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Appendix B: De-rating for High Altitude
For U.S. installations, the Clarity Fireplace Insert
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 num-
bers the appropriate injectors for both LP and natu-
ral gas at various altitudes.
For Canadian installations, the Clarity Fireplace
Insert is approved for elevations up to 1370 meters
(4500 feet).
For high altitude installations above 1370 meters (4500
feet), consult the local gas distributor or the authority
having jurisdiction for proper rating methods.
NOTE: The difference in altitude derating require-
ments for the U.S. and Canada is simply a result of dif-
ferences in testing standards between the two coun-
tries.
If the installer must convert the unit to adjust for vary-
ing altitudes, an information sticker like the one below
must be filled out and affixed to the appliance at the
time of conversion.
THE CONVERSION SHALL BE CARRIED OUT
BY A MANUFACTURER'S AUTHORIZED REP-
RESENTATIVE IN ACCORDANCE WITH THE
REQUIREMENTS OF THE MANUFACTURER,
PROVINCIAL OR TERRITORIAL AUTHORI-
TIES HAVING JURISDICTION AND IN AC-
CORDANCE WITH THE CURRENT EDITION
OF THE REQUIREMENTS OF THE CAN/CGA-
B141.1 OR CAN/CGA-B141.2 INSTALLATION
CODES.
LA CONVERSION DOIT ETRE EFFECTUÉE
CONFORMÉMENT AUX RÉGLEMENTATION
PROVINCIAUX EN CAUSE ET AUX
EXIGENCES DES CODES D'INSTALLATION
CAN/CGA-B149.
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 44 Standard 40,000
2000-3000' 47 3-40-25848 56 Standard 45 3-40-25840 38,400
3000-4000' 48 3-40-25849 56 Standard 45 3-40-25841 36,900
4000-5000' 49 3-40-25849 56 3-40-25857 46 3-40-25842 35,400
5000-6000' 49 3-40-25850 57 3-40-25857 47 3-40-25842 34,000
6000-7000' 50 3-40-25850 57 3-40-25857 47 3-40-25843 32,600
7000-8000' 50 3-40-25851 58 3-40-25858 48 3-40-25843 31,300
8000-9000' 51 3-40-25851 58 3-40-25858 48 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' 57 Standard 71 Standard 55 Standard 40,000
2000-3000' 59 Standard 71 Standard 55 3-40-25854 36,900
3000-4000' 57 Standard 71 Standard 56 3-40-25854 36,900
4000-5000' 58 3-40-25857 71 Standard 56 3-40-25854 35,400
5000-6000' 59 3-40-25857 71 Standard 56 3-40-25855 32,600
6000-7000' 59 3-40-25857 71 Standard 57 3-40-25855 32,600
7000-8000' 60 3-40-25858 71 Standard 57 3-40-25856 30,100
8000-9000' 61 3-40-25858 71 Standard 58 3-40-25856 30,100
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