Question about Heating & Cooling
In a hydronic system for heating you must insure that the pressure on the boiler is maintained during the process of bleeding off the air from the system. There is a regulator for the water make-up to the system which normally maintains 12 PSI with the boiler cold. If this is stuck or fails to open you will loose the pressure on the system when bleeding the air off. Most are adjustable. Loosen lock nut on the adjustment stem and turn the screw (clockwise) to increase the pressure. Count the turns as you adjust it and return it to the original setting when you finsh bleeding off the air.
Posted on Oct 30, 2008
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Posted on Jan 02, 2017
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