PB Heat MI/MIH series - Manual (Page 11)

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C. PIPING FOR ZONED SYSTEMS
1. See Figures 3.5 and 3.6 for basic zoned system
layouts.
2. Run each zone pipe down then up to zone to
prevent air accumulation in piping.
3. If required, provide means to isolate and drain each
zone separately.
WATER PIPING AND CONTROLS
Figure 3.5: Zone Piping with Zone Valves
Figure 3.6: Zone Piping with Circulators