Lennox LGT Series Unit Information page 35

Placing Furnace In Operation
1 - Set thermostat to lowest setting.
2 - Turn off all electrical power to appliance.
3 - This appliance is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
4 - Open or remove the heat section access panel.
5 - Turn gas valve switch to "OFF". Do not force.
6 - 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 the next step.
7 - Turn gas valve switch to "ON". Do not force.
8 - Close or replace the heat section access panel.
9 - Turn on all electrical power to appliance.
10 - Set thermostat to desired setting.
11 - The combustion air inducer will start. The burners
will light within 40 seconds.
12 - If the appliance does not light the first time (gas line
not fully purged), it will attempt two more ignitions
before locking out.
13 - If lockout occurs, repeat steps 1 through 10.
14 - If the appliance will not operate, follow the
instructions "Turning Off Gas to Appliance" and call
your service technician or gas supplier.
Turning Off Gas to Appliance
1 - If using an electromechanical thermostat, set to the
lowest setting.
2 - Before performing any service, turn off all electrical
power to the appliance.
3 - Open or remove the heat section access panel.
4 - Turn gas valve clockwise to "OFF". Do not force.
D-Safety or Emergency Shutdown
Turn off power to the unit. Close manual and main gas
valves.
WHITE RODGERS 36H54 GAS VALVE
Outlet Pressure
Tap
High Fire Adjustment
(under cap)
GAS VALVE SWITCH SHOWN IN ON POSITION.
Page 35
Two-Stage
Inlet Pressure Tap
Low Fire Adjustment
(under cap)
FIGURE 24