10
•
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.
HOT
COLD
Thermostat Influences
Consult the instructions packaged with the thermostat for mount-
ing instructions and further precautions.
C
OMBUSTION
AND
V
ENTILATION
A
IR
R
EQUIREMENTS
T
O
AVOID
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
,
SUFFICIENT
FRESH
AIR
FOR
PROPER
COMBUSTION
AND
VENTILATION
OF
FLUE
GASES
MUST
BE
SUPPLIED
.
M
OST
HOMES
REQUIRE
OUTSIDE
AIR
BE
SUPPLIED
INTO
THE
FURNACE
AREA
.
WARNING
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
heating/cooling costs but have created a problem supplying
combustion and ventilation air for gas fired and other fuel burn-
ing appliances. Appliances that pull air out of the house (clothes
dryers, exhaust fans, fireplaces, etc.) increase the problem by
starving appliances for air.
House depressurization can cause back drafting or improper
combustion of gas-fired appliances, thereby exposing building
occupants to gas combustion products that could include car-
bon monoxide.
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.
This furnace must use indoor air for combustion. It cannot be
installed as a direct vent (i.e., sealed combustion) furnace.
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.
C
ATEGORY
I V
ENTING
(V
ERTICAL
V
ENTING
)
T
O
PREVENT
POSSIBLE
PERSONAL
INJURY
OR
DEATH
DUE
TO
ASPHYXIATION
,
THIS
FURNACE
MUST
BE
C
ATEGORY
I
VENTED
.
D
O
NOT
VENT
USING
C
ATEGORY
III
VENTING
.
WARNING
Category I Venting is venting at a non-positive pressure. A
furnace vented as Category I is considered a fan-assisted ap-
pliance and the vent system does not have to be “gas tight.”
NOTE:
Single stage gas furnaces with induced draft blowers
draw products of combustion through a heat exchanger allow-
ing, in some instances, common venting with natural draft ap-
pliances (i.e. water heaters). All installations must be vented in
accordance with National Fuel Gas Code NFPA 54/ANSI Z223.1
- latest edition. In Canada, the furnaces must be vented in ac-
cordance with the National Standard of Canada, CAN/CSA
B149.1 and CAN/CSA B149.2 - latest editions and amendments.
NOTE:
The vertical height of the Category I venting system
must be at least as great as the horizontal length of the venting
system.
T
O
PREVENT
POSSIBLE
PERSONAL
INJURY
OR
DEATH
DUE
TO
ASPHYXIATION
,
COMMON
VENTING
WITH
OTHER
MANUFACTURER
’
S
INDUCED
DRAFT
APPLIANCES
IS
NOT
ALLOWED
.
WARNING
The minimum vent diameter for the Category I venting system
is as shown:
UPFLOW COUNTERFLOW
060
4 inch
4 inch
080
4 inch
4 inch
100
5 inch
4 inch
MINIMUM VENT
MODEL
Under some conditions, larger vents than those shown above
may be required or allowed.
When an existing furnace is re-
moved from a venting system serving other appliances
, the
venting system may be too large to properly vent the remaining
attached appliances.
Upflow or Horizontal units
are shipped with the induced draft
blower discharging from the top of the furnace. (“Top” is as
viewed for an upflow installation.) The induced draft blower can
be rotated 90 degrees for Category I venting. For horizontal
installations, a four inch single wall pipe can be used to extend
the induced draft blower outlet 1/2” beyond the furnace cabinet.
THIS PRODUCT IS NOT DESIGNED FOR COUNTERCLOCK-
WISE INDUCED DRAFT BLOWER ROTATION.
