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GAS CONTROL KNOB SETTINGS
The gas control knob has three settings:
OFF—prevents pilot and main burner gas flow.
PILOT—permits pilot gas flow only. Gas control
knob must be held depressed or thermocouple must be
heated sufficiently to hold the safety control valve
open.
ON—permits main burner and pilot gas flow. Thermostat
and gas control control main burner gas flow.
NOTE: Gas controls are shipped with the gas control knob in
the ON position.
PERFORM GAS LEAK TEST
!
WARNING
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE,
SEVERE INJURY, OR DEATH
Check for gas leaks with rich soap and water
solution any time work is done on a gas control.
GAS LEAK TEST
1. Paint all pipe connections upstream of the gas control
with a rich soap and water solution. Bubbles indicate a gas
leak.
2. If a gas leak is detected, tighten the pipe connection.
3. Stand clear while lighting main burner to prevent
injury caused from hidden gas leaks which could cause
flashback in the appliance vestibule. Light the main burner.
4. With the main burner in operation, paint all pipe joints
(including adapters) and gas control inlet and outlet with rich
soap and water solution.
5. If another gas leak is detected, tighten adapter screws,
joints, and pipe connections.
6. Replace the part if gas leak cannot be stopped.
LIGHT THE PILOT BURNER FLAME
1. Turn the gas control knob clockwise
Wait five minutes to dissipate any unburned gas. Sniff around
the appliance near the floor. Do not relight the pilot flame if
you smell gas.
2. Turn the gas control knob counterclockwise
PILOT. Push down and hold the gas control knob while
lighting the pilot flame.
3. Hold the gas control knob down about one minute, then
release.
• If the pilot flame goes out, turn the gas control knob
clockwise
• If pilot flame remains lit, turn the gas control knob
counterclockwise
ADJUST THE PILOT BURNER FLAME
The pilot flame should envelop 3/8 to 1/2 inch [10 to 13
millimeters] of the thermocouple tip. Refer to Fig. 9. To
adjust the pilot flame:
1. Remove the pilot adjustment cover screw. Refer to Fig.
1.
2. Turn the inner adjustment screw clockwise
decrease or counterclockwise
flame.
to OFF and repeat steps 1 through 3.
to ON.
to increase the pilot
Fig. 9—Proper flame adjustment.
PROPER FLAME
ADJUSTMENT
3. Always replace the cover screw after adjustment and
tighten firmly to ensure proper operation.
LIGHT MAIN BURNER
Follow the appliance manufacturer's instructions or set
the thermostat setting above room temperature to call for
heat.
CHECK AND ADJUST GAS INPUT TO MAIN
BURNER
!
CAUTION
1. Do not exceed the input rating stamped on the
2. IF CHECKING GAS INPUT BY CLOCKING
to OFF.
to
3. IF CHECKING GAS INPUT WITH A MA-
to
6
3/8 TO 1/2 IN.
(10 TO 13 MM)
THERMOCOUPLE
appliance nameplate, or manufacturer's recom-
mended burner orifice pressure for the size
orifice used. Ensure the main burner primary air
supply is properly adjusted for complete com-
bustion (refer to the appliance manufacturer's
instructions).
THE GAS METER:
• Ensure that the only gas flow through the
meter is that of the appliance being tested.
• Ensure that other appliances are turned off
and that their pilot burners are extinguished
(or deduct their gas consumptions from the
meter reading).
• Convert the flow rate to Btuh as described in
the Gas Controls Handbook (form number
70-2602) and compare to the Btuh input
rating on the appliance nameplate.
NOMETER (PRESSURE GAUGE):
• Ensure the gas control knob is in the PILOT
position before removing the outlet pressure
tap plug to connect the manometer.
• Turn the gas control knob back to PILOT
when removing the manometer and replac-
ing outlet pressure tap plug.
• Shut off the gas supply at the appliance
service valve or, for LP gas, at the gas tank
before removing outlet the pressure tap plug
and before disconnecting the manometer and
replacing the outlet pressure tap plug.
• Perform the Gas Leak Test at the inlet pres-
sure tap plug.
M3086B
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