Ultra Boiler Manual

Part number 550-100-440/0122
90
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Figure 103 DIRECT EXHAUST — Vertical termination
Prepare roof penetration
1. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combustible
or noncombustible construction, size the vent pipe
hole at least 0.5” larger than the vent pipe diameter:
• 3” hole for 2”
• 4” hole for 3”
• 5” hole for 4”
b. Insert a galvanized metal thimble in the vent pipe
hole.
2. Follow all local codes for isolation of vent pipe when
passing through oors, ceilings and roofs.
3. Provide ashing and sealing boots sized for the vent
pipe and air pipe.
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1. Prepare the vent termination coupling (Figure103) by
inserting a bird screen. Bird screens are not supplied
with the Ultra boiler. Purchase separately from WM
Technologies.
2. e vent piping must terminate in a coupling as shown
in Figure103.
3. Maintain the required dimensions of the nished ter-
mination piping as shown in Figure103.
4. Do not extend exposed vent pipe outside of building
more than shown in this document. Condensate could
freeze and block vent pipe.
Multiple vent terminations
1. When terminating multiple Ultra boilers, terminate
each vent connection as described in this section. Space
terminations as required for best installation practices
and required maintenance.
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2. Install vent terminations before proceeding. See previous
pages for instructions.
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
1. For reference in the following see:
a. Sidewall terminations: see Figure97,page86.
b. Vertical terminations: see Figure102,page89.
2. Work from the boiler to vent or air termination. Do not
exceed the lengths given in the previous pages for either
the air or vent piping.
a. As shown in the maximum length tables, the
Ultra-80 or Ultra-105 may be installed with either
2-inch or 3-inch vent piping.
b. As shown in the maximum length tables, the
Ultra-230 may be installed with either 3-inch or
4-inch vent piping.
c. You must install appropriate pipe reducers, where
required, at the boiler vent connection.
3. See Figure104,page91 for attaching vent and air pipes
at the boiler.
4. Cut pipe to required lengths.
Sidewall terminations: e vent pipe must extend
through the outer cover plate only enough to install
the termination elbow. e plate must provide a stop
to prevent the vent elbow from being pushed inward.
5. Deburr inside and outside of pipe ends.
6. Chamfer outside of each pipe end to ensure even cement dis-
tribution when joining.
7. Clean all pipe ends and ttings. Dry thoroughly.
8. Dry assemble entire vent or air piping to ensure proper t before
assembling any joint.
9. For each joint:
a. Handle ttings and pipes carefully to prevent contamina-
tion of surfaces.
b. Apply primer liberally to both joint surfaces — pipe end
and tting socket.
c. While primer is still damp, lightly apply approved cement
to both surfaces in a uniform coating.
d. Apply a second coat to both surfaces. Avoid using too much
cement on sockets to prevent cement buildup inside.
e. With cement still wet, insert pipe into tting, twisting ¼
turn. Make sure pipe is fully inserted.
f. Wipe excess cement from joint. Check joint to be sure a
smooth bead of cement shows around the entire joint.
10. Install pipe supports as shown in Figure105,page92 or
Figure106,page92.
11. Slope vent and air piping continuously toward boiler, with at
least 1/4inch drop per foot of run. Do not allow sags at any
point.
12. Maintain minimum clearance of 3/16 inch between vent pipe
and any combustible wall or material.
13. Seal wall or oor penetration openings following local code
requirements.