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De-rating for High Altitude
For U.S. installations, the Clarity Direct Vent is approved for elevations up to 2000 feet using the factory-installed burner
injectors. At elevations above 2000 feet, U.S. codes require a decrease in the input rating by changing the burner injectors to
a smaller size. The chart below lists by part numbers the appropriate injectors for both LP and natural gas at various altitudes.
For Canadian installations, the Clarity Direct Vent is approved for elevations up to 1375 meters (4500 feet). When installing
the Clarity Direct Vent at altitudes above 1375 meters (4500 feet), consult the local gas distributor or the authority having
jurisdiction for proper rating methods.
NOTE: The difference in altitude derating requirements for the U.S. and Canada is simply a result of differences in testing
standards between the two countries.
If the installer must convert the unit to adjust for varying altitudes, an information sticker like the one to the right must be
filled out and affixed to the appliance at the time of conversion.
NATURAL GAS
Front Harman Center Harman Rear Harman Nominal Btu
Altitude Injector Part No. Injector Part No. Injector Part No. Input Rate
0-2000' 47 Standard 56 Standard 39 Standard 40,000
2000-3000' 48 3-40-25848 56 Standard 40 3-40-25840 38,400
3000-4000' 49 3-40-25849 56 Standard 41 3-40-25841 36,900
4000-5000' 49 3-40-25849 57 3-40-25857 42 3-40-25842 35,400
5000-6000' 50 3-40-25850 57 3-40-25857 42 3-40-25842 34,000
6000-7000' 50 3-40-25850 57 3-40-25857 43 3-40-25843 32,600
7000-8000' 51 3-40-25851 58 3-40-25858 43 3-40-25843 31,300
8000-9000' 51 3-40-25851 58 3-40-25858 44 3-40-25844 30,100
PROPANE
Front Harman Center Harman Rear Harman Nominal Btu
Altitude Injector Part No. Injector Part No. Injector Part No. Input Rate
0-2000' 56 Standard 71 Standard 53 Standard 40,000
2000-3000' 56 Standard 71 Standard 54 3-40-25854 36,900
3000-4000' 56 Standard 71 Standard 54 3-40-25854 36,900
4000-5000' 57 3-40-25857 71 Standard 54 3-40-25854 35,400
5000-6000' 57 3-40-25857 71 Standard 55 3-40-25855 32,600
6000-7000' 57 3-40-25857 71 Standard 55 3-40-25855 32,600
7000-8000' 58 3-40-25858 71 Standard 56 3-40-25856 30,100
8000-9000' 58 3-40-25858 71 Standard 56 3-40-25856 30,100
THE CONVERSION SHALL BE CARRIED OUT
BY A MANUFACTURER'S AUTHORIZED REPRE-
SENTATIVE IN ACCORDANCE WITH THE RE-
QUIREMENTS OF THE MANUFACTURER, PRO-
VINCIAL OR TERRITORIAL AUTHORITIES HAV-
ING JURISDICTION AND IN ACCORDANCE
WITH THE REQUIREMENTS OF THE CURRENT
EDITION OF CAN/CGA-B141.1 OR CAN/CGA-
B141.2 INSTALLATION CODES.
APPENDIX B
Evaluation notes were added to the output document. To get rid of these notes, please order your copy of ePrint IV now.