Dunkirk Q90-50 - Page 6

Boilers(withexceptionof90-75propane(LP)product)
arefactoryequippedforoperationataltitudesranging
from0-10,000feetabovesealevel.
Nochangesto factorysettingsarerequiredfor
installationsfrom0-5,000feetabovesealevel.
Foraltitudesfrom5,000-10,000feetabovesealevel
gasmanifoldpressureneedsto beadjustedbasedupon
calorific(Btu)valueofsupplygas(contactlocalgas
utilityordistributorforthisvalue).
Forspecificsettingsreferto Table2 fornaturalgas
applicationsandTable3, Page7 for propane(LP)gas
applications.
• Instructionsonhowto adjustgasmanifoldpressure
settingsseeFigure25 andFigure26, Page44.
Note90-75propane(LP)applicationsfor5,000- 10,000
feetabovesealevelrequireorificechangeaswellasgas
manifoldpressureadjustmentbaseduponcalorific(Btu)
valueofsupplygas.
RefertoTable2 andTable3forhighaltitudeorifice
partnumbers.Forreplacinganorificereferto specific
instructionsincludedwithconversionkit.
Table 2 - NATURAL GAS
Altitude in Ft.
Normal Input (MBH)
Combustion Setting (CO_)
Orifice
0-5,000
50 [ 1 l 1
8.7 - 9.7% (CO < 100 ppm)
43331094 I 43331094
Altitude in Ft. 0-5,000
Normal Input (MBH) 75 [ 1 1 1
Combustion Setting (CO_) 8.7 - 9.7% (CO < 100 ppm)
Orifice 43331092
Altitude in Ft.
Normal Input (MBH)
Combustion Setting (CO_)
Orifice
43331092 I
0-5,000
100 [ l l l
8.7 - 9.7% (CO < 100 ppm)
43331090 1 43331090
++Contact local gas utility or distributor for Btu value of gas.