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Startup 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 turn the gas control knob. Never
use any tools.
2. If the gas control knob will not operate by
hand, call a qualified service technician to re-
place the gas control.
GAS CONTROL KNOB SETTINGS
The gas control knob settings are as follows:
OFF: Prevents gas flow to main burner.
ON: Permits main burner gas flow. Under control of the
thermostat and direct ignition module, gas can flow
to the main burner.
NOTE: Gas controls are shipped with the gas control knob
in the ON position.
TURN ON SYSTEM
Rotate the gas control knob counterclockwise
ON.
TURN ON MAIN BURNER
Follow instructions provided by appliance manufac-
turer or turn up thermostat to call for heat.
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 anytime work is done on a gas control.
GAS LEAK TEST
1. Paint all pipe connections upstream of the gas con-
trol 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 flanges) and gas control inlet and outlet
with rich soap and water solution.
5. If another gas leak is detected, tighten flange screws,
joints, and pipe connections.
6. Replace the part if gas leak can not be stopped.
CHECK AND ADJUST GAS INPUT TO MAIN
BURNER
CAUTION
1. Do not exceed the input rating stamped on the
appliance nameplate, or manufacturer recom-
mended burner orifice pressure for the size
orifice(s) used. Make certain the primary air
supply to the main burner is properly adjusted
for complete combustion (refer to the appli-
ance manufacturer instructions).
2. IF CHECKING GAS INPUT BY CLOCK-
ING THE GAS METER:
• Make sure that the only gas flow through
• Make certain that other appliances are turned
• Convert the flow rate to Btuh as described
3. IF CHECKING GAS INPUT WITH A MA-
NOMETER (PRESSURE GAUGE):
to
• To connect the manometer, be sure the gas
• When removing the manometer, turn the
• Shut off the gas supply at the appliance
• Perform the Gas Leak Test at the outlet
Standard-Opening and Slow-Opening Pressure
Regulator
1. The gas control outlet pressure should match the
manifold pressure listed on the appliance nameplate.
2. With the main burner operating, check the gas con-
trol flow rate by using the meter clocking method or check
the gas pressure using a manometer connected to the gas
control outlet pressure tap. Refer to Fig. 4.
3. If necessary, adjust the pressure regulator to match
the appliance rating. Refer to Table 5 or 6 for the factory set
nominal outlet pressures and adjustment setting ranges.
a. Remove the pressure regulator adjustment cap screw.
b. Using a screwdriver, turn the inner adjustment screw
clockwise
to decrease the main burner gas pressure.
c. Always replace the cap screw and tighten firmly to
safeguard proper operation.
5
the meter is that of the appliance being
checked.
off with pilot burners extinguished (or de-
duct that gas consumption from the meter
reading).
in form 70-2602, Gas Controls Handbook,
and compare to the Btuh input rating on the
appliance nameplate.
control knob is in the OFF position before
removing the outlet pressure tap plug.
gas control knob back to OFF and replace
the outlet pressure tap plug.
service valve, or at the gas tank for LP gas,
before removing the outlet pressure tap plug
and before disconnecting the manometer
and replacing the outlet pressure tap plug.
pressure tap plug.
to increase or counterclockwise
69-0696—1
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