Boilers For Use At High Altitude - United States Installations - ECR International Utica Boilers UB90-50 Installation, Operation & Maintenance Manual

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
installations 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
calorific (Btu) value of supply gas (contact local gas
utility or distributor for this value).
• For specific 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)
Orifice
Altitude in Ft.
Normal Input (MBH)
Orifice
Altitude in Ft.
Normal Input (MBH)
Orifice
++Contact local gas utility or distributor for Btu value of gas.
Table 2 - NATURAL GAS
MODEL 90-50
Stock Factory
Settings 750
0-5,000
50 –
43331094
MODEL 90-75
Stock Factory
Settings 750
0-5,000
75 –
43331092
MODEL 90-100 /
Stock Factory
Settings 750
0-5,000
100 –
43331090
6
• Instructions on how to adjust gas manifold pressure
settings see Figure 25 and Figure 26, Page 44.
Note 90-75 propane (LP) applications for 5,000 - 10,000
feet above sea level require orifice change as well as gas
manifold pressure adjustment based upon calorific (Btu)
value of supply gas.
Refer to Table 2 and Table 3 for high altitude orifice
part numbers. For replacing an orifice refer to specific
instructions included with conversion kit.
Btu Value of Natural Gas++
850 950
5,000-10,000
– –
43331094
Btu Value of Natural Gas++
850 950
5,000-10,000
– –
43331092
Btu Value of Natural Gas++
850 950
5,000-10,000
– –
43331090
1000 1050
– –
1000 1050
– –
1000 1050
– –
P/N 240010135 Rev. D [04/15/2017]