Re: New boiler system over-pressure


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Posted by Joe Izzo on December 27, 1997 at 19:25:43:

In Reply to: New boiler system over-pressure posted by Dale Van Aken on December 27, 1997 at 12:04:28:

: I have a new 150,000 btu boiler with a 60 gal indirect fired hot water heater. Both heat and HW have their own circs. The system seems to regulate between
: 15-20 pounds for a few days, then blows the pressure relief valve (set at 30#). The water inlet control has been replaced and the expansion tank has been
: replaced and upgraded to a Amtrol Model 60. All looked good for a few days, then 2 quarts of hot water on the floor. The installer is stumped. Me too. Any
: of you boiler pro's seen this before? Thanks.

On second thought if you have a (DCV) double check valve on your water service and a passing zone or flo valve you could have thermal expansion from the indirect hot water tank causing water to blow off from the hot water storage tank


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