Install Instructions (Venting)

Part number 550-100-103/1110
GAS-FIRED WATER BOILER — Manual addendum — Venting
A–26
DIRECT EXHAUST — Vertical (continued)
DIRECT EXHAUST — Vertical terminationFigure 31
Prepare roof penetration
Vent pipe penetration:1.
Cut a hole for the vent pipe. For either combustible a.
or noncombustible construction, size the vent pipe
hole at least 0.5” larger than the vent pipe diam-
eter:
3” hole for 2” PVC.s
4” hole for 3” PVC.s
5” hole for 4” PVC.s
Insert a galvanized metal thimble in the vent pipe b.
hole.
Follow all local codes for isolation of vent pipe when 2.
passing through floors, ceilings and roofs.
Provide flashing and sealing boots sized for the vent 3.
pipe and air pipe.
Termination and fittings
Prepare the vent termination coupling (1. Figure 31) by
inserting a bird screen. Bird screens are not supplied
with the Ultra boiler. Purchase separately from Weil-
McLain.
The vent piping must terminate in a coupling as shown 2.
in Figure 31.
Maintain the required dimensions of the finished ter-3.
mination piping as shown in Figure 31.
Do not extend exposed vent pipe outside of building 4.
more than shown in this document. Condensate could
freeze and block vent pipe.
Multiple vent terminations
When terminating multiple Ultra boilers, terminate 1.
each vent connection as described in this section. Space
terminations as required for best installation practices
and required maintenance.
Complete termination preparation
Install vent terminations before proceeding. See previous 2.
pages for instructions.
Installing direct exhaust vent piping
For reference in the following see:1.
Sidewall terminations: see a. Figure 25, page A-22.
Vertical terminations: see b. Figure 30, page A-25.
Work from the boiler to vent or air termination. Do not 2.
exceed the lengths given in the previous pages for either
the air or vent piping.
As shown in the maximum length tables, the Ultra-a.
80 or Ultra-105 may be installed with either 2-inch
or 3-inch vent piping.
As shown in the maximum length tables, the Ultra-b.
230 may be installed with either 3-inch or 4-inch
vent piping.
You must install appropriate pipe reducers, where c.
required, at the boiler vent connection.
See 3. Figure 32 for attaching vent and air pipes at the boiler.
Cut pipe to required lengths.4.
Sidewall terminations: The vent pipe must extend
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.
Deburr inside and outside of pipe ends.5.
Chamfer outside of each pipe end to ensure even cement distribu-6.
tion when joining.
Clean all pipe ends and fittings. Dry thoroughly.7.
Dry assemble entire vent or air piping to ensure proper fit before 8.
assembling any joint.
For each joint:9.
Handle fittings and pipes carefully to prevent contamination a.
of surfaces.
Apply primer liberally to both joint surfaces — pipe end and b.
fitting socket.
While primer is still damp, lightly apply approved cement to c.
both surfaces in a uniform coating.
Apply a second coat to both surfaces. Avoid using too much d.
cement on sockets to prevent cement buildup inside.
With cement still wet, insert pipe into fitting, twisting ¼ turn. e.
Make sure pipe is fully inserted.
Wipe excess cement from joint. Check joint to be sure a smooth f.
bead of cement shows around the entire joint.
Install pipe supports as shown in 10. Figure 11, page A-10 or Fig-
ure 14, page A-13.
Slope vent and air piping continuously toward boiler, with at least 11.
1/4 inch drop per foot of run. Do not allow sags at any point.
Maintain minimum clearance of 12. 6QE inch between vent pipe and
any combustible wall or material.
Seal wall or floor penetration openings following local code re-13.
quirements.