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

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
inch per five linear feet for any horizontal run.
All vent gases must be completely vented to the outdoors of
the structure (dwelling).
WARNING
Failure to have required clearances between water heater
and combustible material will result in a fire hazard.
⁄
1
8
"
Min. rise ⁄
1
8
per five feet
3" PVC, ABS OR CPVC
SCHEDULE 40
90° STREET ELBOW
15
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.
Horizontal runs must be securely supported at 3
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 PIPE
3 ⁄ '
1
2
STRAPPING
VENT CAP
WITH SCREEN
⁄ foot
1
2