Installation - A.O. Smith AOSRG45200 Owner's Manual

REQUIRED ABILITY
INSTALLATION OR SERVICE OF THIS WATER HEATER RE-
QUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED
TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR SUP-
PLY, VENTING AND GAS SUPPLY ARE REQUIRED.
GENERAL
The installation must conform to these instructions and the local
code authority having jurisdiction. In the absence of local codes,
the installation must comply with the latest editions of the National
Fuel Gas Code, ANSI Z223.1/NFPA 54. The code is available from
the Canadian Standards Association, 8501 East Pleasant Valley
Road, Cleveland, OH 44131.
LOCATION OF HEATER
The heater is design certified by the American Gas Association for
installation on combustible flooring in a closet having minimum clear-
ances from combustible material of: 0" clearance from sides and
rear, 4" from the front and 12" from the top. (Standard clearance.) If
clearances stated on the heater differ from standard clearances,
install water heater according to clearances stated on heater.
A minimum clearance of 4" must be allowed for access to replace-
able parts such as the thermostats, drain valve and relief valve.
Adequate clearance for servicing this appliance should be consid-
ered before installation, such as changing the anodes, etc. Mini-
mum clearances for proper operation are given above.
When installing the heater, consideration must be given to proper
location. Location selected should be as close to the stack or chim-
ney as practicable with adequate air supply and as centralized with
the water piping system as possible.
For California installation this water heater must be braced,
anchored, or strapped to avoid falling or moving during an
earthquake. See instructions for correct installation procedures.
Instructions may be obtained from your local dealer, wholesaler,
public utilities or California's Office of the State Architect, 400 P
Street, Sacramento, CA 95814.
AIR REQUIREMENTS
In calculating the free area of a vent opening, the blocking effect of
screens, louvers and grills should be considered. Screens shall not
be of a mesh smaller than 1/4 inch square. If the free area is not
known, the latest edition of National Fuel Gas Code ANSI Z223.1
recommends using figures of 20-25 percent free area for wood lou-
vers or 60-75 percent for metal grills or louvers.
UNCONFINED SPACE
In buildings of conventional frame, brick or stone construction, un-
confined spaces may provide adequate air for combustion, ventila-
tion, and draft hood dilution.

INSTALLATION

WARNING
If the unconfined space is within a building of tight construction
(building using the following construction: weather stripping, heavy
insulation, caulking, vapor barrier, etc.), air for combustion, venti-
lation, and draft hood dilution must be obtained from outdoors. The
installation instructions for confined spaces must be followed.
Installation:
Do not install water heater
where flammable products will
be stored or used unless the
main burner and pilot flames are
CONFINED SPACE
When drawing combustion and dilution air from inside a conven-
tionally constructed building to a confined space, such a space shall
be provided with two permanent openings. ONE IN OR WITHIN 12
INCHES OF THE ENCLOSURE TOP AND ONE IN OR WITHIN 12
INCHES OF THE ENCLOSURE BOTTOM. Each opening shall have
a free area of at least one square inch per 1000 Btuh of the total
input of all appliances in the enclosure, but not less than 100 square
inches.
If the confined space is within a building of tight construction, air for
combustion, ventilation and draft hood dilution must be obtained
from outdoors. When directly communicating with the outdoors or
communicating through vertical ducts, two permanent openings,
located in the above manner, shall be provided. Each opening shall
have a free area of not less than one square inch per 4000 Btuh of
the total input of all appliances in the enclosure. If horizontal ducts
are used, each opening shall have a free area of not less than one
square inch per 2000 Btuh of the total input of all appliances in the
enclosure.
In cold climates provide protection against freeze-up. THE HEATER
SHOULD BE LOCATED IN AN AREA WHERE LEAKAGE OF THE
TANK OR CONNECTIONS WILL NOT RESULT IN DAMAGE TO
THE AREA ADJACENT TO THE HEATER OR TO LOWER FLOORS
OF THE STRUCTURE. When such locations cannot be avoided,
4
at least 18" above the floor. This
will reduce, but not eliminate, the
risk of vapors being ignited by
the main burner or pilot flame.
CAUTION