Lochinvar Knight 80 - 285 - Manual (Page 24)

Installation & Operation Manual
24
5
Vertical direct venting
Vent/air termination – vertical
Follow instructions below when
determining vent location to avoid
possibility of severe personal injury, death
or substantial property damage.
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.
Determine location
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 the General Venting Section on page
15 of this manual.
2. The vent must terminate at least 3 feet above the highest
place in which the vent penetrates the roof and at least 2
feet above any part of a building within 10 horizontal
feet.
3. The air piping must terminate in a down-turned 180°
return pipe no further than 2 feet from the center of the
vent pipe. This placement avoids recirculation of flue
products into the combustion air stream.
4. The vent piping must terminate in an up-turned coupling
as shown in FIG. 5-1. The top of the coupling must be at
least 1 foot above the air intake. The air inlet pipe and
vent pipe can be located in any desired position on the
roof, but must always be no further than 2 feet apart and
with the vent termination at least 1 foot above the air
intake.
Figure 5-1 Vertical Termination of Air and Vent
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.
ƽ WARNING
NOTICE
ƽ WARNING
Do not connect any other appliance to the
vent pipe or multiple boilers to a common
vent pipe. Failure to comply could result in
severe personal injury, death, or substantial
property damage.
ƽ WARNING Rooftop vent and air inlet terminations
must terminate in the same pressure
zone.