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Table 12A: Recommended Circulator Models for Alpine (ALP) Boilers Based on 25°F Temperature Differential
and Up to 75 ft. Equivalent Length Near-Boiler Piping - Space Heating Circulator
Boiler
Model
Boiler Supply
Connection,
Inch, FPT
Boiler Return
Connection,
Inch, FPT
Near-Boiler
Piping
Supply Pipe
Size, Inch
Near-Boiler
Piping
Return Pipe
Size, Inch
Flow, GPM
@ 25°F Temp.
Differential
Combined
Boiler & Piping
Loop Head
Loss, Ft.
* Recommended
Circulator
Make & Model
ALP080 1 1 1 1 5.8 10.3
Taco 0010
Grundfos UPS
15-58 FRC
ALP105 1 1 1 1 7.7 15.1
Taco 0014
Grundfos UPS
26-99 FC (second speed)
ALP150 1 1 1 1 11.0 13.1
Taco 0014
Grundfos UP
26-99 FC (rst speed)
ALP210 1 1 1¼ 1¼ 15.5 12.7
Taco 0014
Grundfos UP
26-99 FC (rst speed)
ALP285 1¼ 1¼ 1½ 1½ 21.5 13.0
Taco 0013
Grundfos UP
26-99 FC (third speed)
ALP399 1½ 1½ 2 2 30.2 12.0
Taco 1400-20
Grundfos UPS
32-80/2 F (second speed)
N
otes:
* Circulator Models shown are not equipped with internal ow check valve (IFC).
When selecting Circulators with IFC contact Circulator Manufacturer for sizing information.
Near-Boiler Piping Size shown is based on 2 to 5.5 Ft/Sec. velocity range to avoid potential noise and pipe erosion.
a. The ow rate through the isolated near-boiler
loop is maintained by factory recommended and
installer supplied boiler circulator.
b. The ow rate through the isolated near-boiler
loop is completely independent of the ow rate
through the heating system loop(s).
c. The ow rate through the heating system loop(s)
is controlled by installer sized/provided system
loop circulator(s).
d. This piping arrangement can be used either for
space heating-only applications or space heating
with indirect water heater(s) applications.
i. Space heating only - refer to Table 12A and
Figures 31A or 31B “Near Boiler Piping
- Heating Only” as applicable.
ii. Space heating plus indirect water
heater(s) - refer to Tables 12A, 12B and, as
applicable, to:
• Figures 32A or 32B “Near Boiler Piping -
Heating Plus Indirect Water Heater”
- when indirect water heater can be piped
as part of near-boiler piping.
• Figures 32C or 32D “Near Boiler Piping -
Heating Plus Indirect Water Heater”
- when indirect water heater must be
piped as a separate heating zone off the
system header.
e. For installations where indirect domestic hot
water heater is combined with space heating,
when sizing an indirect water heater circulator,
compare the specied 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 12B.
f. When Alliance SL™ model coil ow rate,
required to achieve water heater rating, falls
within the specied ow range for Alpine
boiler model, the Alliance SL™ model can be
piped as part of Alpine near-boiler piping.
Refer to Table 12B, Figures 32A, 32B, 35 and 36
for recommended circulator models, piping and
wiring details.
g. When Alliance SL™ model coil ow rate,
required to achieve water heater rating,
exceeds the specied 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 12B for
details.
h. When Alliance SL™ model coil ow rate,
required to achieve water heater rating, falls
below the specied 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 12B, Figures
32C, 32D, 37A and 37B for piping and wiring
details.