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The gas valve on the G43UF may be equipped with either
a gas control knob or gas control lever. Use only your
hand to push the lever or turn the gas control knob. Never
use tools. If the the lever will not move or the knob will not
push in or turn by hand, do not try to repair it. Call a quali-
fied service technician. Force or attempted repair may
result in a fire or explosion.
Placing the G43UF furnace into operation:
G43UF units are equipped with an automatic hot surface
ignition system. Do not
attempt to manually light burners
on this furnace. Each time the thermostat calls for heat,
the burners will automatically light. The ignitor does not
get hot when there is no call for heat on units with this igni-
tion system.
Operating the Gas Valve (Figures 3 and 4)
1 − STOP! Read the safety information at the beginning of
this section.
2 − Set the thermostat to the lowest setting. See figure 2.
3 − Turn off all electrical power to the unit.
THERMOSTATS
FIGURE 2
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 − Switch gas valve le-
ver to OFF.
Honeywell VR8205 Gas Valve − Turn knob on gas
valve clockwise
to OFF. Do not force. See figure
4.
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 − Switch gas valve lever
to ON. See figure 3 for the White Rodgers 36G valve.
Honeywell VR8205 Gas Valve − Turn knob on gas valve
counterclockwise
to ON. Do not force.
FIGURE 3
White Rodgers 36G Series Gas Valve
GAS VALVE SHOWN IN OFF POSITION
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
OUTLET
PRESSURE
POST
INLET
PRESSURE
POST
ON
OFF
Honeywell VR8205 Series Gas Valve
GAS VALVE SHOWN IN OFF POSITION
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
MANIFOLD
PRESSURE
OUTLET
FIGURE 4
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 service tech-
nician or gas supplier.
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 − Switch gas valve le-
ver to OFF.
Honeywell VR8205 Gas Valve − Turn knob on gas
valve clockwise
to OFF. Do not force.
5 − Replace the upper access panel.
Filters
All G43UF filters are installed external to the unit. Filters
should be inspected monthly. Clean or replace the filters
when necessary to ensure proper furnace operation. Re-
placement filters must be rated for high velocity airflow.
Table 1 lists recommended filter sizes.
A filter must be in place when the unit is operating.