Dunkirk GWB9-050IH-2 Installation Instructions 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 Orifi ce Kit
#550002629*.
For all other altitudes use sea level 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
* For model 90-75 Propane units only at altitudes above 5,000 ft., install 90-75 High Altitude Orifi ce Kit #550002629 For all other
altitudes use sea level orifi ce.
++Contact local gas utility or distributor for Btu value of gas.
Table 3 - 90 - 50/75 SERIES 2 PROPANE GAS
MODEL 90-50
Stock Factory
Settings
0-5,000
50
2.5
43331095
MODEL 90-75*
Stock Factory
Settings
0-5,000
75
2.5
43331093
Btu Value of Propane Gas++
2300 2350 2400
5,000-10,000
– –
3 3
43331095
Btu Value of Propane Gas++
2300 2350 2400
5,000-10,000
– –
3.5 3.5
43331096*
7
2450
– –
2.5 2.5
2450
– –
3.5 3
2500
–
2.5
2500
–
3