Page 27
HTD
Figure 10. Boiler Piping — Multiple Boilers, Multiple Temperature Zones, Reverse Return.
Zoning with circulators
Space heating
zone circuits
Low temp. radiant zone
Space heating zone circuit
Air vent
Water feed controls
Expansion tank
Common piping must be sized for the
combined water flow of all of the boilers.
4 pipe dia. max.
4 pipe dia. max.
4 pipe dia. max.
Note -
This drawing is a schematic
representation of a piping style,
and is not intended to be used
as a working installation drawing.
Local code requirements
must be met.
