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O
T
The
MNI
HERM
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.
Air vent
Expansion tank
4 pipe dia. max.
Anti-scald
mixing valve
Domestic
hot water
out
NOTE: This drawing is a schematic
Cold
representation of a piping style,
water
and is not intended to be used
as a working installation drawing.
Local code requirements
must be met.
Indirect DHW tank
NOTE: Indirect pump must be
sized for boiler and indirect
Figure 7.
Space heating zone circuit
Water feed
controls
Common piping must be sized for the
combined water flow of all the boilers.
4 pipe Dia. Max
Boiler Piping — Multiple Boilers, Indirect DHW Off of One Boiler
Space heating
zone circuits
4 pipe dia. max.
4 pipe dia. max.
Lag
High temp.
space heating zone circuit
Lag
Lead
Page 31
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