AERCO AM Series Boiler User Manual - Manual (Page 69)

AM Series Boilers and Water Heaters
CHAPTER 3 – INSTALLATION
OMM-0100_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 69 of 156
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3.16.5.9 Sidewall Termination - Two pipes
Installation must comply with local requirements and with the National Fuel Gas Code, ANSI
Z223.1 for U.S. installations or CSA B149.1 for Canadian installations.
CAUTION!
A gas vent extending through an exterior wall shall not terminate
adjacent to a wall or below building extensions such as eaves,
parapets, balconies, or decks.
3.16.5.10 Determining Location of Sidewall Two-pipe Termination
Locate the vent/air terminations using the following guidelines:
1. The total length of piping for vent or air must not exceed the limits given in Section 3.16.3.
2. You must consider the surroundings when terminating the vent and air:
a) Position the vent termination where vapors will not damage nearby shrubs, plants or air
conditioning equipment or be objectionable.
b) The flue products will form a noticeable plume as they condense in cold air. Avoid areas
where the plume could obstruct window views.
c) Prevailing winds could cause freezing of condensate and water/ice buildup where flue
products impinge on building surfaces or plants.
d) Avoid possibility of accidental contact of flue products with people or animals
e) Do not locate the terminations where wind eddies could affect performance or cause
recirculation, such as inside building corners, near adjacent buildings or surfaces, window
wells, stairwells, alcoves, courtyards, or other recessed areas.
f) Do not terminate above any door or window. Condensate can freeze, causing ice
formations.
g) Locate or guard vent to prevent condensate damage to exterior finishes.
3. The air piping must terminate in a down-turned elbow as shown in Figure 3-31. This
arrangement avoids recirculation of flue products into the combustion air stream.
4. The vent piping must terminate in an elbow pointed outward or away from the air inlet, as
shown in Figure 3-31.
CAUTION!
Do not exceed the maximum lengths of the outside vent piping
shown in Figure 3-31
. Excessive length exposed to the outside
could cause freezing of condensate in the vent pipe, resulting in
potential appliance shutdown.