AERCO AM Series Boiler User Manual - Manual (Page 67)

AM Series Boilers and Water Heaters
CHAPTER 3 – INSTALLATION
OMM-0100_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 67 of 156
GF-146
Ph.: 800-526-0288 PRI - 07/14/14
3.16.5.5 Combustion Air and Ventilation Openings
Outdoor combustion air shall be provided through opening(s) to the outdoors.
WARNING!
Make sure that combustion air and ventilation openings are
sufficiently sized and no reduction or closure of openings takes
place.
3.16.5.6 Two Permanent Openings Method
Two permanent openings, one commencing within 12 inches (300 mm) of the top and one
commencing within 12 inches (300 mm) of the bottom, of the room shall be provided. The
openings shall communicate directly, or by ducts, with the outdoors or spaces that freely
communicate with the outdoors, as follows:
• Where directly communicating with the outdoors or where communicating to the outdoors
through vertical ducts, each opening shall have a minimum free area of 1 in 2 each 4000
Btu/hr (550 mm 2 /kW) of total input rating of all appliances located in the room.
• Where communicating with the outdoors through horizontal ducts, each opening shall have
a minimum free area of 1 in
2
each 2000 Btu/hr (1100 mm
2
/kW) of total input rating of all
appliances located in the room.
3.16.5.7 One Permanent Opening Method
One permanent opening, commencing within 12 inches (300 mm) of the top of the room, shall
be provided. The appliances shall have clearances of at least 1 inch (25 mm) from the sides and
back and 6 inches (150 mm) from the front of the appliance. The opening shall directly
communicate with the outdoors or shall communicate through a vertical or horizontal duct to the
outdoors or spaces that freely communicate with the outdoors and shall have a minimum free
area of 1 in
2 each 3000 Btu/hr (700 mm 2 /kW) of the total input rating of all appliances located in
the room.
3.16.5.8 Determining Vent Termination Location
Locate the vent termination using the following guidelines:
1. The total length of piping for vent must not exceed the limits given in Section 3.16.3.
2. You must consider surrounding factors when terminating the vent, such as:
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.