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66386-YUM-C-1011
2 Johnson Controls Unitary Products
SAFETY INFORMATION
FOR YOUR SAFETY
• 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 clear and free 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-
ing occurs, shut off the gas valve to the furnace
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 ADJUST THE THERMO-
STAT 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. (Exception 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 inter-
fere with thermostat performance. Therefore, lamps, radios,
television sets, etc. should not be placed near the thermostat.
INTERMITTENT IGNITION DEVICE
When the thermostat calls for heat, gas is supplied and at the
same time, sparking occurs to light the burner. With the
burner lit, the flame sensor rod closes a circuit to the ignitor
control which allows the burner to continue to fire.
When the room thermostat is satisfied, the electrical circuit to
the gas valve is opened, closing main burner gas. If the
burner should fail to light, contact your heating contractor or
gas utility for service to insure that proper operating condi-
tions are restored.
FIGURE 1- TYPICAL THERMOSTAT
This furnace is equipped with an intermittent auto-
matic ignition system. Do Not attempt to manually
relight the burners. Personal injury could result.