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P/N 42-9551
KN Series Gas-fired direct vent cast iron boilers – Field assembly instructions
Hazard icons
You will find the following icons
throughout this manual.
(English/French)
The WARNING icon indicates
a hazard that can cause severe
personal injury, death or
substantial property damage.
The CAUTION icon indicates a
hazard that will or can cause minor
personal or property damage.
The NOTICE icon calls out special
instructions that are important, but
are not related to hazards.
Other manuals
You must read and follow this
manual, the KN Series Gas Boiler
Installation and Operating
Instructions, the KN HeatNet
Control manual and all additional
materials supplied with the boiler.
Failure to do so can result in severe
personal injury, death or substantial
property damage.
Boiler/control installa-
tion and setup
After completing assembly of the
KN boiler, follow all instructions
in the Installation and Operation
Instructions and Control Manual for
installation, start-up and testing.
Contents and information
Read before beginning the installation. . . . . . . . 5
Boiler ratings and specifications . . . . . . . . . . . . 6
Installation site preparation . . . . . . . . . . . . . . . 7
Prepare the boiler . . . . . . . . . . . . . . . . . . . . 10
Water piping. . . . . . . . . . . . . . . . . . . . . . . . 11
Gas piping . . . . . . . . . . . . . . . . . . . . . . . . . 18
Wiring a single boiler . . . . . . . . . . . . . . . . . . 20
Control setup . . . . . . . . . . . . . . . . . . . . . . . 25
Vent piping (and air piping when used) . . . . . . 28
Condensate drain line. . . . . . . . . . . . . . . . . . 29
Fill and test the system . . . . . . . . . . . . . . . . . 30
Starting the boiler . . . . . . . . . . . . . . . . . . . . 32
Annual start-up . . . . . . . . . . . . . . . . . . . . . . 41
Maintenance . . . . . . . . . . . . . . . . . . . . . . . 42
Replacement parts. . . . . . . . . . . . . . . . . . . . 46
Appendix A — suggested wiring. . . . . . . . . . . 48
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