Start-up and Checkout
WARNING
FIRE OR EXPLOSION HAZARD CAN
CAUSE PROPERTY DAMAGE, SEVERE
INJURY, OR DEATH
1. Do not force the gas control knob. Use only your
hand to push down the reset button or turn the
gas control knob. Never use any tools.
2. If the gas control knob or reset button will not
operate by hand, or if the reset button stays
depressed after it is released, the gas control
should be replaced by a qualified service techni-
cian.
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. Gas control
and thermostat 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 that could cause flash-
back 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 to OFF. 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 to
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
to OFF and repeat steps 1 through 3.
• If pilot flame remains lit, turn the gas control knob
counterclockwise
to ON.
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. 5.
2. Turn the inner adjustment screw clockwise to
decrease or counterclockwise
to increase the pilot flame.
3. Always replace the cover screw after adjustment and
tighten firmly to assure proper operation.
6
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LIGHT MAIN BURNER
Follow the appliance manufacturer’s instructions or place
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
appliance nameplate, or manufacturer’s recom-
mended burner orifice pressure for the size
orifice(s) used. Assure the main burner primary
air supply is properly adjusted for complete
combustion (refer to the appliance
manufacturer’s instructions).
2. IF CHECKING GAS INPUT BY CLOCKING
THE GAS METER:
• Assure that the only gas flow through the
meter is that of the appliance being tested.
• Assure 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 70-2602)
and compare to the Btuh input rating on the
appliance nameplate.
3. IF CHECKING GAS INPUT WITH A MA-
NOMETER (PRESSURE GAUGE):
• Assure 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 the outlet 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.
3/8 TO 1/2 INCH
10 TO 13 mm
PROPER FLAME
ADJUSTMENT
THERMOCOUPLE
M3086
Fig. 9—Proper flame adjustment.
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