. Those valves did not come with the burner but were added on after so my suggestion would be to call your service man and find out why they were put on.

To answer your question the burner can be run without A. Can't tell what B is because of the angle of the pic but my guess would be that could be removed also.

If you google solenoid switch you can pull up info on their use on oil burners.

Hope this helps a little.
 
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Old 12-14-19, 04:31 PM
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Hi Thanks
Am talking to boiler tech but thought I would "smarten up" to act less dumb
B is a pressure switch
What is A?
 
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Old 12-14-19, 05:39 PM
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engrav
A is a solenoid valve.
 
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Old 12-14-19, 10:07 PM
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A is an oil delay solenoid valve. That burner prepurges the combustion chamber before igniting. It is most likely a factory installed OEM part.
 
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Old 12-14-19, 10:12 PM
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thanks

got it

but then the other question
we have 3 of these boilers
two have part A and one does not
two have part B and one does not

why not all 3 A and B?
 
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Old 12-14-19, 10:26 PM
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Some burners have prepurge and others don’t. Depends on the model and setup of the burner.
I’m not certain what the other part is other then it’s some type of pressure switch.
 
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Old 12-14-19, 10:36 PM
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thanks
maybe I have enough lingo now to talk to the boiler tech
ask him why 3 identical boilers and 3 identical burners and 3 identical pumps have different A and B setup

thanks again, over out
 
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Old 12-16-19, 06:47 AM
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B is indeed a pressure switch. Switches of this type of often used to trigger a relay to turn on a remotely located fuel supply pump.
 
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