LAARS Heating Systems
Page 24
Figure 10. Hydronic Piping — Multiple Boilers, Indirect DHW Off of One Boiler
Space heating zone circuits
Space heating zone circuit
Air vent
Water feed
controls
Expansion tank
Common piping must be sized for the
combined water flow of all the boilers.
High temp. space heating zone circuit
4 pipe dia. max.
4 pipe dia. max.
4 pipe dia. max.
Indirect
DHW tank
Note -
Indirect pump
must be sized
for boiler and
indirect
Anti-scald
mixing valve
Domestic
hot water
out
Cold
water
Note -
In this piping arrangement,
the boiler pump must turn off
during DHW operation.
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.
