OPERATING YOUR UNIT
These units are equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
Before operating, smell around furnace area for gas. Be sure
to smell near the unit base because some gas is heavier than
air and will settle to the lowest point. See WHAT TO DO IF
YOU SMELL GAS on page 1if the odor of gas is present.
Use only your hand to slide the gas control switch; never
use tools. If the switch will not move by hand, don't try to
repair it. Call a qualified service technician. Force or
attempted repair may result in a fire or explosion.
Lighting Instructions
1. STOP! Read the previous safety information.
2. Set the thermostat to the lowest setting.
3. Turn off all electric power to the unit.
4. Remove the burner compartment access panel.
5. This appliance is equipped with an automatic ignition
device. Do not try to light the burners by hand.
6. Turn the gas control knob, or slide the gas control
switch, to "OFF" (see Figure 1).
Gas Valves
Gas
Control
Knob
Gas Control Switch
Figure 1
,
Wait 5 minutes to clear out any gas, then smell for
gas (including at the bottom of the unit near the
ground). If you smell gas, stop and follow the direc-
tions in WHAT TO DO IF YOU SMELL GAS on page
1. If you don't smell gas, continue to next step.
8. Turn the gas control knob, or slide the gas control
switch, to "ON".
9. Replace the burner compartment access panel.
10. Turn on all electric power to the unit.
11. Set the thermostat to the desired setting.
12. If the unit will not operate, follow the instructions found
below in To Turn Off Gas to Unit and call your
service technician or gas supplier.
Operating Sequence
When the thermostat calls for heat, the vent motor will
purge the system for 30 seconds (nominal). When the
prepurge time has expired, the gas valve will open for direct
ignition. When burners are lit, the flame sensor will sense
flame and keep the gas valve open. If the flame sensor
does not sense that a flame has been established, it will
shut off the gas valve. The ignition system is designed to go
through three trials for ignition. If flame still has not been
established after the third trial, the system will go into
lockout. After 1 hour, the system will try three more times.
If the system goes into lockout, it can be reset by turning
your thermostat down or off for 10 seconds and then back
to the desired point.
When the room thermostat is satisfied, the electrical circuit
to the gas valve is opened and the burners are shut off.
Shutting Down the Unit
Toshut down the unit, set the thermostat to the "OFF" position.
To Turn Off Gas to Unit
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the unit if service is to be
performed.
3. Remove the burner compartment access panel.
4. Turn the gas control knob, or slide the gas control
switch, to "OFF" (see Figure 1). Do not force.
5. Replace the burner compartment access panel.
#48368H005 Page3
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