VR8304 INTERMITTENT PILOT COMBINATION GAS CONTROL
Perform Gas Leak Test
WARNING
Fire or explosion hazard. Can cause property damage, severe injury, or death.
Check for gas leaks with a 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 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 the 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 the gas control inlet and outlet with a rich soap and water solution.
5.If another gas leak is detected, tighten adapter screws, joints, and pipe connections.
6.Replace the part if the gas leak cannot be stopped.
Adjust the Pilot Burner Flame
The pilot flame should envelop 3/8 to 1/2 in.
1.Remove the pilot adjustment cover screw. Refer to Fig. 4.
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 ensure proper operation.
PROPER FLAME
ADJUSTMENT
3/8 TO 1/2 INCH (10 TO 13 mm)
IGNITER-
SENSOR
M3080A
and compare to the Btuh input rating on the appliance nameplate.
3.IF CHECKING GAS INPUT WITH A MANOMETER (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 replacing 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.
•Perform the gas leak test at the inlet pressure tap plug.
Standard-opening and slow-opening pressure regulator
1.The gas control outlet pressure should match the manifold pressure listed on the appliance name- plate.
2.With the main burner operating, check the gas con- trol flow rate using the meter docking method or check the gas pressure using a manometer con- nected 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 ranges.
a.Remove the pressure regulator adjustment cap and screw.
b.b.Using a screwdriver, turn the inner adjustment
screw clockwise 
to increase, or counter-
clockwise 
to decrease, the main burner gas pressure.
c.Always replace the cap screw and tighten firmly to ensure 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 using a manometer at the inlet pressure tap. If the inlet pressure is in the nor- mal range (refer to Table 6 or 7), replace the gas con- trol. Otherwise take the necessary steps to provide proper gas pressure to the gas control.
Fig. 9. 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 manufacturer’s recommended burner orifice pressure for the size of orifice(s) used. Ensure 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:
•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
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 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 5 or 6 for factory- set nominal outlet pressures and adjustment ranges.
a.Remove pressure regulator adjustment cap screw.
b.Using a screwdriver, turn the inner adjustment
screw clockwise 
to increase or counter-
clockwise 
to decrease the main burner gas pressure.
c.Always replace the cap screw and tighten firmly to ensure proper operation.
4.If the desired outlet pressure or flow rate cannot be achieved by adjusting the gas control, check the inlet pressure 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 6 or 7), replace the existing gas control. Otherwise, take the necessary steps to provide proper gas pressure to the gas control.
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