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Ratings
Model Number
Input
Note: Change "N" to
"L" for L.P. gas models.
Min
CBN497
250
CBN647
350
CBN747
350
CBN987
360
720
CBN1257
CBN1437
720
720
CBN1797
CBN2067
990
Maximum allowed working pressure is located on the rating plate.
NOTICE
Notes:
1. The ratings are based on standard test procedures
prescribed by the United States Department of Energy.
2. Net AHRI ratings are based on net installed radiation of
sufficient quantity for the requirements of the building
and nothing need be added for normal piping and pickup.
Ratings are based on a piping and pickup allowance of 1.15.
3. Copper-fins require special gas venting. Use only the vent
materials and methods specified in the Installation and
Service Manual.
4. The Copper-fin is orificed for operation up to 2000
feet altitude. The ap pli ance will be derated 4% per 1000
feet above 2000 feet el e va tion. Consult the factory for
installations above 2000 feet elevation.
5. Ratings have been confirmed by AHRI.
8
Copper-fin
AHRI Rating
Gross
MBH
Output
MBH
(Note 4)
Max
(Note 1)
495
401
645
522
745
603
985
798
1255
1017
1435
1162
1795
1454
2065
1673
Installation & Service Manual
Other Specifications
Net
AHRI
Boiler Water
Ratings
Content
Water,
Gallons
MBH
(Note 2)
1.9
349
454
2.0
524
2.4
694
3.3
884
3.5
1010
3.7
1264
4.1
1455
4.3
Figure A High altitude label location_boiler
Vent Size
Water
Gas
Connections
Connections
(Note 3)
2"
1 1/4"
2"
1 1/4"
2"
1 1/4"
2 1/2"
2"
2 1/2"
2"
2 1/2"
2"
2 1/2"
2"
2 1/2"
2"
HIGH ALTIT ITUDE
LABEL
6"
8"
8"
10"
12"
12"
14"
14"
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