Install Instructions (Venting)

Part number 550-100-103/1110
GAS-FIRED WATER BOILER — Manual addendum — Venting
A–24
DIRECT EXHAUST — Sidewall — Figure 29
termination assembly — all parts by installer
1 Vent piping
2 Cover plates
3 Galvanized thimble
4 Vent termination elbow
5 Bird screen
Locate termination so it is not likely to be damaged by foreign 8.
objects, such as stones or balls, or subject to buildup of leaves or
sediment.
Do not connect any other appliance to the vent pipe. Do not con-9.
nect multiple boilers to a common vent pipe.
Completing the vent piping
Install vent penetration as explained in the following before install-1.
ing vent piping from the boiler to the termination.
Insert piping from boiler vent connections, then attach exterior 2.
termination piping.
Follow instructions beginning on 3. page A-27 to complete piping
from boiler to termination.
Multiple vent terminations
When terminating multiple direct exhaust Ultra boilers, terminate 1.
each vent connection as described in this manual for individual
vents. Space terminations as required for best installation practices
and required maintenance.
Prepare wall penetrations
Wall penetration:1.
Cut a rough opening large enough to clear the diameter of the a.
metal thimble used.
Provide metal cover plates (item 2, b. Figure 29). The outer plate
MUST provide a stop to prevent the vent elbow from being
pushed inward. (See NOTICE at right.) Hole diameters in the
metal plates must be:
2-inch PVC, CPVC or ABS — 2s
1
⁄2” hole diameter.
3-inch PVC, CPVC or ABS — 3s
5
⁄8” hole diameter.
4-inch PVC, CPVC or ABS — 4s
5
⁄8” hole diameter.
AL29-4C vent pipe and elbow — size hole large enough s
to clear vent pipe, but small enough to prevent the elbow
from being pushed through.
Insert the galvanized metal thimble (by installer) in the vent c.
pipe hole as shown in Figure 29.
Follow all local codes for isolation of vent pipe when passing 2.
through floors or walls.
Termination and fittings
Prepare the vent termination elbow (1. Figure 26, page A-23) by in-
serting a bird screen. Bird screens are not supplied with the Ultra
boiler. Purchase separately from Weil-McLain.
You can install the vent termination using either of the configura-2.
tions shown in Figure 26, page A-23.
Maintain the required dimensions of the finished termination 3.
piping as shown in Figure 26, page A-23.
Seal exterior openings thoroughly with exterior caulk.4.
Do not extend exposed vent pipe outside of the building more 5.
than shown in this document. Condensate could freeze and block
vent pipe.
DIRECT EXHAUST — Sidewall (continued)
The Weil-McLain sidewall termination kit sup-
plied with each boiler includes metal plates with
two openings. These plates can be trimmed and
used for direct exhaust vent termination cover
plates when the vent diameter used matches
the hole size in the plates provided with the
boiler.