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Installation instructions
Although it is permissible to draw combustion air from the inside, it is not
the manufacturer's recommended installation method. Always install a 3
inch 90° elbow on the top of the combustion air inlet adaptor to prevent
foreign objects from falling into the unit.
If a single pipe installation is utilized, follow guidelines below for
providing adequate combustion air for the water heater as well as any
other appliances that may consume air in the same space. Always follow
local codes if they are more stringent and regulations.
• Appliances located in unconfined spaces:
– a) An unconfined space is one whose volume is greater than 50
cubic feet (1.42 cubic meter) per 1000 BTU/hr (292.81 Watts)
of the combined rating of all appliances installed in the space.
That would be 9950 cubic feet (281.8 cubic meters) for the
water heater alone.
– b) In unconfined spaces in buildings of conventional frame,
masonry, or metal construction, infiltration air is normally
adequate to provide air for combustion.
• Appliances located in confined spaces:
The confined space must be provided with two permanent openings,
one commencing within 12 inches (304.8mm) of the top and one
commencing within 12 inches (304.8mm) of the bottom of the
enclosure. Each opening must have a minimum free area of one
square inch per:
– 1000 BTU/hr (292.81 Watts) if all air is taken from inside the
building
– 2000 BTU/hr (585.62 Watts) if all air is taken from the outside by
horizontal ducts
– 4000 BTU/hr (1171.24 Watts)if all air is taken from the outside
by direct openings or vertical ducts
Or the confined space must be provided with one permanent opening or
duct that is within 12 inches (304.8mm) of the ceiling of the enclosure.
This opening must have a minimum free area of one square inch per:
– 3000 BTU/hr (878.43 Watts) if all air is taken from the outside by
a direct opening or vertical duct.
Louvers, grills and screens have a blocking effect, when used, increase
the sizes of your openings by 300% for wood louvers (as wood type will
reduce the free air by 75%) and 43% for metal louvers (as metal will
reduce the free air by 30%). Refer to the National Fuel Gas Code for
complete information. In buildings of tight construction all air should be
taken from outside.
4.5
Proper location for installing your heater
Carefully select the location of the water heater. For your safety and for
proper heater operation, you must provide combustion air to the heater
and a proper exhaust vent system.
Follow the guidelines below:
▶ 1. Locate the heater where venting, gas and plumbing connections
are feasible and convenient.
▶ 2. The hot water lines should be kept short and insulated to save
energy. Centrally locating the water heater is recommended to keep
hot water distribution times even throughout the structure.
NOTICE: Risk of appliance freezing!
▶ The water in this water heater is cold and always
remains cold except for the times the burner is on. In
the event of power outage in conjunction with
freezing temperatures, it is recommended that the
heater be drained.
See chapter 7.2, page 38 "Winterizing" for draining
instructions.
24
WARNING:
▶ Flammable materials, gasoline, pressurized
containers, or any other items or articles that are
potential fire hazards must NOT be placed on or
adjacent to the heater. The appliance area must be
kept free of all combustible materials, gasoline and
other flammable vapors and liquids.
4.6
Heater placement and clearances
The water heater design is approved for installation on a combustible
wall (see chapter 4.7 Mounting installation) provided the floor covering
below the heater is noncombustible.
For installations in an alcove or closet, maintain the minimum clearances
to combustible and non-combustible materials. See fig. 6, page 9.
4.7
Hanging appliance on the wall
WARNING: Severe personal injury and property
damage!
Before mounting appliance:
▶ Check that there are no loose or damaged parts
inside the appliance.
▶ Confirm that the gas type of the heater matches the
gas supply you will be connecting the heater, see
Fig.2, page 7.
Front cover should be removed (see instructions on page
8) in order to inspect components visually.
WARNING:
▶ Do not install this appliance on a carpeted wall. The
heater must be mounted on a wall using appropriate
anchoring materials.
NOTICE: Risk of appliance freezing!
▶ In areas where outside temperature is routinely
below 32°F (0 °C) and the heater is to be installed on
the inside of an exterior wall, a minimum 2" air gap or
rigid insulation between the heater back and the wall
is recommended.
If wall is sheathed with plaster or drywall, it is recommended that two
support boards, either 1"x 4" or 1/2" (minimum) plywood first be
attached across a pair of studs, see fig. 30, page 25.
▶ Secure the wall mounting bracket provided with the heater to a wall
surface. The heater must be kept level on the wall surface, see fig.
31, page 25.
▶ Hang the appliance on the bracket, see fig. 32, page 26.
RTG 199 HE – 6 720 811 617 (2016/01)
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