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49-6000245 Rev. 0 15
AIR SUPPLY AND VENTILATION
Proper air supply and ventilation are essential to
the safe, effective operation of this residential gas
water heater. Air supply and ventilation must be
in accordance with local codes or, in the absence
of local codes, the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or the Natural Gas and Propane
Installation Code, CSA B149.1.
Air Supply
If the water heater is installed in an open room of
a conventionally constructed building, sufficient
air is typically present for proper combustion and
ventilation. However, if the water heater is installed
in a confined space or tightly insulated home,
additional provisions must be made for combustion
and ventilation air. A confined space offers less than
50 cubic feet of air per 1,000 BTUH (British thermal
units per hour) for the appliances in that space.
Each appliance’s BTUH requirements should be
listed on its rating plate.
Without an adequate supply of clean air, the water
heater’s pilot light will not function properly, and
excessive amounts of carbon monoxide may be
produced.
Corrosive Atmospheres
A corrosive atmosphere is created when compounds
from aerosol sprays, cleaning products such as
bleach and detergents or other chemicals become
airborne and are drawn into the combustion air
supply of a water heater or other gas appliance.
When these compounds pass through the gas
flame, they create corrosive elements that shorten
the life of the appliance. Damage due to a corrosive
atmosphere is not covered under the warranty.
Installation Instructions
INSTALLATION INSTRUCTIONS
THERMAL EXPANSION
If the home’s inlet water line includes a check valve,
this will prevent water from flowing back into the
city’s water supply, creating a closed water system in
the home. Heated water expands, causing increased
pressure, which is then trapped in a closed water
system. Referred to as thermal expansion, this rapid
pressure increase can cause the water heater’s
relief valve to operate (releasing water) during
heating cycles, potentially causing premature failure
of the valve or the water heater. To control thermal
expansion, install a thermal expansion tank in the
cold water line between the water heater and check
valve, as shown in the next illustration, page 16.
Contact your installing contractor, water supplier or
plumbing inspector for additional information.
AIR SUPPLY AND VENTILATION
(Cont.)
Ventilation
The ventilation system for this water heater must be
properly installed by a qualified service technician
and free from any obstructions. The vent should
not be shared by any power-vented appliance, nor
should a damper be used anywhere in the system.
The new vent hood (provided with the water heater)
must be attached to the gas vent or chimney by vent
pipes. The diameter of the vent pipes must match
that of the vent hood or be larger.
At least 12” of vertical vent pipe is recommended
from the vent hood. Horizontal pipes must maintain
a vertical pitch of at least 1/4” per foot, and the
termination must be vertical. Vent joints must be
secured by an approved method, such as sheet
metal screws.
After the water heater’s main burner has been in
operation for 5 minutes, the vent hood can be tested
for spillage by holding a lighted match or candle
close to the vent hood relief opening. The smoke or
flame should be pulled towards the opening.
For additional information, consult local codes, the
National Fuel Gas Code, ANSI Z223.1/NFPA 54 or
the Natural Gas and Propane Installation Code, CSA
B149.1.
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