33Quadra-Fire • EXCURSION-I, EXCURSION-II, EXCURSION-III Installation Manual • 2538-980 Rev. E • 5/19D. High Altitude InstallationsNOTICE: If the heating value of the gas has been reduced,these rules do not apply. Check with your local gas utilityor authorities having jurisdiction.When installing above 2000 feet elevation:• In the USA: Reduce input rate 4% for each 1000 feetabove 2000 feet.• In CANADA: Input ratings are certified without a reductionof input rate for elevations up to 4500 feet (1370 m)above sea level. Please consult provincial and/orlocal authorities having jurisdiction for installations atelevations above 4500 feet (1370 m)Check with your local gas utility to determine properorifice size.E. Air Shutter SettingAir shutter settings should be adjusted by a qualified ser-vice technician at the time of installation. The air shutteris set at the factory for minimum vertical vent run. Adjust-ing air shutter may be desired for longer vent runs. SeeFigure 7.5.NOTICE: If sooting occurs, provide more air by openingthe air shutter.Figure 7.5 Air ShutterAir Shutter SettingsNG PropaneEXCURSION-I 3/16 in. 3/8 in.EXCURSION-II 3/8 in. Full OpenEXCURSION-III 3/8 in. 1/2 in.F. Service / Replace Appliance Gas Valve• See Figure 7.6.• Remove appliance front, glass, logs, base pan assem-bly, burner assembly and valve plate assembly. SeeFigure 7.6.• Service/Replace gas valve.• Reinstall valve plate assembly, burner assembly, basepan assembly, logs and appliance glass and front.Figure 7.6 Gas Valve DetailSERVICE / REPLACEAPPLIANCE GAS VALVE