Fingers crossed

The Glitch:

An installer is asked to add a monobloc-style air-to-water heat pump to an existing hydronic system that is supplied by a mod/con boiler. The system is located in a cold winter climate. The system has five zones controlled by zone valves. The system — as installed — is shown in Figure 1.

Can you spot several problems with this piping configuration and come up with an alternate layout?

Are you an ace troubleshooter?

Within the pages of this magazine, PM’s Hydronics Editor John Siegenthaler, P.E., will pose a question to you, our readers, to review a system’s schematic layout and discover its faults, flaws and defects. Discover archived “The Glitch & The Fix” exercises at its radiant-focused website, www.radiantandhydronics.com. Good luck!