11
Thermostat Location
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.
COMBUSTION & VENTILATION REQUIREMENTS
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 burning 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 carbon 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 B1491-
15 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.
INSTALLATION POSITIONS
This furnace may be installed in an upright position or
horizontal on either the left or right side panel. Do not
install this furnace on its back. For
upright upflow
furnaces,
return air ductwork may be attached to the side panel(s)
and/or basepan. For
horizontal upflow
furnaces, return
air ductwork must be attached to the basepan. For
both
upright or horizontal counterflow
furnaces, return
ductwork must be attached to the basepan (top end of
the blower compartment).
NOTE:
Ductwork must never
be attached to the back of the furnace. Contact your
distributor for proper airflow requirements and number of
required ductwork connections. Refer to “Recommended
Installation Positions” figure for appropriate installation
positions, ductwork connections, and resulting airflow
arrangements.
HORIZONTAL APPLICATIONS &
CONSIDERATIONS
2" 2" 3/8"
ANGLE
IRON
(3
PLACES
)
X X
Figure 2
When installing a furnace horizontally, additional consideration
must be given to the following:
Furnace Suspension
If suspending the furnace from rafters or joists, use 3/8”
threaded rod and 2”x2”x1/8” angle iron as shown in the
following diagram. The length of rod will depend on the
application and the clearances necessary.
If the furnace is installed in a crawl space it must be
suspended from the floor joist or supported by a concrete
pad. Never install the furnace on the ground or allow it to
be exposed to water.
Front Cover Pressure Switch Tube Location
When a furnace is installed horizontally with left side down,
the front cover pressure switch tube must be re-located to
the lower port of the collector box cover.
1. Remove tube from front cover pressure switch and
collector box cover.
2. Remove rubber plug from bottom collector box port
and install on top collector box port.
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