Laars MagnaTherm HTD Series Installation And Operation Instructions Manual page 31

HTD
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.
Space heating zone circuit
Air vent
Water feed controls
Expansion tank
4 pipe dia. max.
Figure 10. Boiler Piping — Multiple Boilers, Multiple Temperature Zones, Reverse Return.
Zoning with circulators
Space heating
zone circuits
4 pipe dia. max.
Common piping must be sized for the
combined water ow of all of the boilers.
Low temp. radiant zone
4 pipe dia. max.
Page 27