20929 Bridge Street, Southfield, MI 48033 4121 Brockton Drive SE, Grand Rapids, MI 49512 6200 Baron Drive, Bridgeport, MI 48722 6910 Treeline Drive, Suite A, Brecksville, OH 44141 Phone: (800) 589-6120 - Fax: (248) 354-3710 www.deppmann.com Serving the industry since 1927 February 4th 2012 By Norman Hall Can I Change My Vacuum Condensate Pump to a Simple Condenste Pump? (Part 2) Last week we began a series about vacuum condensate units and introduced one of their uses: the reduction of time to bring a building up to temperature after a weekend setback. Today, the R. L. Deppmann Monday Morning Minute (MMM) looks at the second use of vacuum condensate pumps, temperature control. The modern hydronic boiler systems incorporate temperature set back controls. We understand that fin tube or coils will give out less BTUH if supplied with 140°F water instead of 200°F water. Back in the days where steam systems were common, how did you employ temperature set back controls? A boiler operating at 1 PSIG steam pressure produced steam at 215°F. The only way to supply steam below 212°F was to operate under a vacuum. If I could create a vacuum in the steam system, I could change the BTUH output of the radiator. In fact, if I change the pressure to 20” of vacuum, I can get water to boil at 161°F. Since the BTUH output of the radiator is directly proportional to temperature difference between the steam and the room air, one could vary the output of the radiator by varying the temperature at which the steam condensed. From Xylem HOFFMAN HS‐203C MANUAL Bell and Gossett VCD vacuum condensate unit operation from manual TES‐375 Many very smart people devised systems to operate under vacuum. Often, the system was named after them. I’ve seen some of these systems still in operation today. If your system was designed for variable vacuum temperature control and is still operating, don’t assume you can replace the vacuum condensate system with a straight “condensate only” system. Ask your R. L. Deppmann sales engineer to stop by and discuss it with your installing contractor or engineer. If you are not lucky enough to be in the Deppmann territory, Call your Bell and Gossett/Domestic pump representative for their assistance. Next week we look at a third reason you may have a vacuum condensate pumping system; condensate lift. Disclaimer: R. L. Deppmann and it’s affiliates can not be held liable for issues caused by use of the information on this page. While the information comes from many years of experience and can be a valuable tool, it may not take into account special circumstances in your system and we therefore can not take responsibility for actions that result from this information. Please feel free to contact us if you do have any questions.
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