23
P/N 42-9551
KN Series Gas-fired direct vent cast iron boilers – Field assembly instructions
Step 62
Install gas valve by-pass
line
De-burr the aluminum tub-
ing after cutting to ensure the
ends are not obstructed.
1. Connect an aluminum tube (sup-
plied with boiler, but cut to length
during installation) from the gas valve
by-pass outlet port to the gas valve
by-pass inlet port (rear of valve).
Step 63
Connect gas valve air box
sensor line
De-burr the aluminum tub-
ing after cutting to ensure the
ends are not obstructed.
1. Connect an aluminum tube to the
bottom of the gas valve (PL-AIR tap-
ping).
2. Connect the other end of the tubing
to the brass fitting on the bottom of
the air box.
Step 64
Connect pilot gas line
De-burr the aluminum tub-
ing after cutting to ensure the
ends are not obstructed.
1. The pilot gas line aluminum tube
must connect from the pilot gas valve
on the front of the boiler to the pilot
orifice assembly on the top of the
manifold (top rear).
2. Cut the tube with extra slack to en-
sure it will be long enough after the
jacket side panel is installed.
3. Route the tubing through the hole in
the front jacket panel.
4. Connect the tubing to the pilot gas
valve (at front of boiler).
5. Leave the other end of the tube loose.
Step 65
Apply right side jacket
insulation
Use of an approved dust
respirator is strongly recom-
mended when handling the
insulating components of the
boiler.
1. Press the right side insulation into
place.
2. Make sure to position the insulation
UNDER the pilot gas line tubing.
3. Cut the pilot gas tubing if necessary,
then attach to the pilot orifice assem-
bly at the top rear of the manifold.
