Lennox International Inc. G20 - Manual (Page 4)

3DJH 
product. Lennox strongly recommends annual in-
spection and maintenance of this appliance. Contact
your independent Lennox dealer for an inspection by a
qualified service technician.
LIGHTING INFORMATION AND OPERATION
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
BEFORE OPERATING smell all around the appliance
area for gas. Be sure to smell next to the floor because
some gas is heavier than air and will settle on the floor.
Use only your hand to push in or turn the gas control knob
or lever. Never use tools. If the knob or lever will not push
in or turn by hand, do not try to repair it, call a qualified ser-
vice technician. Force or attempted repair may result in a
fire or explosion.
To place G20E or G20X furnace into operation:
G20E or G20X units are equipped with an intermittent pi-
lot ignition system. Do not attempt to manually light pilots
on these furnaces. Each time thermostat calls for heat,
the pilot will automatically light. The pilot does not burn
when there is no call for heat on units with electronic igni-
tions.
Gas Valve Operation (Figures 3 and 4)
1- STOP! Read the safety information at the beginning
of this section.
2- Set thermostat to lowest setting. See figure 2.
THERMOSTATS
FIGURE 2
3- Turn off all electrical power to appliance.
4- This appliance is equipped with an ignition device
which automatically lights the pilot. Do not try to light
the pilot by hand.
5- Remove control access panel.
6- Honeywell VR8204 Gas Valve - Turn the knob on the
gas valve clockwise to OFF. See figure 3.
Robertshaw 7200 Gas Valve - Depress the lever and
move to OFF position. Do not force. See figure 4.
ON
OFF
FIGURE 3
+21(<:(// 95 6(5,(6 *$6 9$/9(
GAS VALVE SHOWN IN OFF POSITION
GAS VALVE
SELECTOR
ARM
IN OFF
POSITION
52%(576+$:  *$6 9$/9(
),*85( 
7- Wait five (5) 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
instructions. If you do not smell gas go to next step.
8- Honeywell VR8204 Gas Valves - Turn the knob on
the gas valve counterclockwise to ON.
Robertshaw 7200 Gas Valve - Depress the lever and
move to ON position. Do not force.
9- Replace control access panel.
10- Turn on all electrical power to unit.
11- Set thermostat to desired setting.
NOTE-When unit is initially started, steps 1 through 11
may need to be repeated to purge air from pilot line.
12- If the furnace still will not operate, follow the instruc-
tions “To Turn Off Gas To Unit” and call your service
technician or gas supplier.
To Turn Off Gas To Unit
1- Set thermostat to lowest setting.
2- Turn off all electrical power to unit if service is to be
performed.
3- Remove control access panel.
4- Honeywell VR8204 Gas Valves - Turn the knob on the
gas valve clockwise to OFF.
Robertshaw 7200 Gas Valve - Depress the lever and
move to OFF position. Do not force.
5- Replace control access panel.