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chefscott67 11-03-2010 08:02 PM

Crown Boiler closed system baseboard heat
I have a crown boiler with summer/winter hookup. It is a closed baseboard heat system, that is to say I do NOT have bleeder valves anywhere on or behind any baseboard cover. All I have is a pressure valve to allow water into the system should it drop below a certain psi level and a drain just below the circulating pump coming off the bottom of the boiler. I have been releasing water from the system in increments and refilling with the pressure valve in different combos and stages. I have managed to get heat upstairs when I add water to the system to the psi level of 30 to 40 psi. But, the system does not circulate and I can hear gurgling upstairs on the return end of the closed circuit of copper pipes. Any thoughts on how to get this air out so the circulating pump will do it's job? Thanks.

Plumber101 11-03-2010 08:38 PM

Time to get bleeders installed. There should atleat be a bleed at the boiler.

Also, 30-40 psi is way to high. The pressure reducing valve should regulate the water pressure to 12 psi

beenthere 11-04-2010 05:02 AM

Post pics of the piping near the boiler. You probably have a purge valve set up. But you don't recognize it for what it is. Might even have it above the boiler if the return piping comes back from 2 or more directions.

They had to have a way to get rid of the air when they first installed the system.

Bondo 11-04-2010 06:54 PM


when I add water to the system to the psi level of 30 to 40 psi. But,
I would think there should be a pressure relief valve on the boiler that should Blow Off at 30psi....

I agree with Plumber,... I'd cut in a few bleeds at some high points...

beenthere 11-04-2010 08:43 PM

Some boilrsr come with a 50 PSIG relief valve.

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