Installation Instructions

Installation & Operation Manual
Ratings
Notes:
1. The ratings are based on standard test procedures
prescribed by the United States Department of Energy.
2. Net I=B=R 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. Knight XL boilers require special gas venting. Use only the
vent materials and methods specified in the Knight XL
Installation and Operation Manual.
4. Standard Knight XL boilers are equipped for operation up
to 4,500 feet with no field adjustments. Output ratings will
be reduced by 4% for each 1,000 feet above sea level up to
4,500 feet only.
5. High altitude Knight XL boilers will have a high altitude
label affixed to the unit (as shown in FIG. A) and are
equipped for operation of 4,501 feet to 12,000 feet only
with no field adjustments. For high altitude models,
output ratings will be reduced by 2% for each 1,000 feet
above sea level.
High altitude models have a different control module for
altitude operation, but the operation given in this manual
for standard models remains the same.
6. Ratings have been confirmed by the Hydronics Institute,
Division of AHRI.
7
Maximum allowed working pressure is located on the rating plate.
NOTICE
Knight XL Boiler
I=B=R 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
I=B=R
Ratings
Water,
MBH
(Note 2)
KBN399 80 399 373 324
KBN500 100 500 467 406
KBN600 120 600 567 493
KBN700 140 700 660 574
KBN800 160 800 752 654
Other Specifications
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
3,000 FT. TO 12,000 FT.
HIGH ALTITUDE