Vertical Direct Venting; Vertical Direct Venting Vent/Air Termination - Vertical; Determine Location - Lochinvar 150 - 500 Installation & Operation Manual

5

Vertical direct venting

Vent/air termination – vertical
Follow instructions below when determining
WARNING
vent location to avoid possibility of severe
personal injury, death or substantial
property damage.
Do not connect any other appliance to the
WARNING
vent pipe or multiple water heaters to a
common vent pipe. Failure to comply could
result in severe personal injury, death, or
substantial property damage.
Installation must comply with local
NOTICE
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 17 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.
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Installation & Operation Manual
Rooftop vent and air inlet terminations
WARNING
must terminate in the same pressure zone.
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.