A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Venting

Installing the New Water Heater (cont’d)

Venting

WARNING

To insure proper venting of this gas-fired water heater, the correct vent pipe diameter must be utilized. Do not install any other gas appliances on the same vent with this water heater as this will adversely affect the operation of the water heater.

The combustion and ventilation air flow must not be obstructed.

WARNING

The water heater outlet must be connected to a vent which terminates to the outdoors. Never operate the water heater unless it is vented to the outdoors and has adequate air supply to avoid risks of improper opera- tion, explosion or asphyxiation.

WARNING

Obstructed or deteriorated vent systems may present serious health risk or asphyxiation.

WARNING

The vent pipe from the water heater must slope upward 1⁄8 inch per five linear feet for any horizontal run.

All vent gases must be completely vented to the outdoors of the structure (dwelling).

Min. rise 1⁄8″ per five feet

WARNING

Failure to have required clearances between water heater and combustible material will result in a fire hazard.

WARNING

Be sure vent pipe is properly connected to prevent escape of dangerous flue gases which could cause deadly asphyxiation.

WARNING

Chemical vapor corrosion of the flue and vent system may occur if air for combustion contains certain chem- ical vapors. Spray can propellants, cleaning solvents, refrigerator and air conditioner refrigerants, swimming pool chemicals, calcium and sodium chloride, waxes, bleach and process chemicals are typical compounds which are potentially corrosive.

31⁄2'

STRAPPING

Horizontal runs must be securely supported at 31⁄2 foot intervals and vertical runs supported at 5 foot intervals.

VENTING THROUGH AN OUTSIDE WALL

75 GALLON 70,000 and 75,000 BTU/HR, 50 GALLON 52,500, 55,000 and 62,500 BTU/HR, 40 GALLON 50,000 BTU/HR MODELS ONLY

(See rating plate for BTU/HR rating)

3″ PVC, ABS or CPVC Schedule 40 vent piping:

1.A 3″ PVC Schedule 40-45° vent cap with wire screen is supplied with the water heater.

2.A 3″ PVC, ABS or CPVC Schedule 40-90° street ell; used to connect the vent pipe to the water heater when the vent pipe is to be turned horizontally directly off the blower (supplied locally).

3.3″ PVC, ABS or CPVC Schedule 40 pipe (must be sup- plied locally).

3″ PVC, ABS OR CPVC SCHEDULE 40

90° STREET ELBOW

3″ PVC, ABS OR CPVC

SCHEDULE 40 PIPE VENT CAP WITH SCREEN

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