Ratings
Notes:
1. Th
e 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
suffi
cient 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. Knight XL boilers require special gas venting. Use only
the vent materials and methods specifi ed in the Knight XL
Installation and Operation Manual.
4. Standard Knight XL boilers are equipped to operate from
sea level to 4,500 feet
only
with no adjustments. Th
e boiler
will de-rate by 4% for each 1,000 feet above sea level up to
4,500 feet.
5. High altitude Knight XL boilers are equipped to operate
from 3,000 to 12,000 feet
only
. Th
e boiler will de-rate by
2% for each 1,000 feet above sea level. High altitude models
are manufactured with a diff erent control module for
altitude operation, but the operation given in this manual
remains the same as the standard boilers. A high altitude
label (as shown in FIG. A) is also affi
xed to the unit.
Derate values are based on proper combustion calibration
and CO
2
’s adjusted to the recommended levels.
6. Ratings have been confi rmed by the Hydronics Section of
AHRI.
7
Maximum allowed working pressure is located on the rating plate.
NOTICE
Knight XL Boiler
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)
KBN400
80
399
373
324
KBN501
100
500
467
406
KBN601
120
600
567
493
KBN701
140
700
660
574
KBN801
160
800
752
654
Other Specifi cations
Boiler
Water
Content
Gallons
Water
Connections
Gas
Connections
Air
Size
Vent
Size
(Note 3)
3.4
1-1/2"
1"
4"
4"
4.2
1-1/2"
1"
4"
4"
4.2
2"
1"
4"
4"
5.0
2"
1"
4"
6"
5.7
2"
1"
4"
6"
Figure A High Altitude Label Location
7. Knight XL boilers comply with the requirements of CSD-1
Section CW-400 requirements as a temperature operation
control. Th
e manual reset high limit provided with the
Knight XL is listed to UL353.
Installation & Operation Manual
