Weil-McLain Evergreen EVG 220 Manual page 37

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gas
DIRECT VENT — Vertical vent / sidewall air
Determine location for air inlet elbow
1. The air inlet of an Evergreen boiler is part of a direct vent con-
nection. It is not classified as a forced air intake with regard to
spacing from adjacent appliance terminations.
2. Locate the air inlet elbow (termination) using the following
guidelines.
3. The air piping must terminate in a down-turned elbow as shown
in Figure 45.
a. Apply the configuration on the left side of Figure 45 unless
the terminations would fail to meet minimum clearance to
grade or snow line.
b. Apply the configuration on the right side of Figure 45 when
the terminations need to be raised higher to meet clearance
to grade or snow line.
c. The air pipe may run up the side of the building, as shown.
The vent and air pipes must be secured with braces, and all
clearances and lengths must be maintained. Space braces no
further than 24 inches apart.
4. You must consider the surroundings when terminating the air
connection:
a. Make sure there are no obstructions for air flow. DO NOT
locate the termination where plants could grow and cause
obstruction to air flow.
b. Do not locate the terminations where wind eddies could af-
fect performance or cause recirculation with exhaust from
other appliances, such as inside building corners, near adja-
cent buildings or surfaces, window wells, stairwells, alcoves,
courtyards or other recessed areas.
c. Locate the air inlet termination at least 12 inches below and 12
inches horizontally from any appliance or building vent outlet.
5. Locate terminations so they are not likely to be damaged by
foreign objects, such as stones or balls, or subject to buildup of
leaves or sediment.
Multiple air terminations
1. When terminating multiple Evergreen boiler air connections,
terminate each air connection as described in this manual.
2. Place wall penetrations to obtain minimum clearances as in-
structed in this manual.
3. Place adjacent air inlets for multiple Evergreen boilers at least
6 inches apart.
4. For Canadian installations, provide clearances required by Natu-
ral Gas and Propane Installation CAN/CSA B149.1 or B149.2
Installation Code.
5. Combustion air (NOT vent piping) can be manifolded as shown
in the Evergreen Advanced manual.
Prepare wall penetrations
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. Seal exterior openings thoroughly with exterior caulk.
Termination and fittings
1. Prepare the air termination elbow (Figure 45) by inserting a bird
screen. Bird screens must be purchased separately. See the parts
list at the end of this manual for part numbers.
2. Use metal plates (by installer) at inside and outside penetrations
using the method shown in Figure 29, page 26.
If extending the air pipe out from the wall, install a cou-
pling on each pipe. Mount the piping with the coupling
flush with the outer plate.
Part number 550-100-131/0120
-
fired water boiler
— 220/299/300/399 Boiler Manual
Figure 44
Figure 45
(continued)
Vent termination (through the roof) for
direct vent: vertical vent / sidewall air
Sidewall air inlet (termination) for direct
vent: vertical vent / sidewall air
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