Lennox LGH094U Unit Information page 56

C-Heating Start-up
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING
Danger of explosion. Can cause injury
or product or property damage. If over­
heating occurs or if gas supply fails to
shut off, shut off the manual gas valve
to the appliance before shutting off
electrical supply.
WARNING
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
BEFORE LIGHTING 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.
Never use tools. If the knob will not push in or 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.
IMPORTANT
Units equipped with a Hot Gas Reheat system MUST be
charged in standard cooling mode.
In case of a safety shutdown, move thermostat switch to
OFF and return the thermostat switch to HEAT to reset igni­
tion control.
Placing Furnace In Operation
Gas Valve Operation for White Rodgers 36C and
Honeywell VR8205Q/VR8305Q (figure 37)
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 the knob on the gas valve clockwise
Depress 36C knob slightly. Do not force.
6- Wait five (5) minutes to clear out any gas. If you then
smell gas, STOP! Immediately call your gas suppli­
er from a neighbor's phone. Follow the gas supplier's
instructions. If you do not smell gas, go to the next step.
7- Turn the knob on the gas valve counterclockwise
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 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 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 the knob on the gas valve clockwise
Depress 36C knob slightly. Do not force.
D-Safety or Emergency Shutdown
Turn off power to the unit. Close manual and main gas valves.
WHITE-RODGERS 36C76 GAS VALVE
INLET
PRESSURE
TAP (SIDE)
HONEYWELL VR8305/VR8205 GAS VALVE
HIGH FIRE
ADJUSTMENT
to "OFF".
INLET
PRESSURE
TAP
Page 56
STAGE 2 MANUAL MANIFOLD
PRESSURE ADJUSTMENT
SCREW UNDER CAP
GAS VALVE
SHOWN IN "OFF"
POSITION
D-1
GV-1
GV-2
GAS VALVE SHOWN IN
LOW FIRE
ADJUSTMENT
FIGURE 37
to "OFF".
OUTLET
PRESSURE
TAP (SIDE)
C-1
C2
"OFF" POSITION
OUTLET
PRESSURE
TAP