7 69-0624—2
LIGHT MAIN BURNER
Follow the appliance manufacturer instructions or set the
thermostat setting above room temperature to call for heat.
Fig. 10—Proper flame adjustment.
CHECK AND ADJUST GAS INPUT TO MAIN
BURNER
CAUTION
1. Do not exceed the input rating stamped on the
appliance nameplate, or the manufacturers rec-
ommended burner orifice pressure for the size
orifice(s) used. Make sure the main burner pri-
mary air supply is properly adjusted for complete
combustion (refer to the appliance manufactur-
ers instructions).
2. WHEN CHECKING GAS INPUT BY
CLOCKING THE GAS METER:
• Make sure that the only gas flow through the
meter is that of the appliance being checked.
• Make sure that other appliances are turned
off and that the pilot burners are extinguished
(or deduct the 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. WHEN CHECKING GAS INPUT WITH A
MANOMETER (PRESSURE GAUGE):
• Make sure 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 the 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.
Standard-Opening and Slow-Opening Pressure
Regulator
1. The gas control outlet pressure should match the mani-
fold pressure listed on the appliance nameplate.
2. With the main burner operating, check the gas control
flow rate 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 8 or 9 for the factory set
nominal outlet pressures and adjustment ranges.
a. Remove the pressure regulator adjustment cap screw.
b. Using a screwdriver, turn the inner adjustment screw
clockwise to increase or counterclockwise.
to decrease the main burner gas pressure.
c. Always replace the cap screw and tighten firmly to be
sure of proper operation.
4. If the desired outlet gas pressure or gas flow rate
cannot be achieved by adjusting the gas control, check the
gas control inlet pressure using a manometer at the inlet
pressure tap. If the inlet pressure is in the normal range (refer
to Table 8 or 9), replace the gas control. Otherwise, take the
necessary steps to provide proper gas pressure to the gas
control.
Step-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 control
flow rate 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 8 or 9 for factory set
nominal outlet pressures and adjustment ranges.
a. Remove the pressure regulator adjustment cap screw.
b. Using a screwdriver, turn the inner adjustment screw
clockwise to increase or counterclockwise
to decrease the main burner gas pressure.
c. Always replace the cap screw and tighten firmly to
safeguard proper operation.
4. 1f desired outlet pressure or flow rate cannot be
achieved by adjusting the gas control, check the inlet pres-
sure using a manometer at inlet pressure tap or upstream of
the gas control. If the inlet pressure is in the normal range
(refer to Table 8 or 9), replace the existing gas control.
Otherwise, take the necessary steps to provide proper gas
pressure to the gas control.
5. Carefully check main burner lightoff at the step pres-
sure. Be sure the main burner lights smoothly and without
flash back to the orifice and that all ports remain lit. Cycle the
main burner several times, allowing at least 30 seconds be-
tween cycles for the regulator to resume the step function.
Repeat after allowing main burner to cool. Readjust the full
rate outlet pressure, if necessary, to improve lightoff
characteristics.
M3086A
PROPER FLAME
ADJUSTMENT
3/8 TO 1/2 INCH
[10 TO 13 MILLIMETERS]
THERMOCOUPLE
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