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363857-YUM-A-0208
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 spark ignition device. It
has a Relight control designed to automatically light the burn-
ers each time the thermostat controller “calls” for heat.
When the controller calls for heat, gas is supplied to the Inte-
gral Crossover Burners and at the same time, sparking
occurs to light the main burner gas. A flame sensor closes a
circuit to the ignitor control which proves that all of the burn-
ers have ignited properly.
On initial start-up, air may be in the gas lines. Several tries for
ignition may be required before the gas will carry over and
the heat sections remains lit. The ignition model has 3 trials
for ignition. If the ignition module locks out, it may be neces-
sary to remove re-establish the call for heat W1 or W2 to con-
tinue the purging process.
When the controller is satisfied, the electrical circuit to the
gas valve is opened, closing off the flow of gas to the main
burner.
If the burners should fail to light, contact your heating con-
tractor or gas company for service to insure that proper oper-
ating conditions are restored.
In the event that gas to the main burner has been shut-off,
DO NOT attempt to place the furnace into operation. Call the
appropriate service agency.
FIGURE 1 - TYPICAL THERMOSTAT
This furnace is equipped with an intermittent spark and
automatic re-ignition system. Do Not attempt to manually
relight the pilot. Personal injury could result.