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Pressure rise expansion tank?
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RobertHVACPro
Member Posts: 3
I was doing a boiler start up and set the system static pressure at 12 psi and the expansion tank pressure at 12 psi. After the system came up to temperature (180°F) the pressure was at 14.5 psi. I checked the sizing of my tank and its sized properly per amtrols sizing chart for a 125k btu CGi-5. Is this normal or is there a problem?
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Comments
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Are you pumping towards the tank or away from it?0
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2 psi increase is not an issue.
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream
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I’m “ pumping away” 😎
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@RobertHVACPro
2 psi rise is fine. In fact a lot of systems will go to 20psi or more when hot. It's not an issue unless you get over 24psi or so. 80% of the releif valve set point shouldn't be an issue. The larger the expansion tank the less pressure rise you get.1
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