Install Instructions

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Table 16 (continued): Recommended Circulator Models for Alpine Boilers and Alliance SL Indirect Water Heaters Installed as Part of Near-Boiler Piping Up to 75 Ft. Equivalent Length - Domestic Hot Water 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
Max
Allowable
Flow
through
Boiler,
GPM @
20°F DT
Flow,
GPM
@ 25°F
DT
Min Req’d
Flow
through
Boiler,
GPM
@ 35°F
DT
Alliance SL
Models to
be installed
As Part of
Near-Boiler
Piping
Alliance
SL
Coil
Required
Flow Rate,
GPM
Alliance
SL Coil
Head
Loss, Ft @
Required
Flow Rate
Combined
Boiler,
Alliance SL
& Piping
Loop Head
Loss, Ft
*Recommended
Circulator Make &
Model for
Alliance SL
installed as Part
of Near-Boiler
Piping
Reference
Figure
Notes
ALP210B 1 1 1-1/4 1-1/4 19.4 15.5 11.1
SL27 6 9
NA Not Recommended 25B Note 2
SL35 6 9 SL50 6 9.5 SL70 6 10
SL119 14 17 29.7
Taco 1400-45
Grundfos UPS 32-
80/2 (max speed)
25B
ALP285B 1-1/4 1-1/4 1-1/2 1-1/2 26.5 21.2 15.1
SL27 6 9
NA Not Recommended 25B Note 2
SL35 6 9 SL50 6 9.5 SL70 6 10
SL119 14 17.0 27.0
Taco 1400-45
Grundfos UPS 32-
80/2 (max speed)
25B Note 3
NOTES: Note 1: Required Alliance SL Coil Flow Rate exceeds Max Allowable Flow Rate through Boiler; this Boiler/Alliance SL combination may result in boiler heat exchanger erosion and noise. Note 2: Required Alliance SL Coil Flow Rate is below Min Required Flow Rate through Boiler; this Model can only be installed as separate heating zone off system header - see Figure 24A for alternate IWH piping. Indirect Water Heater Circulator must be selected by an installer based on Alliance SL required coil ow and corresponding coil head loss shown as well as total equivalent length of such separate zone. Note 3: Combined Head Loss shown corresponds to Min Required Flow Rate through Boiler. * 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.
VI. Water Piping and Trim E. Multiple Boiler Installation (continued)