Lennox International Inc. G40DF(X) SERIES - Manual (Page 4)

Page 4
The gas valve on the G40DF(X) will be equipped with eiĆ
ther a gas control knob or lever. Use only your hand to turn
the gas control knob or push the gas lever. Never use
tools. If the knob or lever will not move by hand, do not try
to repair it. Call a qualified service technician. Force or atĆ
tempted repair may result in a fire or explosion.
Placing the G40DF(X) furnace into operation:
G40DF(X) units are equipped with a SureLightt ignition
system. Do not attempt to manually light burners on these
furnaces. Each time thermostat calls for heat, the burners
will automatically light. The ignitor does not get hot when
there is no call for heat on units with the SureLightt ignition
system.
Operating the Gas Valve (Figures 3, 4 and 5)
1 - STOP! Read the safety information at the beginning of
this section.
2 - Set the thermostat to the lowest setting. See figure 2.
3 - Turn off all electrical power to the unit.
THERMOSTATS
FIGURE 2
4 - This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
5 - Remove the lower access panel.
6 - White Rodgers 36E/36F Gas Valve - Switch gas
valve lever to OFF.
Honeywell VR8205 Gas Valve - Turn knob on gas
valve clockwise
to OFF. Do not force. See figure
5.
7 - Wait five minutes to clear out any gas. If you then smell
gas, STOP! Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's instrucĆ
tions. If you do not smell gas go to next step.
8 - White Rodgers 36E/36F Gas Valve - Switch gas valve leĆ
ver to ON. See figure 3 for the White Rodgers 36E
valve and figure 4 for the White Rodgers 36F valve.
Honeywell VR8205 Gas Valve - Turn knob on gas valve
counterclockwise
to ON. Do not force.
FIGURE 3
White Rodgers 36E Series Gas Valve
GAS VALVE SHOWN IN OFF POSITION
Gas
Valve
Lever
FIGURE 4
White Rodgers 36F Series Gas Valve
GAS VALVE SHOWN IN OFF POSITION
Gas
Valve
Lever
FIGURE 5
ON
OFF
Honeywell VR8205 Series Gas Valve
GAS VALVE SHOWN IN OFF POSITION
Gas
Valve Knob
9 - Replace the lower access panel.
10 - Turn on all electrical power to to the unit.
11 - Set the thermostat to desired setting.
NOTE - When unit is initially started, steps 1 through 11
may need to be repeated to purge air from gas line.
12- If the appliance will not operate, follow the section
Turning Off Gas to the Unit" and call your service techĆ
nician or gas supplier.
Turning Off Gas to the Unit
1 - Set the thermostat to the lowest setting.
2 - Turn off all electrical power to the unit if service is to be
performed.
3 - Remove the lower access panel.