ECR International Utica Boilers UB90-50 Installation, Operation & Maintenance Manual page 7

BOILERS FOR USE AT HIGH ALTITUDE - UNITED STATES INSTALLATIONS
Model 90-75 propane (LP) units only at altitudes
above 5,000 ft., install 90-75 High Altitude Orifice Kit
#550002629*.
For all other altitudes use sea level orifice
Altitude in Ft.
Normal Input (MBH)
Orifice
Altitude in Ft.
Normal Input (MBH)
Orifice
* For model 90-75 Propane units only at altitudes above 5,000 ft., install 90-75 High Altitude Orifice Kit #550002629 For all other
altitudes use sea level orifice.
Altitude in Ft.
Normal Input (MBH)
Orifice
++Contact local gas utility or distributor for Btu value of gas.
Table 3 - PROPANE GAS
MODEL 90-50
Stock Factory
Settings 2300
0-5,000
50
–
43331095
MODEL 90-75*
Stock Factory
Settings 2300
0-5,000
75 –
43331093
MODEL 90-100 **
Stock Factory
Settings 2300
0-5,000
100
–
43331091
7
Btu Value of Propane Gas++
2350 2400
5,000-10,000
– –
43331095
Btu Value of Propane Gas++
2350 2400
5,000-10,000
– –
43331096*
Btu Value of Propane Gas++
2350 2400
5,000-10,000
– –
43331091
P/N 240010135 Rev. D [04/15/2017]
2450 2500
– –
2450 2500
– –
2450 2500
– –