Install Instructions

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VI. Water Piping and Trim E. Multiple Boiler Installation Water Piping (continued)
E. Multiple Boiler Installation Water Piping –
(See Table 15 and Figures 24A, 24B, 25A and 25B)
1. Refer to this Section of this manual for:
a. Installation of Factory Supplied Piping and Trim
Components for an individual module (boiler).
b. Regarding an individual module (boiler) piping
system specic details.
c. Selection criteria for individual module (boiler)
space heating and/or DHW circulators.
2. For installations where indirect domestic hot
water heater is combined with space heating,
when sizing an indirect water heater circulator,
compare the specied ow range through an Alpine
model boiler to an indirect water heater (Alliance
SL™) model coil ow rate required to achieve water
heater rating. Refer to Table 16 and Figures 24A,
24B, 25A and 25B.
a. When Alliance SL™ model coil ow rate,
required to achieve water heater rating, falls
within the specied ow range for Alpine
boiler model, the Alliance SL™ model can be
piped as part of Alpine near-boiler piping.
Refer to Table 16 and Figures 25A and 25B.
b. When Alliance SL™ model coil ow rate,
required to achieve water heater rating,
exceeds the specied ow range for Alpine
boiler model, the Alliance SL™/Alpine boiler
combination may result in excessive noise and
boiler heat exchanger erosion, and therefore,
is not recommended. Refer to Table 16 for
details.
c. When Alliance SL™ model coil ow rate,
required to achieve water heater rating, falls
below the specied ow range for Alpine boiler
model, the Alliance SL™ model must be piped
as a separate heating zone off the system
header. The circulator must be sized based on
the Alliance SL™ model coil ow and combined
coil pressure drop and the zone piping total
equivalent length. Refer to Table 16 and Figures
24A and 24B for details.