A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Instruction Manual page 20

Installing the New Water Heater (cont'd)
Venting (cont'd)
CUTTING OPENING THROUGH AN OUTSIDE WALL
AND COLLAR INSTALLATION
After reading the manual and you have determined the
location of the opening in the wall, (using the drawing
" hole for 2" vent piping, 3
below), cut a 2 1 ⁄
2
" hole for 4" vent piping hole through an
vent piping or a 4 ⁄
1
2
exterior wall.
NOTE: When determining location of the opening in the
outside wall allow for the
taken place in the horizontal run.
C L OF FLUE
14" MIN. 40,000 BTU/HR
12" MIN. ALL OTHER MODELS
40 GAL.– 60"
"
50 GAL.– 59 ⁄
1
2
75 GAL.– 63"
The 3" (or optional 2" and 4") PVC, ABS or CPVC Schedule
40 vent pipe can be run from the water heater through the wall
or from the wall to the water heater, whichever is most con-
venient. The vent pipe must extend a minimum of 1
the exterior wall. Extending the vent cap as far as possible from
the surface of the exterior wall will help minimize discol-
oration of the wall in this area which may be caused by the
flue gases. Note that the inside collar must be slipped over
the vent piping before locating the pipe through the wall.
Before securing the inside and outside collars to the wall, use
a silicone sealer between pipe and opening to insure a water
and air tight seal.
" hole for 3"
1 ⁄
2
" rise per five feet that has
⁄
1
8
"
MIN. RISE 1 ⁄
8
PER FIVE FEET
" through
⁄
1
2
INSTALLATION SHOWING USE OF PVC, ABS OR
CPVC PIPE
SILICONE
SEALER
SCREW
SCREW
COLLAR
SILICONE SEALER
CONNECTING VENT TO BLOWER
1. If making an immediate horizontal run of vent off the
blower, a 3" PVC, ABS or CPVC Schedule 40 elbow
(supplied locally) is required. Place the elbow in the
required direction on the blower and using 3 sheet metal
screws, attach the elbow.
SEAL WITH RTV
SEALANT
2. If there is to be a vertical run of vent from the blower, the
3" PVC, ABS or CPVC pipe must be attached to the blow-
er using 3 sheet metal screws.
SEAL WITH RTV
SEALANT
3. If the optional 2" vent piping is to be used (40,000
BTU/Hr. models only), the 2" street elbow, 3" to 2" reduc-
er and 3" (minimum) section of 3" PVC, ABS or CPVC
pipe must be supplied locally. The 3" (minimum) section
of 3" PVC, ABS or CPVC pipe must be attached to the
blower using 3 sheet metal screws.
20
EXTERIOR WALL
" MIN. EXTENSION
1 ⁄
1
2
THROUGH
EXTERIOR WALL
SCREW
SCREW
COLLAR
SCREEN
VENT CAP MUST
BE POSITIONED
DOWNWARD