A.O. Smith COF-199 THRU 700A Specifications download pdf (Page 6)

• When communicating with outdoors by means of vertical ducts,

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

inch per 4,000 Btu per hour (551 mm

/kW) (35 square inches

per gallon of oil consumed per hour) of total input rating 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 2,000 Btu per hour

(1,101 mm

/kW) (70 square inches per gallon of oil

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

enclosure, fig. 6.

FIGURE 6

FLUE GAS VENTING

In the absence of any local codes, regulations, or vent pipe or chimney

manufacturer's recommendations, for oil fired equipment, follow the

suggestions below for designing and installing a venting system.

For these water heaters, it is recommended that an adequate

chimney be used for venting the flue gases. Type B, double wall,

vent pipe should be used as the vent connector pipe. However,

where no chimney is available, vent pipe may be used to construct

a vent.

Where an existing chimney or vent is to be used, be sure that the

chimney or vent has adequate capacity for the number and

sizes of appliances being vented through it. Inspect the chimney

or vent and remove all soot or other obstructions which will retard

free draft.

VENT CONNECTOR AND DRAFT REGULATOR

The chimney or vent connector diameter should be the same size as the

heater flue outlet, see Table 4. A minimum rise of 1/4" per foot

(21 mm/M) of horizontal connector length must be maintained between

the heater and chimney opening, fig. 7. The connector length should be

kept as short as possible.

TABLE 4 SUGGESTED VENT CONNECTOR SIZES

Outlet Diameter

Model Number Inches (mm)

COF-199* 6 152.4

COF-245 8 203.2

COF-315/315A 8 203.2

COF-385/385A 8 203.2

COF-455/455A 8 203.2

COF-700/700A 10 254

* These models are factory supplied with a flue reducer which

should be installed on the top cover.

In venting systems where a continuous or intermittent back

(positive) draft is found to exist, the cause must be determined

and corrected. In some cases, a special vent cap may be

required.

If the back draft cannot be corrected by normal methods or if a

suitable draft cannot be obtained, additional make up air must be

provided to the room to assure proper venting and combustion.

Note: A negative draft must be maintained in the vent piping.

The barometric draft regulator must be installed in the same room as

the heater, fig. 6. Locate the regulator as close as possible to the

heater and at least 18" (452 mm) from a combustible ceiling or wall.

A manually operated damper should not be placed in the chimney

connector.

PROPER VENT CONNECTOR INSTALLATION

FIGURE 7

CHIMNEY

The oil-fired water heater must be connected to a chimney built in

accordance with accepted building code practice or listed factory

built type, Table 5. The exit point of the chimney flue gas must be at

least 3' (0.91M) above the highest point where it passes through

the roof of a building. Also, it must be at least 2' (0.61M) higher than

any portion of a building within 10' (3.05 M) of the chimney.

TABLE 5 - USUAL CHIMNEY SIZES FOR UNITS

Oil Equivalent Output Square & Rectangle

Firing Heat Input Heat Stack Round Stack Minimum

Model Rate Rate Rate Dimension Diameter Height

Number (GPH) (LPH) Btuh kW Btuh kW Inches mm Inches mm Feet Metres

COF-199 1.42 5.38 199,000 58 159,200 47 8 1/2 X 8 1/2 216 x 216 9 228.6 20 6.1

COF-245 1.75 6.62 245,000 72 196,000 57 8 1/2 X 8 1/2 216 x 216 9 228.6 20 6.1

COF-315/315A 2.25 8.52 315,000 92 252,000 74 8 1/2 X 13 216 x 330 10 254 30 9.1

COF-385/385A 2.75 10.41 385,000 113 308,000 90 8 1/2 X 13 216 x 330 10 254 30 9.1

COF-455/455A 3.25 12.30 455,000 133 364,000 107 13 X 13 330 x 330 12 304.8 35 10.7

COF-700/700A 5.0 18.93 700,000 205 560,000 164 13 X 18 330 x 457 14 355.6 40 12.2

1 2 3 4 5 6 7 8 9 10 11 ... 55 56

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A.O. Smith COF-199 THRU 700A Specifications Page 6

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