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Lennox LGH420 User Manual

Lennox LGH420
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Page 3
Placing Unit Into Operation
WARNING
Danger of explosion and fire. Can cause
injury or product or property damage.
You must follow these instructions ex
actly.
Gas Valve Operation for White Rodgers 36H54 and
Honeywell VR8205Q/VR8305Q (figure 1 and 2)
WHITE RODGERS 36H54 GAS VALVE
Two-Stage
FIGURE 1
LOW FIRE
ADJUSTMENT
HIGH FIRE
ADJUSTMENT
INLET
PRESSURE
TAP
MANIFOLD
PRESSURE
TAP
GAS VALVE SWITCH SHOWN IN ON POSITION.
HONEYWELL VR8205Q/VR8305Q SERIES GAS VALVE
GAS VALVE KNOB IS SHOWN IN OFF POSITION
FIGURE 2
LOW FIRE
ADJUSTMENT
HIGH FIRE
ADJUSTMENT
INLET
PRESSURE
TAP
MANIFOLD
PRESSURE
TAP
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. See figure 1. On
Honeywell VR8305Q gas valves, turn knob on gas
valve clockwise
to OFF. Do not force. See
figure 2.
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. See figure 1. On
Honeywell VR8305Q gas valves, turn the knob on
the gas valve counterclockwise
to “ON”. Do not
force. See figure 2.
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 ignition sequence will start.
12- If the appliance does not light the first time (gas line
not fully purged), it will attempt up to 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 Unit
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 the knob on the gas valve clockwise
to
“OFF”. Do not force.
5- Close or replace the heat section access panel.
WARNING
Danger of explosion. Can cause injury or
death. Do not attempt to light manually.
Unit has a direct spark ignition system.

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Lennox LGH420 Specifications

General IconGeneral
BrandLennox
ModelLGH420
CategoryAir Conditioner
LanguageEnglish

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