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Pressuretrol working?

How can I confirm my pressuretrol is working? I have the main set at about 1.5 and the negative differential at .75, and the boiler NEVER cycles off due to pressure, only temperature. The internal siphon on my Burnham reads between 5-12psi, but I read that these are not very reliable.

Is this normal? (Should I just be happy that everything seems to be working?)

How can I test to make sure pressuretrol is working?

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