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The Glitch & The Fix -- June 2006

June 1, 2006
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Learn to design more efficiently by troubleshooting the following hydronic schematic. The answer to this "glitch" can be found in PM's twice-montly e-newsletter Radiant & Hydronics e-News. Sign up for free here.

Are You An Ace Troubleshooter?

John Siegenthaler, P.E., has been challenging heating professionals to take a closer look at how radiant and hydronic systems should be designed to fit today's efficiency-minded world. His Web site,, offers some of the industry's leading software to creating these properly-designed systems, such as his newly released HydronicCAD software for drawing hydronic piping schematics.

Plumbing & Mechanical is looking to test your mettle, too. In the next few issues of this magazine, John has agreed to pose a question to you, our readers, to review a system's schematic layout and discover its faults, flaws and defects. The solution to each issue's question will be revealed in PM's e-newsletter, Radiant & Hydronics e-News. To sign up to receive this free, twice-monthly newsletter in your e-mail inbox, visit link at the bottom of this page and fill out the subscription form.

Good luck!

Click image for larger view.
Overview: The piping schematic below is typical of several installations that have reported complaints of overhead radiant floors.

It uses a variable speed injection circulator to control the water temperature supplied to a distribution system that operates with constant circulation during the heating season. The injection riser piping connects to both the primary loop and distribution loop with closely spaced tees. The injection riser piping drops down 18 inches to form a trap before rising to connect to the distribution system.

Question: What detail within this schematic do you think causes the overheating complaint?


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Recent Articles by John Siegenthaler, P.E.

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