A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Per Five Feet

Installing the New Water Heater (cont’d)

3.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.

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

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

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

The vent piping may be installed as follows:

3 ELBOW EXAMPLE

MIN. RISE 1⁄8″

PER FIVE FEET

3 ELBOW

2″ PVC, ABS OR CPVC

2″ PVC, ABS OR CPVC SCHEDULE 40 PIPE SCHEDULE 40 90°

STREET ELBOW

3″ TO 2″ PVC, ABS OR CPVC REDUCER

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

VENT CAP

AND SCREEN

EXAMPLE

MIN. RISE 1⁄8″

PER FIVE FEET

MIN. RISE 1⁄8″

PER FIVE FEET

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

8.2″ 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.

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

10.It must terminate horizontally to the outdoors.

NOTE: See pages 21 and 22 for vertical venting through a roof.

VENTING SYSTEM EXAMPLE INSTALLATIONS FOR ALL MODELS

The vent piping cannot under any circumstances be run downhill.

3 ELBOW EXAMPLE

MIN. RISE 1⁄8″

PER FIVE FEET

MIN. RISE 1⁄8″

PER FIVE FEET

1. Horizontal runs require a minimum 1⁄8″ rise per five feet.

40 AND 50 GALLON MODELS 50,000 BTU/HR AND HIGHER, 75 GALLON MODELS (3″ VENT)

SEE CHART ON PAGE 18 FOR MAX. LENGTH

		16″ MIN.
131⁄2″ MIN.
			MIN. RISE 1⁄8″
	12″ MIN.
			PER FIVE FEET

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