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035-18843-000-A-0402
2 UnitaryProductsGroup
SAFETY INFORMATION
FORYOURSAFETY
• Make sure that the furnace area is clear and free of
combustible materials, gasoline and other flamma-
ble vapors and liquids.
• Be sure the furnace is free and clear of insulating
material. Examine the furnace area after installa-
tion of the furnace or the installation of additional
insulation. Some types of insulation are combusti-
ble.
• For proper operation of this furnace, air for com-
bustion and ventilation is required. Make sure that
these openings are not obstructed.
• For lighting or shutting down this furnace, refer to
the lighting instructions provided adjacent to the
burners and also located in this manual.
• A blocked vent roll-out switch is provided in the
burner compartment. This switch is a manual reset.
If the furnace fails to operate, contact a qualified
service technician.
• Should the gas supply fail to shut off or if overheat-
ingoccurs,shutoffthegasvalvetothefurnace
before shutting off the electrical supply. Then call a
qualified service technician.
• Do not use this furnace if any part has been under
water. A flood-damaged furnace is extremely dan-
gerous. Attempts to use the furnace can result in
fire or explosion. A qualified service technician
should be contacted to inspect the furnace and to
replace all gas controls, control system parts, elec-
trical parts that have been wet or the furnace if
deemed necessary.
• Determine the integrity of the installation regarding
the flue gas vent, the return and supply air duct.
Confirm the equipment is well supported and there
are no signs of deterioration. The manufacturer
recommends that main burner, ignition device and
controls are inspected by a qualified service techni-
cian before each heating season.
SYSTEM OPERATION
THERMOSTATS
Set your thermostat for either heating or cooling then
set it for the desired temperature. DO NOT MOVE THE
THERMOSTAT RAPIDLY ON AND OFF, OR BACK
AND FORTH FROM HEAT TO COOL. THIS COULD
DAMAGE YOUR EQUIPMENT.
Always allow at least 5 minutes between changes. Find
the temperature that is most comfortable to you, and
then LEAVE YOUR THERMOSTAT ALONE. (Excep-
tion is for night or vacation “set back” to conserve
energy).
Manually moving the thermostat up or down will not
speed up temperature changes in your rooms. This
only causes the thermostat switch to function at your
command rather than responding to room temperature.
Heat generated by devices other than the furnace may
interfere with thermostat performance. Therefore,
lamps, radios, television sets, etc. should not be placed
near the thermostat.
INTERMITTENT IGNITION DEVICE
Your unit is equipped with a cycling pilot burner. It has a
Pilot Relight control designed to automatically light the
pilot burner each time the thermostat “calls” for heat.
When the thermostat calls for heat, pilot gas is supplied
and at the same time, sparking occurs to light the pilot
gas. With the pilot lit, the flame sensor rod closes a cir-
cuit to the ignitor control which then opens the gas
valve to admit main burner gas.
FIGURE 1: TYPICAL THERMOSTAT
This furnace is equipped with an intermittent pilot and
automatic re-ignition system.
Do Not attempt to man-
ually relight the pilot. Personal injury could result.