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Re: HW Boiler Pressure Setting & Adjusting

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Posted by Harold hydronicnetwork.net on December 23, 2003 at 19:17:17:

In Reply to: HW Boiler Pressure Setting & Adjusting posted by Peter R on December 23, 2003 at 16:10:30:

I was told pressure should be no more than 15 psi.
*** Your immediate problem is the person who told you that; most likely a warm air tech getting all wet.

Where can or how do I adjust it?
*** You don't. The gases in the expansion tank change according to the known gas laws. The water in the system increases through expansion as the water heats up. As long as the pressure doesn't get over 25 psig to keep the relief valve open; all is well.

: 2. The Teckmar controller seemed to be set up very incorrectly, based on the Tekmar manual: it was set with a 150F max supply instead of 120F for hydronic with wood floors; it had a hear curve of 1.8 when the Tekmar chart shows a .75 curve; motor speed for the mixing value was set at 160sec when the controller test showed a 230sec speed to fully open the valve. Am I crazy? Is it just a function of knowing enough to be dangerous? I reset the Tekmar to: 120F max, .75 curve, 230sec motor speed. AND, hot spots in the floor are gone, tiles in the bathroom are not too hot to stand on, the temp does not overshoot at set point. How am I doing?
*** Track the heat of the water and the heat in the house as the weather changes to see how you have done and compensate accordingly.

: LASTLY: Where can I learn about this type of system: tuning, maintenance, proper setup?
*** Other than making sure the system has no leaks at any time, yearly maintenance to the burner and controls should be left to a pro with the proper pressure and combustion instruments to adjust to the published factory specifications and procedures until such time you gain that experience and knowledge. Consult the manufacturers for applicable service literature.

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