Install Instructions

8
Ratings
Maximum allowed working pressure is located on the rating plate.
NOTICE
Copper-fin
AHRI Rating
Model Number
Note: Change “N” to
“L” for L.P. gas models.
Input MBH
(Note 4)
Min Max
Gross
Output
MBH
(Note 1)
Net
AHRI
Ratings
Water,
MBH
(Note 2)
CBN497 250 495 401 349
CBN647 350 645 522 454
CBN747 350 745 603 524
CBN987 360 985 798 694
CBN1257
720 1255 1017 884
CBN1437
720 1435 1162 1010
CBN1797
720 1795 1454 1264
CBN2067
990 2065 1673 1455
Other Specifications
Boiler Water
Content
Gallons
Water
Connections
Gas
Connections
Vent Size
(Note 3)
1.9 2" 1 1/4" 6"
2.0 2" 1 1/4" 8"
2.4 2" 1 1/4" 8"
3.3 2 1/2" 2" 10"
3.5 2 1/2" 2" 12"
3.7 2 1/2" 2" 12"
4.1 2 1/2" 2" 14"
4.3 2 1/2" 2" 14"
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.
Figure A High altitude label location_boiler
HIGH ALT
IT
ITUDE
LABEL
Installation & Service Manual