Specifications

29
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
lled out and afxed 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 3-40-64347 56 3-40-57356 39 3-40-64739 40,000
2000-3000' 48 male 56 3-40-57356 40 male 38,400
3000-4000' 49 male 56 3-40-57356 41 male 36,900
4000-5000' 49 male 57 male 42 male 35,400
5000-6000' 50 male 57 male 42 male 34,000
6000-7000' 50 male 57 male 43 male 32,600
7000-8000' 51 male 58 male 43 male 31,300
8000-9000' 51 male 58 male 44 male 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 3-40-57356 71 3-40-57271 53 3-40-57753 40,000
2000-3000' 56 3-40-57356 71 3-40-57271 54 male 36,900
3000-4000' 56 3-40-57356 71 3-40-57271 54 male 36,900
4000-5000' 57 male 71 3-40-57271 54 male 35,400
5000-6000' 57 male 71 3-40-57271 55 male 32,600
6000-7000' 57 male 71 3-40-57271 55 male 32,600
7000-8000' 58 male 71 3-40-57271 56 3-40-57356 30,100
8000-9000' 58 male 71 3-40-57271 56 3-40-57356 30,100
THE CONVERSION SHALL BE CARRIED OUT
BY A MANUFACTURER'S AUTHORIZED REP-
RESENTATIVE IN ACCORDANCE WITH THE
REQUIREMENTS OF THE MANUFACTURER,
PROVINCIAL OR TERRITORIAL AUTHORITIES
HAVING 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
* When ordering injectors that have no Harman
part number, specify MALE or FEMALE and the
appropriate 2 digit injector number.
This appliance has been converted for use at an altitude of __________ft.
Orice Sizes: Front ________ Center_________ Rear ________
Input (Btu/hr) _________________
Manifold Pressure __________________
Fuel Type _______________________
Converted By _________________________________
Date of Conversion _______________________________