Venting Instructions - A.O. Smith GAS WATER HEATER User Manual

Venting Instructions

Warning:
• Improper venting of this appliance can result in excessive levels of carbon
monoxide which can result in severe personal injury or loss of life.
• Improper installation can cause nausea or asphyxiation, severe injury or death
from carbon monoxide and flue gases poisoning. Improper installation will
void product warranty.
Caution: While installing the vent system, all applicable national and local codes
must be followed.
General rules for venting water heaters are:
• Use standard vent tubes provided by A. O. Smith.
• It is prohibited to attach any non-standard tubes to the
vent or extend the length. Contact A. O. Smith Customer
Care for maximum permissible length and no. of elbows.
• For specific venting requirement contact A. O. Smith
Customer Care.
• Maintain air tight sealing at the vent pipe joints.
• Place the water heater as close as possible to the vent
terminator.
• The vent collar of the water heater must be fastened
directly to an unobstructed vent pipe.
• Do not weld the vent pipe to the water heater's vent
collar.
• Do not cut the vent collar of the water heater.
• The vent must be easily removable from the top of the
water heater for normal service and inspection of the
unit.
• The water heater vent must not be connected to any
other gas appliance or vent stack.
• Avoid using an oversized vent pipe or using extremely
long runs of the pipe.
• Do not common vent or connect any vent from other
appliances to the water heater vent.
General rules for vent terminations:
• Avoid locating the water heater vent terminator near any air intake devices. These fans can
pick up the exhaust flue products from the water heater and return them to the building.
This can create a health hazard.
• Locate the vent terminator so that it cannot be blocked by any debris, at any time. Most
codes require that the terminator must be at least 12 in. (305 mm) above grade, but the
installer may determine if it should be higher depending on the job site condition and
applicable codes.
• A proper sidewall terminator is recommended when the water heater is vented through a
sidewall.
• Regarding the clearances from the exhaust terminator to the air inlet or opening.
Incorrect way of venting
Min
Correct way of venting
Min
11
Condensate water may
gathered at this place
Winter Summer
Power
Max
Heating
Winter Summer
Power
Max
Heating