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What does the low limit do, and where should it be set? My furnace has a honeywell triple aquastat relay and has a difference dial. Water temp is about 190 deg F. Also, water psi gauge is only showing about 10 lbs. does not appear to move.

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Strong chance that the gauge is wrong or completely broken – Vitaliy Jan 23 at 6:45
It's difficult to tell what you're asking, as it seems you may be mashing multiple questions together. – Tester101♦ Jan 23 at 12:32
Why do you expect the pressure gauge to move, are you doing something that you feel should change the pressure? – Tester101♦ Jan 23 at 12:33

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