Common Venting - Rheem RTGH-C95DVLN Installation Instructions Manual

INSTALLATION INSTRUCTIONS
Installation for Power Vent (Room Air Application)
DO NOT store or use gasoline or other
flammable vapors and liquids in the vicinity of
this or any other appliance. To do so may result
in an explosion or fire.
This water heater can use room air for
combustion and ventilation as long as the
installation complies with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, and other
applicable standards and local codes. Failure
to comply with these standards and other
instructions on the Common Vent Installation
Instructions and the Tankless Water Heater Use
and Care Manual may result in death or serious
injury and/or damage to property.
Combustion Air Requirements
Rheem commercial tankless water heater is allowed to
utilize room air in commercial applications using Rheem
common venting system.
Proper operation of the water heater requires air for
combustion and ventilation. Provisions for combustion
and ventilation air must comply with referenced codes
and standards.
Air for Combustion and Ventilation
Air for combustion, ventilation, and dilution of flue gases
for water heater installed in buildings shall be obtained
by indoor combustion air, outdoor combustion air, or
combination indoor and outdoor.
Indoor Combustion Air
The minimum required volume shall be no less than 50
cubic feet per 1000 Btu/hr (4.8 cubic meters per kW) of
the aggregate input rating of all appliances within the
space.
Openings used to connect indoor spaces shall be sized
and located in accordance with the following:
(1) Combining spaces on the same story. Each opening
shall have a minimum free area of 1 square inch per
1000 Btu/hr (2200 square millimeters per kW) of the
aggregate input rating of all appliances in the space
but not less than 100 square inches (0.06 square
meters). One opening shall commence within 12"
(30 cm) of the top of the enclosure and one opening
shall commence within 12" (30 cm) of the bottom
of the enclosure. The minimum dimension of air
openings shall not be less than 3" (8 cm).
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FOR YOUR SAFETY
(2) Combining spaces in different stories. The volumes
of spaces in different stories shall be considered
as communicating spaces where such spaces are
connected by one or more openings in doors or
floors having a total minimum free area of 2 square
inches per 1000 Btu/hr (4400 square millimeters per
kW) of the aggregate input rating of all appliances.
Outdoor Combustion Air
Outdoor combustion air shall be provided through
opening(s) to the outdoors in accordance with two
permanent opening method or one permanent opening
method. The minimum dimension of air openings shall
not be less than 3" (8 cm).
Two Permanent Openings Method
Two permanent openings, one commencing within
12" (30 cm) of the top of the enclosure and one
commencing within 12" (30 cm) of the bottom of
the enclosure, shall be provided. The openings shall
communicate directly, or by ducts, with the outdoors or
spaces that freely communicate with the outdoors, as
follows:
(1) Where directly communicating with the outdoors
or where communicating to the outdoors through
vertical ducts, each opening shall have a minimum
free area of 1 square inches per 4000 Btu/hr (550
square millimeters per kW) of aggregate input rating
of all appliances in the enclosure.
(2) Where communicating with the outdoors through
horizontal ducts, each opening shall have a minimum
free area of 1 square inches per 2000 Btu/hr (1100
square millimeters per kW) of aggregate input rating
of all appliances in the enclosure.
One Permanent Opening Method
One permanent opening, commencing within 12" (30
cm) of the top of the enclosure, shall be provided. The
water heaters shall have clearances of at least 1" (2.5
cm) from the sides and back and 6" (15 cm) from the
front of the water heaters. The opening shall directly
communicate with the outdoors or shall communicate
through a vertical or horizontal duct to the outdoors or
spaces that freely communicate with the outdoors and
shall have a minimum free area of the following:
(1) 1 square inches per 3000 Btu/hr (700 square
millimeters per kW) of the aggregate input rating of
all appliances located in the enclosure
(2) Not less than the sum of the areas of all vent
connectors in the space