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T
L
HERMOSTAT
OCATION
The thermostat should be placed approximately five feet from the floor on a vibration-free, inside wall in an area having good air
circulation. Do not install the thermostat where it may be influenced by any of the following:
• Drafts, or dead spots behind doors, in corners, or under cabinets.
• Hot or cold air from registers.
• Radiant heat from the sun.
• Light fixtures or other appliances.
• Radiant heat from a fireplace.
• Concealed hot or cold water pipes, or chimneys.
• Unconditioned areas behind the thermostat, such as an outside wall.
Consult the instructions packaged with the thermostat for mounting instructions and further precautions.
C
& V
OMBUSTION
ENTILATION
Improved construction and additional insulation in buildings have
reduced heat loss by reducing air infiltration and escape around
doors and windows. These changes have helped in reducing heat-
ing/cooling costs but have created a problem supplying combus-
tion and ventilation air for gas fired and other fuel burning appli-
ances. Appliances that pull air out of the house (clothes dryers,
exhaust fans, fireplaces, etc.) increase the problem by starving
appliances of air.
House depressurization can cause back drafting or improper combustion of gas-fired appliances, thereby exposing building occu-
pants to gas combustion products that could include carbon monoxide.
When the furnace is installed as a direct vent (2-pipe system) furnace, no special provisions for air for combustion are
required. However, if this furnace is to be installed in the same space with other gas appliances, such as a water heater, ensure
there is an adequate supply of combustion and ventilation air for the other appliances. Refer to the latest edition of the National
Fuel Gas Code NFPA 54/ANSI Z223.1 or CAN/CSA B149 Installation Codes or applicable provisions of the local building codes for
determining the combustion air requirements for the appliances.
Most homes will require outside air be supplied to the furnace area by means of ventilation grilles or ducts connecting directly to
the outdoors or spaces open to the outdoors such as attics or crawl spaces.
The following information on air for combustion and ventilation is reproduced from the National Fuel Gas Code NFPA 54/ANSI Z223.1
Section 9.3.
9.3* Air for Combustion and Ventilation.
9.3.1 General.
9.3.1.1 Air for combustion, ventilation, and dilution of flue gases for appliances installed in buildings shall be obtained by application of one of the
methods covered in 9.3.2 through 9.3.6. Where the requirements of 9.3.2 are not met, outdoor air shall be introduced in accordance with methods covered
in 9.3.3 through 9.3.6.
Exception No. 1: This provision shall not apply to direct vent appliances.
9.3.1.2 Appliances of other than natural draft design and other than Category 1 vented appliances shall be provided with combustion, ventilation, and
dilution air in accordance with the appliance manufacturer's instructions.
9.3.1.3 Appliances shall be located so as not to interfere with proper circulation of combustion, ventilation, and dilution air.
9.3.1.4 Where used, a draft hood or a barometric draft regulator shall be installed in the same room or enclosure as the appliance served so as to prevent
any difference in pressure between the hood or regulator and the combustion air supply.
9.3.1.5 Makeup air requirements for the operation of exhaust fans, kitchen ventilation systems, clothes dryers, and fireplaces shall be considered in
determining the adequacy of a space to provide combustion air requirements.
9.3.2 Indoor Combustion Air. The required volume of indoor air shall be determined in accordance with the method in 9.3.2.1 or 9.3.2.2 except that
10
A
R
IR
EQUIREMENTS
T
,
O AVOID PROPERTY DAMAGE
SUFFICIENT FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF
. M
FLUE GASES MUST BE SUPPLIED
SUPPLIED INTO THE FURNACE AREA
WARNING
,
PERSONAL INJURY OR DEATH
OST HOMES REQUIRE OUTSIDE AIR BE
.
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