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BOILERS FOR USE AT HIGH ALTITUDE - UNITED STATES INSTALLATIONS
• Boilers (with exception of 90-75 propane (LP) product)
are factory equipped for operation at altitudes ranging
from 0-10,000 feet above sea level.
• No changes to factory settings are required for installa-
tions from 0-5,000 feet above sea level.
• For altitudes from 5,000-10,000 feet above sea level
gas manifold pressure needs to be adjusted based upon
calorifi c (Btu) value of supply gas (contact local gas
utility or distributor for this value).
• For specifi c settings refer to Table 2 for natural gas
applications and Table 3, Page 7 for propane (LP) gas
applications.
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifi ce
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifi ce
Altitude in Ft.
Normal Input (MBH)
Manifold Pressure In W.C.
Orifi ce
++Contact local gas utility or distributor for Btu value of gas.
Table 2 - 90 - 50/75/100 SERIES 2 NATURAL GAS
Stock Factory
Settings
0-5,000
50
2.5
43331094
Stock Factory
Settings
0-5,000
75
2.5
43331092
Stock Factory
Settings
0-5,000
100
2.5
43331090
• Instructions on how to adjust gas manifold pressure
settings see Figure 27 and Figure 28, Page 44 .
Note 90-75 propane (LP) applications for 5,000 - 10,000
feet above sea level require orifi ce change as well as gas
manifold pressure adjustment based upon calorifi c (Btu)
value of supply gas.
Refer to Table 2 and Table 3 for high altitude orifi ce part
number. For replacing orifi ce refer to specifi c instructions
included with conversion kit.
MODEL 90-50
Btu Value of Natural Gas++
750
850
–
–
4
4
MODEL 90-75
Btu Value of Natural Gas++
750
850
–
–
3.5
3.5
MODEL 90-100
Btu Value of Natural Gas++
750
850
–
–
3.5
3.5
6
950
1000
5,000-10,000
–
–
3.5
2.5
43331094
950
1000
5,000-10,000
–
–
2.5
2.5
43331092
950
1000
5,000-10,000
–
–
2.5
2.5
43331090
1050
–
2.5
1050
–
2.5
1050
–
2.5
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