Rheem Maximus Manual page 18

INSTALLATION
TYPICAL HORIZONTAL VENT INSTALLATION
Vent Pipe
Pipe &
Coupling
To the Water Heater
Additional Considerations (in the following pages)
DO NOT install vent terminals under any patio or deck.
To help prevent moisture from freezing on walls and under
eaves, DO NOT locate outlet vent terminal on the side of your
home with prevailing winter winds.
DO NOT terminate vent pipe directly on brick or masonry
surfaces. Use a rust-resistant sheet metal backing plate behind
vent. (See Figure above.)
DO NOT locate vent terminal too close to shrubbery, since flue
gases may damage them.
Caulk all cracks, seams and joints within 6 feet
(1.83 m) of vent terminal.
All painted surfaces should be primed to lessen the chance of
physical damage. Painted surfaces will require maintenance.
Make sure that all vent pipes exposed to cold conditions
(attics, crawl spaces, etc.) have the proper slope and support
to keep moisture from accumulating in the vent pipes. NOTE:
Insulating of non-metallic vent materials is prohibited.
This water heater requires its own separate venting system.
DO NOT connect the exhaust vent to an existing vent pipe or
chimney.
Moisture in the flue gas will condense as it leaves the vent
terminal. In cold weather this condensate can freeze on the
exterior wall, under the eaves, and on surrounding objects.
Some discoloration to the exterior of the building is to be
expected; however, improper location or installation can result
18
Min. 24"
Inlet Outlet
Sheet Metal Shield on
Brick or Masonry Walls
Elbow can be a maximum
of 1 inch from the wall.
Inlet Vent Terminal
Vent
with 1/2" Mesh
Pipe
Protective
Screen Inside
Outside of the
Building Wall
in severe damage to the structure or exterior finish of the
building. In locations with extended amounts of time with
temperatures under 40°F. (4°C.) and/or prevailing wind toward
the outlet vent, make sure that the outlet vent terminal is at
least 2 feet (0.61 m) away from anything that can be damaged
by the condensate.
HORIZONTAL VENT
INSTALLATION
Once the vent terminal location has been determined, make a
hole through the exterior wall to accommodate the vent pipe.
The vent pipe must exit the exterior wall horizontally only (See
Typical Horizontal Vent Installation Figure on this page).
Insert a small length of vent pipe through the wall, and
connect the coupling as shown in Typical Horizontal Vent
Installation Figure. Connect the vent terminal as shown to the
vent pipe on the exterior of the building. Seal any opening
around the vent pipe or fittings with mortar or silicone caulk
as shown in Typical Horizontal Vent Installation Figure.
Complete the rest of the vent pipe installation to the water
heater's vent connector fitting on the blower outlet. If
necessary, support the horizontal run of pipe as previously
mentioned.
VERTICAL VENT TERMINAL LOCATION
*Min. 12"(30.5 cm)
Above Roof or
Min. 12"(30.5 cm) Above
Anticipated Snow Level.
Max. 24"(61 cm) Above
Roof (Without Additional
Support)
VERTICAL VENT
INSTALLATION
Once the vent terminal location has been determined, make
a hole through the roof and interior ceiling to accommodate
the vent pipe. Complete the vent pipe installation to the water
heater's vent connector fitting on the blower outlet. Support
vertical or horizontal runs as previously mentioned.
Install adequate flashing where the vent pipe passes through
the roof. Determine the vent terminal height and cut the vent
pipe accordingly. Refer to Vertical Vent Terminal Location
Figure for the proper vent terminal height. Connect the vent
elbow onto the vertical pipe through the roof. Connect a short
piece of vent pipe (approximately 3" (7.6 cm) long) to the
elbow, and, then, join the vent terminal to the short piece of
vent pipe.
Short Piece of Vent
Pipe
Vent Pipe
Through
Roof
Elbows
* Min of 18"(46 cm) for Canada