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C. Assembly of U.S. Boiler 60/100mm Concentric Venting
1) Concentric vent components supplied with the boiler are packed inside the boiler carton and include the following:
a) 80/125 x 60/100mm reducing elbow (P/N 101005-01).
b) 60/100mm terminal section (straight section with a terminal and overall length of 27 3/4” (P/N 101006-01).
c) (2) Rubber wall grommets (P/N 101007-01).
2) Start by attaching the reducing elbow to the boiler collar. To do so, remove the clamp from the large end of the reducing
elbow and set aside. Apply a small amount of water to the brown gasket on the boiler collar. Push the elbow onto the
boiler collar until the bead on the elbow contacts the top edge of the collar (Figure 7.10).
3) Reinstall the clamp removed in Step (2) so that the elbow is secured to the boiler collar.
4) If no additional sections of concentric pipe are required, attach the terminal section to the elbow. In most cases, it will
need to be cut before doing so. Use the following procedure to cut the pipe:
a) Measure distance “L” from the outside surface of the exterior wall to the end of the elbow as shown in Figure 7.11.
b) Add 2-1/8” to distance “L”. Carefully mark this length on the pipe as shown in Figure 7.12.
c) Press in the two tabs holding the plastic terminal in the terminal section (Figure 7.12). Carefully pull out the terminal
and the inner pipe.
d) Cut the outer pipe only at the point marked in Step (b) using aviation shears, a hacksaw, or an abrasive wheel cutter.
Be careful to cut the pipe square. De burr the cut end with a fi le or emory cloth.
e) Cut the plastic inner pipe so that it will protrude 3/8” beyond the outer pipe when reinstalled in the terminal section
(Figure 7.13). Use a fi ne tooth hacksaw or a PVC saw to cut the plastic pipe and be careful to cut the pipe square. De
burr the cut edge of the plastic pipe with a fi le, razor blade, or fi ne sandpaper.
f) Reinstall the inner pipe in the terminal section. Slip the outside wall grommet over the terminal section and position
so that it covers the joint between the outer pipe and the terminal (Figure 7.14).
g) Make a mark on the terminal section 1” from the cut end of the outer pipe as shown in Figure 7.14.
h) Pass the terminal section through the wall from the outside. Push the remaining wall grommet over the terminal
section on the inside of the wall. Push the terminal section into the elbow until the mark made in Step (g) is no longer
visible. If necessary, the brown gasket in the inner pipe may be lubricated with a few drops of water.
i) The terminal section must be attached to the elbow with a single #10 x 1/2” sheet metal screw ( not supplied) at the
top of the elbow. Drill a 1/8” hole in the location shown in Figure 7.15. Use a short drill bit or a drill stop to ensure
that the drill bit does not penetrate the pipe by more than 3/8”. Install a #10 x 1/2” screw in this hole. Do not use a
screw longer than 1/2” long.
j) If not already done, make sure that both wall grommets are fi rmly against the interior and exterior wall surfaces. Seal
any cracks or other openings near the terminal through which exhaust could enter the building.
5) If additional pieces of pipe are used, install them starting at the boiler elbow. Support each section of straight pipe at its
female end.
WARNING
Failure to follow the instructions could result in fl ue gas leakage into the combustion air or indoor
air, resulting in unsafe or unreliable operation
• Do not lubricate concentric gaskets with anything other than water.
• Do not attempt to cut any piping except as permitted in this section. When cutting these
sections, make sure all cuts are square and allow for proper insertion.
• Do not attempt to try to mix this concentric pipe with other venting systems.
NEVER COMMON VENT A FCM BOILER WITH OTHER APPLIANCES