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ADJUST THE PILOT BURNER FLAME
The pilot flame should envelop 3/8 to 1/2 in. [10 to 13 mm]
of the igniter-sensor tip. Refer to Fig. 8. To adjust the pilot
flame:
1. Remove the pilot adjustment cover screw. Refer to
Fig. 4.
2. Turn the inner adjustment screw clockwise
decrease or counterclockwise
flame.
3. To prevent gas leakage always replace the cover
screw after adjustment.
Fig. 8—Proper flame adjustment.
3/8 TO 1/2 INCH
[10 TO 13 mm]
IGNITER-
SENSOR
M3080A
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
the meter is that of the appliance being
checked.
• Make certain that other appliances are
turned off with pilot burners extinguished
(or deduct that gas consumption from the
meter reading).
• Convert the flow rate to Btuh as described
in form 70-2602, Gas Controls Handbook,
and compare to the Btuh input rating on the
appliance nameplate.
3. IF CHECKING GAS INPUT WITH A MA-
NOMETER (PRESSURE GAUGE):
• To connect the manometer, be sure the gas
control knob is in the PILOT position be-
fore removing the outlet pressure tap plug.
• When removing the manometer, turn the
gas control knob back to PILOT and re-
place the outlet pressure tap plug.
• Shut off the gas supply at the appliance
service valve, or at the gas tank for LP gas,
before removing the outlet pressure tap
plug and before disconnecting the manom-
eter and replacing the outlet pressure tap
plug.
• Perform the Gas Leak Test at the outlet
pressure tap plug.
69-0695—2
to
to increase the pilot
PROPER FLAME
ADJUSTMENT
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.
4. If the desired outlet gas pressure or gas flow rate can
not be achieved by adjusting the gas control, check the gas
control inlet pressure by using a manometer at the inlet
pressure tap. If the inlet pressure is in the normal range
(refer to Table 5 or 6), 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 con-
trol flow rate by using the meter clocking method or check
the gas pressure by 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 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 decrease the main burner gas pressure.
c. Always replace the cap screw and tighten firmly to
safeguard proper operation.
4. If desired outlet pressure or flow rate can not be
achieved by adjusting the gas control, check the inlet pres-
sure by 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 5 or 6), 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
pressure. Make sure the main burner lights smoothly and
without flashback to the orifice and that all ports remain
lit. Cycle the main burner several times, allowing at least
30 seconds between 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 im-
prove lightoff characteristics.
CHECK SAFETY SHUTDOWN PERFORMANCE
WARNING
!
FIRE OR EXPLOSION HAZARD
CAN CAUSE PROPERTY DAMAGE,
SEVERE INJURY, OR DEATH
Perform the safety shutdown test anytime work is
done on a gas system.
6
to increase or counterclockwise
to increase or counterclockwise
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