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    joeyb22's Avatar
    joeyb22 Posts: 2, Reputation: 1
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    #1

    Dec 19, 2009, 12:29 PM
    My burnham series 2 (model B)gas boiler won't build pressure
    My burnham series 2 (model B)gas boiler won't build pressure. Installed a new thermostat and now the pressure won't build up to circulate the water. Any ideas?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 19, 2009, 06:24 PM
    Is this steam or hot water?
    joeyb22's Avatar
    joeyb22 Posts: 2, Reputation: 1
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    #3

    Dec 19, 2009, 08:54 PM

    Hot water
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Dec 19, 2009, 10:54 PM
    Hot water Boiler pressure is caused first by the water pressure in the system then as the water heats by expansion. That is why your system has an expansion tank.

    Check the systems water pressure on the indicator and add water by the auto fill valve if necessary.
    Single story 12 psi is a normal setting.
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