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

Installing the New Water Heater (cont’d)

4.If the optional 4″ vent piping is to be used (50,000 BTU/Hr. and higher models only), the 4″ street elbow, 4″ to 3″ reducer and 3″ (minimum) section of 3″ PVC, ABS or CPVC pipe must be supplied locally. The 3″ (mini- mum) section of 3″ PVC, ABS or CPVC pipe must be attached to the blower using 3 sheet metal screws.

VENTING THROUGH A ROOF

ALL MODELS

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.

2.3″ PVC, ABS, or CPVC Schedule 40 piping and fittings are acceptable materials for the vent system on all mod- els and must be supplied locally.

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 — OPTIONAL 4″ VENT PIPING

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

1.A wire screen to fit a 4″ PVC, ABS or CPVC Schedule 40-45° vent cap is supplied with the water heater.

2.A 3″ PVC, ABS or CPVC Schedule 40 pipe, minimum length of 3″ (must be supplied locally), to make vent connection at the blower outlet.

3.A 4″ to 3″ PVC, ABS or CPVC Schedule 40 reducer (must be supplied locally).

4.4″ and 3″ PVC, ABS, or CPVC Schedule 40 piping and fittings are acceptable materials for the vent system on all 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 and must be supplied locally.

4″ PVC, ABS OR CPVC SCHEDULE 40 PIPE

4″ TO 3″ PVC, ABS OR CPVC REDUCER

3″ PVC, ABS OR CPVC SCHEDULE 40 PIPE (MINIMUM LENGTH 3″)

ALL 40 AND 50 GALLON 40,000 BTU/HR MODELS —

OPTIONAL 2″ VENT PIPING

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

1.A wire screen to fit a 2″ PVC, ABS or CPVC Schedule 40-45° vent cap is supplied with the water heater.

2.A 3″ PVC, ABS or CPVC Schedule 40 pipe, minimum length of 3″ (must be supplied locally), to make vent connection at the blower outlet.

3.A 3″ to 2″ PVC, ABS or CPVC Schedule 40 reducer (must be supplied locally).

4.2″ and 3″ PVC, ABS, or CPVC Schedule 40 piping and fittings are acceptable materials for the vent system on all 40 and 50 gallon 40,000 BTU/HR models and must be supplied locally.

2″ PVC, ABS OR CPVC SCHEDULE 40 PIPE

3″ TO 2″ PVC, ABS OR CPVC REDUCER

3″ PVC, ABS OR CPVC SCHEDULE 40 PIPE (MINIMUM LENGTH 3″)

1.The water heater requires its own (separate) venting system.

2.It cannot be connected to existing vent piping or chimney.

3.It must terminate vertically to the outdoors.

4.Typical installation(s) shown on page 22.

5.Refer to “Cementing PVC, ABS or CPVC Pipe and Fittings” on page 19 and “Connecting Vent to Blower” on pages 20 and 21.

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