A.O. Smith COF-199 THRU 700A Specifications download pdf (Page 5)

• The discharge opening of the relief valve should always be piped

to an open drain.

• Choose the point of major hot water usage, fuel supply and chimney.

• Try to make hot water and oil piping as short as possible.

• Insulate hot and cold water piping where heat loss and

condensation may be a problem.

CLEARANCES

The heater has minimum clearances to combustible material, on a non-

combustible floor of: 6 inches (152 mm) from the sides and rear, 24

inches (610 mm) from the front, and 18 inches (457 mm) from the vent

connector. These clearances are, as shown in fig. 4A to prevent possible

fire hazard conditions.

At least 24" (610 mm) of top clearances are recommended for vertical

vent installation.

Allow sufficient room at rear of heater for servicing of T&P relief valve.

At least 24" (610 mm) should be provided at the front of the unit for

proper servicing.

Units which are to be installed on combustible flooring must be supported

by a full layer of hollow concrete blocks, fig. 4, from 8" (203 mm) to

12" (305 mm) thick and extending 12" (305 mm) minimum beyond the heater in

all directions. The concrete blocks must provide an unbroken concrete surface

under the heater, with the hollows running continuous and horizontally. A 3/

16" (4.8 mm) steel plate must cover the concrete blocks, see fig. 3.

PROPER INSTALLATION ON COMBUSTIBLE FLOORING

FIGURE 4

NOTE: If electrical conduits run under the floor of the proposed heater

location, insulate the floor as recommended above.

PROPER INSTALLATION CLEARANCES FOR TWO DIFFERENT

VENTING SYSTEMS

FIGURE 4A

* HOT WATER OUTLET LOCATION AT FRONT OF HEATER

• FACTORY FURNISHED HEATER MANIFOLD KITS (OPTIONAL) ARE

DESIGNED FOR 10" (254 mm) SPACING BETWEEN SIDES OF

ADJACENT UNITS.

COMBUSTION AND VENTILATION AIR

GENERAL

The water heater area should have sufficient air for satisfactory

combustion of oil, and proper venting and of safe ambient temperature.

When a heater is installed in an area where exhaust or ventilating fans

may create unsatisfactory combustion or venting, approved provisions must

be made to overcome the problem, see NFPA Standard No. 31, Chapter 1.

CHEMICAL VAPOR CORROSION

Water heater corrosion and component failure can be caused by the

heating and breakdown of air borne chemical vapors. Spray can

propellants, cleaning solvents, refrigerator and air conditioning

refrigerants, swimming pool chemicals, calcium and sodium chlorides,

waxes, and process chemicals are typical compounds which are

potentially corrosive. These materials are corrosive at very low

concentration levels with little or no odor to reveal their presence.

Products of this sort should not be stored near the heater. Also, air

which is brought in contact with the water heater should not contain any

of these chemicals. If necessary, uncontaminated air should be obtained

from remote or outside sources.

UNCONFINED SPACES (Building Construction)

NOTE: An uncontaminated space is defined as a space whose volume

is not less than 50 ft

per 1000 BTUH (4.83m

per kW)of total input

of all fuel burning appliances installed in that space. The unconfined

space may be thought of as extending to all areas which cannot

be separated by a door or door(s). All other spaces not fitting

this description, should be thought of as confined space.

1. In unconfined spaces in buildings of conventional frame, brick or

stone construction, infiltration will normally supply an adequate

amount of air for combustion and ventilation.

2. If the unconfined space is within a building of tight construction, eg.

weather stripping, heavy insulation, caulking, vapor barrier, ect., air

infiltration may be insufficient to support proper combustion and

ventilation, air shall be obtained from outdoors or from spaces freely

communicating with the outdoors.

• Follow the instructions under Part 2 of Confined Spaces (Room

Construction)

CONFINED SPACES (Room Construction)

1. All air from inside building (conventionally constructed buildings only):

The confined space shall be provided with two permanent openings,

one within 12" (305 mm) of the ceiling and one within 12" (305 mm) of

the floor, fig. 5.

FIGURE 5

• Each opening shall have a free area of not less than one square

inch per 1,000 Btu per hour (140 square inches per gallon of oil

consumed per hour) of the total input rating of all appliances in the

enclosure, freely communicating with the interior areas having in

turn adequate infiltration from the outside. In all cases, each

opening shall not have a free area of less than 100 square inches.

2. All Air From Outdoors: The confined space shall be provided with

two permanent openings, one in or within 12" of the top of the

enclosure and one in or within 12" of the bottom. The openings shall

communicate directly, or by means of ducts, with outdoors or such

spaces that freely communicate with outdoors.

• If the appliance room is located against an outside wall and the air

openings communicate directly with the outdoors, each opening

shall have a free area of not less than one square inch per 4,000

Btu per hour (35 square inches per gallon of oil consumed per

hour) of the total input rating of all appliances in the enclosure.

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A.O. Smith COF-199 THRU 700A Specifications Page 5

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