VA N TA G E
®
H E
I N S TA L L AT I O N M A N U A L
R O B E R T S
-
G O R D O N
pg 28
Figure 26. Non-Pressurized Outside Air Supply for Single Heater Installations
OUTSIDE COMBUSTION AIR SUPPLY
IMPORTANT: If the building has a slight negative
pressure or contaminants such as halogenated
hydrocarbons are present in the air, an outside
combustion air supply to the heaters is strongly
recommended.
The VANTAGE
®
H E heater is approved for installation
with an outside air supply system. An outside air supply
should not be used with the draft hood venting
configuration.
For an outside air supply, a 4" (10 cm) O.D. single wall
pipe may be attached to the heater. The duct may be up
to 45 ft. (13.7 m) maximum length or 2 ft. (60 cm)
minimum length with no more than 2 elbows. See Vent
Length Requirements heading on pg. 22 for more detailed
guidelines.
Band Clamp
Burner Assembly
Vent Cap
Wall
HORIZONTAL INSTALLATION
Flex Pipe
6" to 12" (15 cm to 30 cm) Long
Vent Cap
4" (10 cm) Single Wall
Pipe Seal All Joints
VERTICAL INSTALLATION
Band Clamp
Burner Assembly
Flex Pipe
6" to 12" (15 cm to 30 cm) Long
The air supply duct may have to be insulated to prevent
condensation on the outer surface. The outside air
terminal should be securely fastened to the outside wall
by drilling four 1/4" (6 mm) diameter holes in the outside
flange; wood screws or bolts and expansion sleeves may
be used to fasten the terminal.
For the outside air ter minal, use the Vent Cap
(P/N 90502300) that is provided with the
VANTAGE
®
H E heater.
PVC pipe, aluminum flex duct, or equivalent may be used
instead of single wall pipe for the outside combustion air
supply.