Vertical Direct Venting - Lochinvar Shield SNR150-100 Installation & Service Manual

4

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.
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. Prepare the vent termination and the air termination
elbow (FIG. 4-1A) by inserting bird screens. Bird screens
should be obtained locally.
3. 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.
4. 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.
5. The vent piping must terminate in an up-turned coupling
as shown in FIG. 4-1A. The top of the coupling must
be at least 1 foot above the air intake. When the vent
termination uses a rain cap as illustrated in FIG. 4-1B
maintain at least 36" (914 mm) above the air inlet. 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 (.6 m) apart and with the vent termination at least
1 foot for PVC and 3 feet for stainless steel, above the air
intake.
6. Maintain the required dimensions of the finished
termination piping as shown in FIG. 4-1A.
7. Do not extend exposed vent pipe outside of building
more than shown in this document. Condensate could
freeze and block vent pipe.
30
Installation & Service Manual
TM
Rooftop vent and air inlet terminations
WARNING
must terminate in the same pressure zone,
unless vertical vent sidewall air is set up as
shown in the General Venting - Vertical
Vent, Sidewall Air Section.
Figure 4-1A Vertical Termination of Air and Vent
Figure 4-1B Stainless Steel Vertical Termination of Air
and Vent
ALTERNATE INTAKE LOCATIONS:
INTAKE PIPES MAY BE LOCATED
ANYWHERE WITHIN 24" (610 MM)
OF VENT PIPE
VENT
COM,BUSTION
VENT OUTLET
36" (914 MM) MINIMUM
ABOVE AIR INLET
8. 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.
BIRD SCREEN
(TYPICAL)
6" (152 MM) MINIMUM
ABOVE ROOF /
SNOW LINE
AIR