40
INSTALLATION INSTRUCTIONS
Venting for Direct-Vent Water Heater (cont.)
Horizontal Vent Considerations
WARNING:
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 in severe
damage to the structure or exterior finish of the building.
–
DO NOT
locate vent terminal on the side of a
building with prevailing winter winds. This will help
prevent water lines from freezing and moisture from
freezing on walls and under eaves.
–
DO NOT
locate vent terminal too close to shrubbery,
since flue gases may damage them.
–
All painted surfaces should be primed to lessen the
chance of physical damage. Painted surfaces will
require maintenance.
–
Guard against accidental contact with people and pets.
INDOOR TANKLeSS WATeR HeATeRS
WARNING:
For multiple-unit installation,
a minimum distance between vent terminations must
be maintained to prevent recirculation of vent gases.
Maintain a horizontal center-to-center distance between
vent terminations of 19 in. (48 cm) for two-unit
installation, or 21 in. (53 cm) for installation of three or
more units.
*Vents cannot be stacked vertically.
DO NOT
terminate vent directly on brick or masonry
surfaces. A rust-resistant, sheet-metal backing plate is
recommended behind the vent.
–
Caulk all cracks, seams, and joints within
6 ft. (1.8 m) of the vent terminal.
–
Caulk around wall faceplate for weather-tight seal.
–
DO NOT
extend exposed vent pipe of indoor water
heaters outside of the building.
–
This water heater requires its own separate venting
system.
DO NOT
connect the exhaust vent to an
existing vent pipe or chimney.
OUTDOOR TANKLeSS WATeR HeATeRS
– Install outdoor water heater such that air inlet and flue
outlet are above anticipated snow level.
Rising moisture will collect under eaves.
Inside
Corner
Caulk
Caulk
Caulk
Caulk
If soffit vent is too close,
block off and install new
vent at another location.
Sheet metal plate on brick or
masonry surface recommended.
6' (1.8 m) Caulk zone or
to edge of window etc.,
starting within 6' (1.8 m)
4'
(1.2 m)
Rising moisture will collect under eaves.
Inside
Corner
Caulk
Caulk
Caulk
If soffit vent is too close,
block off and install new
vent at another location.
6' (1.8 m) Caulk zone
or to edge of window
etc., starting within
6' (1.8 m)
4'
(1.2 m)
12"
(300 mm)
Venting
minimum 19 in. (48cm)
minimum 21 in. (53cm)