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Pressuretrol Settings

This may be a stupid question, but please humor me.

My 1-pipe system has a PA404A pressuretrol. The cut-in is all the way down. I'd like to check the differential, as I think my system pressure is too high (boiler runs for a long time and doesn't shut down after all rads are hot until thermostat shuts it.)

How do I open the pressuretrol to check it? I was reluctant to just take the screw out of the front in case I wasn't supposed to.



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