Air pressure switches explained...

[AlexGas]

OK, these guys are in USA but it’s a good read:

www.ho****er.com/lit/bulletin/tb-a023-06.pdf

After you click on the link, in your address bar change 4 stars to T W A T

It's at www.hot water.com one word

 

[gassafe]

The link does not load for me?

 

[AlexGas]

In your address bar change 4 stars to T W A T


What a day!

 

[gassafe]

Thanks, I did wonder what the censored bits where lol!