Alpine ALP150B - Flow Range Requirement through Boiler

56 103448-07- 1/16
Boiler
Model
Boiler
Supply
Connection,
Inch, FPT
Boiler
Return
Connection,
Inch, FPT
Minimum
Required
Flow (GPM)
@ 35°F ΔT
Boiler
Head Loss,
Ft.
@ 35°F ΔT
Required
Flow,
(GPM)
@ 30°F ΔT
Boiler
Head Loss,
Ft.
@ 30°F ΔT
Required
Flow,
(GPM)
@ 25°F ΔT
Boiler
Head Loss,
Ft.
@ 25°F ΔT
Maximum
Required
Flow (GPM)
@ 20°F ΔT
Boiler
Head Loss,
Ft.
@ 20°F ΔT
ALP080B 1 1 4.2 4.8 4.9 6.4 5.8 8.9 7.3 13.4
ALP105B 1 1 5.5 7.0 6.4 9.3 7.7 12.8 9.6 19.1
ALP150B 1 1 7.9 5.2 9.2 6.6 11.0 8.9 13.8 12.7
ALP210B 1 1 11.1 5.4 12.9 7.1 15.5 9.8 19.4 14.4
ALP285B 1¼ 1¼ 15.1 5.9 17.7 7.8 21.2 10.7 26.5 16.0
Notes: Required Flow (GPM) = ** Output (MBH) x 1000/500 x ΔT
** Output (MBH) - Select Value for specic Boiler Model from Table 2.
See also Table 13 for near boiler piping sizing. Using boiler
antifreeze will result in higher uid density and may require larger circulators.
Table 12: Flow Range Requirement Through Boiler
VI. Water Piping and Trim B. Piping System To Be Employed (continued)
c. It is often very difcult to accurately calculate
the pressure drop through the system.
d. In replacement installations, it may be nearly
impossible to get an accurate measurement of
piping amount and number of ttings in the
system. If system is zoned, the system ow rate
may drop well below recommended minimum
ow when only a single zone is calling for heat.
80
105
150
210
285
0
2
4
6
8
10
12
14
0 5 10 15 20 25
Pressure Drop (Feet of Head)
Flow Rate (GPM)
Pressure Drop vs. Flow