Vertical Direct Venting; Vertical Direct Venting Vent/Air Termination - Vertical; Determine Location - Lochinvar FTXL 400 Installation & Operation Manual

5

Vertical direct venting

Vent/air termination – vertical
Follow
WARNING
determining 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. Th e total length of piping for vent or air must not exceed
the limits given in the General Venting Section on page
18 of this manual.
2. Prepare the vent termination and the air termination
elbow (FIG. 5-1A) by inserting bird screens. Bird screens
should be obtained locally.
3. Th e 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. Th e air piping must terminate in a down-turned 180°
return pipe no further than 2 feet (.6 m) from the center
of the vent pipe. Th is placement avoids recirculation of
fl ue products into the combustion air stream.
5. Th e vent piping must terminate in an up-turned coupling
as shown in FIG. 5-1A. Th e 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. 5-1B
maintain at least 36" (914 mm) above the air inlet. Th e
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 above the air intake.
6. Maintain the required dimensions of the fi nished
termination piping as shown in FIG. 5-1A.
7. Do not extend exposed vent pipe outside of building
more than shown in this document. Condensate could
freeze and block vent pipe.
WARNING Rooft op vent and air inlet terminations
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.
instructions below when
Installation & Operation Manual
Figure 5-1A PVC/CPVC/Polypropylene
Termination of Air and Vent
ALTERNATE INTAKE LOCATIONS:
INTAKE PIPES MAY BE LOCATED
ANYWHERE WITHIN 24" (610 MM)
OF VENT PIPE
BIRD SCREEN
(TYPICAL)
COUPLING
(FIELD SUPPLIED)
VENT OUTLET
12" MINIMUM
ABOVE AIR INLET
Figure 5-1B 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
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.
VENT
6" (152 MM) MINIMUM
ABOVE ROOF /
SNOW LINE
COMBUSTION
AIR
BIRD SCREEN
(TYPICAL)
6" (152 MM) MINIMUM
ABOVE ROOF /
SNOW LINE
COM,BUSTION
AIR
Vertical
31