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66441-YUM-D-1011
2
Johnson Controls Unitary Products
SAFETY INFORMATION
FOR YOUR SAFETY
Make sure that the furnace area is clear and free of com-
bustible materials, gasoline and other flammable vapors 
and liquids.
Be sure the furnace is free and clear of insulating mate-
rial. Examine the furnace area after installation of the fur-
nace or the installation of additional insulation. Some 
types of insulation are combustible.
For proper operation of this furnace, air for combustion 
and ventilation is required. Make sure that these open-
ings 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 fur-
nace fails to operate, contact a qualified service techni-
cian.
Should the gas supply fail to shut off or if overheating 
occurs, shut off the gas valve to the furnace before shut-
ting 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 dangerous. 
Attempts to use the furnace can result in fire or explo-
sion. A qualified service technician should be contacted 
to inspect the furnace and to replace all gas controls, 
control system parts, electrical 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 technician 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 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
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.
FIGURE 1 - TYPICAL THERMOSTAT
This furnace is equipped with an intermittent pilot and auto-
matic re-ignition system. Do Not attempt to manually relight
the pilot. Personal injury could result.