Install Instructions

Ratings
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
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. The 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 with no fi eld adjustments.
The boiler will de-rate by 2% for each 1,000 feet above
3,000 feet. High altitude models are manufactured with
a different 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.
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
UNIT EQUIPPED FOR
3000 FT. TO 12,000 FT.
HIGH ALTITUDE
7. Knight XL boilers comply with the requirements of CSD-1
Section CW-400 requirements as a temperature operation
control. The manual reset high limit provided with the
Knight XL is listed to UL353.
Installation & Operation Manual