RBI Boiler, Installation And Operation Instructions Manual

Page: 73 / 154

73
3000 Btu/hr (700 mm2 /kW) of the total
input rating of all appliances located in
the room
11.10.2 - Determine
location
Locate the vent termination using the
following guidelines:
1. The total length of piping for vent must
not exceed the limits given in the
Section 11.4.
2. You must consider the surroundings
when terminating the vent:
a. Position the vent termination where
vapors will not damage nearby
shrubs, plants or air conditioning
equipment or be objectionable.
b. The fl ue 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 fl ue products
impinge on building surfaces or
plants.
d. Avoid possibility of accidental
contact of fl ue 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
fi nishes.
3. The vent piping must terminate in an
elbow pointed outward as shown in
Figures 11-15 or 11-16.
WARNING!!!
Do not
exceed the maximum lengths
of the outside vent piping
shown in Figures 11-15 or 11-16.
Excessive length exposed to the
outside could cause freezing
of condensate in the vent pipe,
resulting in potential heater
shutdown.
4. Maintain clearances as expected
by “Venting of Equipment,” of the
National Fuel Gas Code, ANSI
Z223.1/NFPA 54, or “Venting Systems
and Air Supply for Appliances” of the
Natural Gas and Propane Installation
Code, CAN/CSA B149.1, or applicable
provisions of the local building codes.
Also maintain the following:
a. Vent must terminate:
• At least 6 feet from adjacent walls.
• No closer than 12 inches below
roof overhang.
• At least 7 feet above any public
walkway.
• At least 3 feet above any forced
air intake within 10 feet.
• No closer than 4 feet below or
horizontally from any door or
window or any other gravity air
inlet.
b. Do not terminate closer than 4
feet horizontally from any electric
meter, gas meter, regulator, relief
valve, or other equipment. Never
terminate above or below any of
these within 4 feet horizontally.
Item
unique to CANADA: vent system
shall terminate at least 6 ft from
electrical and gas meters.
5. Locate termination so it is not likely to
be damaged by foreign objects, such as
stones or balls, or subject to buildup of
leaves or sediment.
11 - INSTALLATION - Vent and combustion air