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22
P/N 42-9551
KN Series Gas-fired direct vent cast iron boilers – Field assembly instructions
Step 58
Move the air box/blower
assembly into position
1. This procedure requires two people.
2. Move the air box/blower assembly
into position.
3. Guide the gas line into the grommet-
fitteded opening in the bottom of the
air box.
Step 59
Attach the air box/blower
assembly to the manifold blower
flange
1. Use the nuts provided to secure the
assembly to the manifold blower
flange.
Step 60
Tighten gas line nipple
clamps and gas train clamp
1. Securely tighten the gas line nipple
clamps.
2. Tighten the gas train U-clamp.
Step 61
Connect air box pressure
switch sensing tube
1. Remove the air pressure sensing tube
from the air box.
2. The air box pressure switch is
mounted on the lower center of the
jacket front panel.
3. Connect the tube to the air pressure
switch and to the hose barb on the
bottom of the air box.