71
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 thru
Boiler,
GPM
@ 20°F
Delta T
Flow,
GPM
@ 25°F
Delta T
Min Req’d
Flow thru
Boiler,
GPM
@ 35°F
Delta T
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
ALP080 1 1 1 1 7.3 5.8 4.2
SL27 6 9 19.3
Taco 0014
Grundfos UPS26-99 FC
(second speed)
42B
SL35 6 9 19.3
SL50 6 9.5 19.8
SL70 6 10 20.3
SL119 14 17 NA Not Recommended NA Note 1
ALP105 1 1 1 1 9.6 7.7 5.5
SL27 6 9 19.3
Taco 0014
Grundfos UPS26-99 FC
(second speed)
42B
SL35 6 9 19.3
SL50 6 9.5 19.8
SL70 6 10 20.3
SL119 14 17
NA Not Recommended
NA Note 1
ALP150 1 1 1 1 13.8 11 7.9
SL27 6 9
41A Note 2
SL35 6 9
SL50 6 9.5
SL70 6 10
SL119 14 17 36
Taco 1400-45
Grundfos UPS 32-80/2
(max speed)
42B
NOTES:
Note 1: Required Alliance SL Coil Flow Rate exceeds Max Allowable Flow Rate thru 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 thru Boiler; this Model can only be installed as separate heating zone off system header
- see Figure 41A 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 thru 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.
Table 21: Recommended Circulator Models for Alpine (ALP) Boilers and Alliance SL Indirect Water Heaters
Installed as Part of Near-Boiler Piping Up to 75 Ft. Equivalent Length - Domestic Hot Water Circulator
X. Modular Installation (continued)
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