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B. Piping System To Be Employed.
Alpine (ALP) boilers are designed to operate in a closed
loop pressurized system. Minimum pressure in the
boiler must be 12 PSI. Proper operation of the Alpine
(ALP) boiler requires that the water ow through the
boiler remain within the limits shown in Table 11, any
time the boiler is ring.
Boiler
Model
Boiler
Supply
Connection,
Inch, FPT
Boiler
Return
Connection,
Inch, FPT
Minimum
Required Flow
(GPM)
@ 35°F DT
Boiler
Head Loss,
Ft.
@ 35°F DT
Required
Flow,
(GPM)
@ 30°F DT
Boiler
Head Loss,
Ft.
@ 30°F DT
Required
Flow,
(GPM)
@ 25°F
DT
Boiler
Head Loss,
Ft. @ 25°F
DT
Maximum
Required
Flow (GPM)
@ 20°F DT
Boiler
Head Loss,
Ft.
@ 20°F DT
ALP080 1 1 4.2 4.8 4.9 6.4 5.8 8.9 7.3 13.4
ALP105 1 1 5.5 7.0 6.4 9.3 7.7 12.8 9.6 19.1
ALP150 1 1 7.9 5.2 9.2 6.6 11.0 8.9 13.8 12.7
ALP210 1 1 11.1 5.4 12.9 7.1 15.5 9.8 19.4 14.4
ALP285 1¼ 1¼ 15.1 5.9 17.7 7.8 21.2 10.7 26.5 16.0
ALP399 1½ 1½ 21.5 6.1 25.1 7.9 30.2 10.8 37.7 15.9
Notes: Required Flow (GPM) = ** Output (MBH) * 1000/500 * DT
** Output (MBH) - Select Value for specic Boiler Model from Tables 2A or 2B
Using boiler antifreeze will result in higher uid density and may require larger circulators.
Alpine Boiler Head Loss vs. Flow
80
105
150
210
285
399
0
2
4
6
8
10
12
14
16
18
20
0 5 10 15 20 25 30 35 40
Flow Rate (GPM)
Boiler Head Loss (Feet)
NOTICE
Failure to maintain the ow through boiler within
specied limits could result in erratic operation or
premature boiler failure.
1. Near boiler piping must isolate ALP boiler from
system piping via closely spaced tees to insure
specied ow range through boiler any time the
boiler is ring:
Table 11: Flow Range Requirement Through Boiler