Lennox International Inc. G24M SERIES - Manual (Page 4)

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Placing Furnace Into Operation
G24M units are equipped with an electronic ignition system.
Do not attempt to manually light burners on these furnaces.
Each time the thermostat calls for heat, the burner will auto-
matically light.
Use only your hand to turn the gas control knob. Never use
tools. If the knob will not turn by hand, do not try to repair it,
call a qualified service technician. Force or attempted repair
may result in a fire or explosion.
THERMOSTATS
FIGURE 1
Gas Valve Operation
1 - STOP! Read the safety information at the beginning
of this section.
2 - Set the thermostat to lowest setting. See figure 1.
3 - Turn off all electrical power to the unit.
4 - This furnace Is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
5 - Remove the access panel.
6 - White Rodgers 36E Gas Valve - Turn knob on gas valve
180
G either way to OFF. See figure 2.
Honeywell VR8205 Gas Valve - Turn knob on gas valve
clockwise
to OFF. Do not force. See figure 3.
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.
WHITE RODGERS 36E SERIES GAS VALVE
GAS VALVE SHOWN IN OFF POSITION
FIGURE 2
ON
OFF
HONEYWELL VR8205 SERIES GAS VALVE
GAS VALVE SHOWN IN OFF POSITION
FIGURE 3
8 - White Rodgers 36E Gas Valve - Turn knob on gas
valve 180
G
either way to ON.
Honeywell VR8205 Gas Valve - Turn knob on gas
valve counterclockwise
to ON. Do not force.
9 - Replace the access panel.
10- Turn on all electrical power to 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 instruc-
tions “Turning Off Gas to Unit” and call your service
technician or gas supplier.
Turning Off Gas to 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 access panel.
4 - Turn knob on White Rodgers gas valve 180
G
either way
to OFF; turn knob on Honeywell valve clockwise to
OFF. Do not force.
5 - Replace the access panel.
Filters
G24M series units are equipped with external filters which
should be inspected monthly and replaced when neces-
sary to assure proper furnace operation. See table 1 for
filter sizes. Replacement filters used with G24M-40/60/75
units must have a minimum velocity rating of 400 FPM.
Replacement filters used with G24M-100/120/140 units
require a minimum velocity rating of 625 FPM. Figures 4,
5 and 6 show possible filter locations.
TABLE 1
FILTER SIZE
MODEL NUMBER
UPFLOW DOWNFLOW
1 FILTER 2 FILTERS
G24M-45/60/75 16 in. X 20 in. X 1 in. 16 in. X 20 in. X 1 in.
G24M-100/120/140 20 in. X 20 in. X 1 in. 16 in. X 20 in. X 1 in.