Lennox G43UF SERIES User's Information Manual page 4

DANGER
Danger of explosion.
There are circumstances in which odorant used with
LP/propane gas can lose its scent. In case of a leak,
LP/propane gas will settle close to the floor and may
be difficult to smell. An LP/propane leak detector
should be installed in all LP applications.
Do not attempt to bleed the gas lines of air. Call your
local gas provider.
Lighting Information & Operation
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
BEFORE LIGHTING the unit, smell all around the ap-
pliance area for gas. Be sure to smell next to the floor be-
cause some gas is heavier than air and will settle on the
floor.
The gas valve on the G43UF will be equipped with a gas
control switch. Use only your hand to move the switch. Nev-
er use tools. If the switch will not move by hand, do not try to
repair it. Call a licensed professional service technician (or
equivalent). Force or attempted repair may result in a fire or
explosion.
Placing the G43UF furnace into operation:
G43UF units are equipped with an ignition system. Do not
attempt to manually light burners on this furnace. Each
time the thermostat calls for heat, the burners will automati-
cally light. The ignitor does not get hot when there is no call
for heat on units with this ignition system.
Operating the Gas Valve (Figures 2 and 3)
1 − STOP! Read the safety information at the beginning of
this section.
2 − Set the thermostat to the lowest setting.
3 − Turn off all electrical power to the unit.
4 − This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.
5 − Remove the upper access panel.
6 − White Rodgers 36G Gas Valve − Move gas valve
switch to OFF. See figure 2 for the White Rodgers 36G
valve.
Honeywell VR8205 Gas Valve − Move switch on gas
valve to OFF. See figure 3 for Honeywell VR8205
valve.
7 − Wait five 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 instruc-
tions. If you do not smell gas go to next step.
8 − White Rodgers 36G Gas Valve − Move gas valve
switch to ON. See figure 2 for the White Rodgers 36G
valve.
Honeywell VR8205 Gas Valve − Move switch on gas
valve to ON. See figure 3 for Honeywell VR8205 valve.
White Rodgers 36G Series Gas Valve
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
OUTLET
PRESSURE
POST
GAS VALVE SHOWN IN OFF POSITION
Honeywell VR8205 Series Gas Valve
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
GAS VALVE SHOWN IN ON POSITION
9 − Replace the upper access panel.
10 − Turn on all electrical power to to the 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 section
Turning Off Gas to the Unit" and call your licensed pro-
fessional service technician (or equivalent).
Turning Off Gas to the 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 upper access panel.
4 − White Rodgers 36G Gas Valve − Move gas valve
switch to OFF.
Honeywell VR8205 Gas Valve − Move switch on gas
valve OFF.
5 − Replace the upper access panel.
Page 4
INLET
PRESSURE
POST
FIGURE 2
MANIFOLD
PRESSURE
OUTLET
FIGURE 3