Weil-McLain ULTRA299-S4 Manual page 90

S 4
®
ERIES
DIRECT EXHAUST — Vertical
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 fl oors, ceilings and roofs.
3. Provide fl ashing and sealing boots sized for the vent
pipe and air pipe.
Termination and fi ttings
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 Weil-McLain.
2. The vent piping must terminate in a coupling as shown
in Figure 103 .
3. Maintain the required dimensions of the fi 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.
Complete termination preparation
2. Install vent terminations before proceeding. See previous
pages for instructions.
Installing direct exhaust vent piping
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 for attaching vent and air pipes at the
boiler.
4. Cut pipe to required lengths.
90
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GAS FIRED WATER BOILER
— Boiler Manual
(continued)
DIRECT EXHAUST — Vertical termination
through the outer cover plate only enough to install
the termination elbow. The 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 fi ttings. Dry thoroughly.
8. Dry assemble entire vent or air piping to ensure proper fi t
before assembling any joint.
9. For each joint:
a. Handle fi ttings and pipes carefully to prevent contamina-
tion of surfaces.
b. Apply primer liberally to both joint surfaces — pipe end
and fi 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 fi 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
and any combustible wall or material.
13. Seal wall or fl oor penetration openings following local code
requirements.
: The vent pipe must extend
inch between vent pipe
3/16
Part number 550-100-400/0717