I. zoning with zone valves – HTP 399M User Manual
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Figure 6
– Pressure Drop Graph and Temperature Rise Chart – LP-171-F NOTE: The recommended circulators are based on 1 gpm per 10,000
btu/hr with 20∆t.
The chart below represents various system temperatures, respective flows and friction loss through the boiler to aid in circulator
selection.
I. ZONING WITH ZONE VALVES
1. Connect boiler to system as shown in 2A and 2B in Piping Details when zoning with zone valves. The primary/secondary piping
shown ensures the boiler loop will have sufficient flow. It also avoids applying the high head of the boiler circulator to the zone valves.
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