Weil-McLain Evergreen EVG 70 Manual page 29

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DIRECT VENT —
2. Place wall penetrations to obtain minimum clearances shown in
Figure 27 for U. S. installations. For Canadian installations, provide
clearances required by CSA B149.1 or B149.2 Installation Code and
a ULC S636 compliant vent kit.
3. The air inlet of a boiler is part of a direct vent connection. It is
not classifi ed as a forced air intake with regard to spacing from
adjacent boiler vents.
Prepare wall pe netrations
1. Air pipe penetration:
a. Cut a hole for the air pipe. Size the air pipe hole as close as
desired to the air pipe outside diameter.
2. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combustible or
noncombustible construction, size the vent pipe hole at least
0.4" larger than the vent pipe diameter.
b. Insert a corrosion resistant metal thimble in the vent pipe hole
as shown in Figure 28 .
3. Use the provided paper template for correct location of hole centers.
4. Use of a sidewall termination plate is REQUIRED.
a. Kits for several vent sizes are available from Weil-McLain.
See "VENT/AIR PARTS AND KITS" on page 127 .
b. Plate may be fi eld fabricated from corrosion resistant material
of suffi cient strength. Plate must allow venting to maintain
minimum clearance to combustibles.
Ensure that the plate material is strong enough to prevent
the termination from being pushed inward if struck or
pushed from the outside.
5. Follow all local codes for isolation of vent pipe when passing
through fl oors or walls.
6. Seal exterior openings thoroughly with exterior caulk.
Termination and fi ttings
1. Prepare the vent termination elbow and the air termination elbow
by inserting bird screens. (See Figure 26, page 28 .) Bird screens
must be purchased separately. See the parts list at the end of this
manual for part numbers.
2. Secure the elbows so they will butt against the sidewall termination
plate.
3. When completed, the air termination coupling must be oriented
at least 12 inches below the vent termination and at least 12 inches
above grade or snow line as shown in Figure 26, page 28 .
4. You can orient the vent termination elbow either directly
outward or 90 degrees away from the air inlet elbow as shown in
Figure 26, page 28 .
5. Maintain the required dimensions of the fi nished termination
piping as shown in Figure 26, page 28 .
6. For multiple boiler terminations, see Figure 27 .
7. Do not extend exposed vent pipe outside of building more than
shown in this document. Condensate could freeze and block vent
pipe.
If extending the vent and air pipes out from the wall,
install a coupling on each pipe. Mount the piping with
the coupling fl ush with the outer plate.
Part number 550-100-191/0917
as-fired water boiler —
Sidewall with separate pipes
See notices on previous page.
Boiler Manual
70/110/155
Figure 27 Multiple separate pipes sidewall terminations
— maintain vertical spacing between vent and
air fi ttings shown in Figure 26, page 28
Figure 28
Sidewall termination assembly — using
separate pipes
1 Vent piping
2 Air piping
3 Sidewall termination plates: for 3" PVC,
use plates supplied with boiler in W-M
vent/air plate kit; for 3" AL29-4C or 2" PVC,
purchase optional sidewall separate pipes
plate kit
(continued)
4 Corrosion resistant thimbles,
by installer
5 Bird screen, by installer
6 Air inlet elbow
7 Elbow
8 Nipple
9 Elbow (vent termination)
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