A.O. Smith 100 Series Installation And Operating Manual page 17

2. Follow the vent manufacturer's instructions for installing the
venting.
3. Install the properly sized debris screen into the outlet elbow and
secure with a small quantity of silicone sealant.
4. Do not seal the vent piping to the wall until the venting is properly
connected to the condensate trap assembly.
5. Complete the venting installation by sealing around the
termination assembly where it passes through the outside wall,
inside and out, with silicone or other suitable sealant. Apply
enough sealant to secure the (optional) cover plate to the wall.
CAUTION
Use of Solvent Cement and Primer
• Use only in well-ventilated areas.
• Do not use near flame or open fire.
• Use only the Solvent Cement and Primer appropriate for
the venting material being used.
• Solvent cements for plastic pipe are flammable liquids and
must be kept away from all sources of ignition.
VENT SCREENS
Installed in the intake and vent termination elbows, the debris vent
screen is required to keep foreign objects, rodents and small birds
from entering the venting system. Any such debris can activate the
Blocked Air sensors and prevent the water heater from operating.
• Install the debris vent screen in both the air intake pipe and the
exhaust pipe.
• Gently push the screen into the termination elbow until it sits
against the inside shoulder.
• The debris vent screens are self-securing.
Note: In the concentric vent application, the vent screen is to be
installed in the exhaust piping only.
2" Vent piping (2.45" (6.22 cm) O.D.)
4" Vent piping (4.50" (11.43 cm) O.D)
Figure 13. Termination Debris Screens
Breathing Hazard - Carbon Monoxide Gas
Failure to install the appropriate screen could
result in improper heater operation with
attendant risk of property damage, personal
injury or death by fire or carbon monoxide
poisoning.
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
IMPORTANT NOTES AND WARNINGS
• Do not allow insulation to cover the vent piping.
• During operation the plastic piping will expand as it heats up and
contract as it cools down. This is normal for this type of venting.
Rigidly fastening the vent piping can cause undue stress that
may result in the cracking or fracturing the vent piping material.
A fracture of the venting pipe may pose a serious safety hazard.
To prevent stressing of the vent system, all hangers and
supports must allow the vent piping freedom to move.
• All power vented water heaters generate a certain amount of
operational noise. In order to minimize noise transmission to the
support structure, use isolation pads between the pipe hangers
and the vent pipe.
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3" Vent piping (3.56" (9.04 cm) O.D.)
WARNING