16
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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