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Thank you for the helpful info.

Hi, Thank you for the reply. Yes, it is a simple open closed switch and it will work with the connections made in either configuration. I am asking if there is a best practices hookup configuration. The diaphragm mechanism holds the switch open until a pressure differential is sensed and...

Hi, I have been trying to learn more about the furnace in our house. I have had a few techs come out and they have opined that the pressure switch connected to the combustion blower may or may not be giving intermittent problems. The furnace does occasionally display a code indicating that...

Thank you for this suggestion. I appreciate your taking my curiosity seriously and offering the helpful info. Thank you.

FWIW, It seems as if the AAV are very effective at sealing under pressure, which is what the tests I just made using the tips above seemed to indicate, but the function I really should be concerned about is how well the AAV opens and allows air to enter to prevent siphon action in the trap. I...

Thank you for the information and the helpful explanation.