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The gas valve on the G40UH(X) will be equipped with ei-
ther a gas control knob or lever. Use only your hand to turn
the gas control knob or push the gas lever. Never use
tools. If the knob or lever will not move by hand, do not try
to repair it. Call a qualified service technician. Force or at-
tempted repair may result in a fire or explosion.
Placing the G40UH(X) furnace into operation:
G40UH(X) units are equipped with a SureLight ignition
system. Do
not
attempt to manually light burners on these
furnaces. Each time thermostat calls for heat, the burners
will automatically light. The ignitor does not get hot when
there is no callfor heat on units withthe SureLight ignition
system.
Operating the Gas Valve (Figures 3, 4 and 5)
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 36E/36F Gas Valve -
Switch gas
valve lever to
OFF
.
Honeywell VR8205 Gas Valve -
Turn knob on gas
valve clockwise
to
OFF
.Do notforce.See figure
5.
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 36E/36F Gas Valve -
Switch gas valve le-
ver to
ON
. See figure 3 for the White Rodgers 36E
valve and figure 4 for the White Rodgers 36F valve.
Honeywell VR8205 Gas Valve -
Turn knob on gas valve
counterclockwise
to
ON
. Do not force.
White Rodgers 36E Series Gas Valve
GAS VALVE SHOWN IN OFF POSITION
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
MANIFOLD
PRESSURE
OUTLET
FIGURE 3
White Rodgers 36F Series Gas Valve
GAS VALVE SHOWN IN OFF POSITION
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
MANIFOLD
PRESSURE
OUTLET
FIGURE 4
ON
OFF
Honeywell VR8205 Series Gas Valve
GAS VALVE SHOWN IN OFF POSITION
MANIFOLD
PRESSURE
ADJUSTMENT
SCREW
MANIFOLD
PRESSURE
OUTLET
FIGURE 5
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.