Page 34
6 − Adjust the thermostat to deactivate the heating de-
mand and wait for the combustion air inducer to stop.
At this point, the trap should be primed with sufficient
water to ensure proper condensate drain operation.
BEFORE LIGHTING the unit, smell all around the fur-
nace 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 is equipped with a gas con-
trol switch (lever). Use only your hand to move switch.
Never use tools. If the the switch will not move by hand,
do not try to repair it. Force or attempted repair may result
in a fire or explosion.
Placing the 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 these units.
WARNING
If you do not follow these instructions exactly, a fire
or explosion may result causing property damage,
personal injury or death.
Gas Valve Operation (Figures 45 and 46)
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 45 for White Rodgers 36G
valve.
Honeywell VR8205 Gas Valve − Move gas valve
switch to OFF. See figure 46 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 45 for White Rodgers 36G
valve.
Honeywell VR8205 Gas Valve − Move gas valve
switch to ON. See figure 46 for Honeywell VR8205
valve.
White Rodgers 36G Series Gas Valve
GAS VALVE SHOWN IN OFF POSITION
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
(under cap)
OUTLET
PRESSURE
POST
INLET
PRESSURE
POST
FIGURE 45
GAS VALVE SHOWN IN ON POSITION
Honeywell VR8205 Gas Valve
MANIFOLD
PRESSURE
OUTLET
INLET
PRESSURE
PORT
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
(under
barbed
fitting)
FIGURE 46
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 instructions
Turning Off Gas to Unit" and call your service techni-
cian or gas supplier.
Turning Off Gas to 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 gas valve
switch to OFF.
5 − Replace the upper access panel.
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