Outside Combustion Air Supply - Roberts Gorden Vantage HE-40 Installation, Operation & Service Manual

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pg 28 H E
VA N TA G E
4" (10 cm) Single Wall
Pipe Seal All Joints
Vent Cap
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.
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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.
I N S TA L L AT I O N M A N U A L
Wall
Vent Cap
Band Clamp
Flex Pipe
6" to 12" (15 cm to 30 cm) Long
Band Clamp
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
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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.
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R O B E R T S
Burner Assembly
Burner Assembly
is provided with
G O R D O N
the