9
P/N 42-9551
KN Series Gas-fired direct vent cast iron boilers – Field assembly instructions
Step 16
Install baffle
Do not use baffles if they
have been broken, cracked,
folded or frayed. Obtain re-
placements before proceed-
ing with the boiler assembly.
1. Before adding additional sections,
install a baffle in the flueway as in
Step 5, page 6 and Step 6, page 6.
2. Place a baffle in the heat pin area of
the front section as shown.
3. The cut-off corner must go to the
lower right.
4. Press into place.
5. Make sure the baffle does NOT
overlap onto the perimeter surfaces
of the section. This would prevent the
section from drawing up correctly.
Step 17
Use 2x4 and mallet
1. To initially seat the push nipple into
the next section, rap with a mallet
and 2x4 at each nipple port.
2. Repeat, alternating from right nipple
port to left to avoid cocking the push
nipples.
Step 18
Install draw rods
The draw rods ARE NOT
used to pull the sections
together, only to keep them
firmly in position.
1. When the section assembly is com-
pleted, slide a draw rod through each
of the four draw rod holes.
2. Apply a washer and nut on each end
and pull up finger tight.
Step 19
Use a torque wrench
DO NOT exceed 30 foot-
pounds when tightening
nuts. Higher torque could
cause breakage of the cast
iron.
1. Use a torque wrench to tighten the
nuts on the draw rods.
2. Start with the upper left corner rod
first.
3. Tighten the nut to 15 foot-pounds.
4. Move to the lower right rod. Tighten
the nut to 15 foot-pounds.
5. Repeat with the lower left, then the
upper right rod, both tightened to
15 foot pounds.
6. Repeat this sequence again, but finish
the tightening to 30 foot-pounds for
each nut.
