VS8510/VS8520 MILLIVOLT COMBINATION GAS CONTROL
68-0203
9
Fig. 10. Safety valve is open and pilot is lit.
HI/LO Regulator
As you turn the HI/LO knob, the gas pressure changes.
1. Turn the knob clockwise toward the HI setting to
increase gas pressure.
2. Turn the knob counterclockwise toward the LO setting
to decrease gas pressure.
Minimum and maximum regulator settings vary for each
individual gas valve. See gas valve label for actual minimum
and maximum ranges. Table 3 lists possible minimums and
maximums for gas valves.
Standard Pressure Regulator
1. Check the manifold pressure listed on the appliance
nameplate. Gas control outlet pressure should match
the nameplate.
2. With the main burner operating, check the gas control
flow rate using the meter clocking method or measure
the pressure by attaching a plastic tube with a 1/4 in.
shell I.D. to the manometer and connecting the
manometer to the outlet pressure tap on the gas
control. See Fig. 5.
M15094
POWER
UNIT
PILOTSTAT
KNOB
SUPPLY ORIFICE
SERVO
VALVE
MAIN VALVE
SERVO
REGULATOR
MILLIVOLT
OPERATOR
OFF
ON
PILO
T
VENT
INTLET
SAFETY VALVE
PILOT TUBE
Q313
THERMOPILE
ELECTRODE
Q377 PILOT
BURNER
CONNECT
THERMOPILE
LEADWIRES TO
GAS CONTROL
CONNECT ELECTRODE
LEADWIRE TO PIEZO
IGNITER
OUTLET
MAIN BURNER
INLET GAS
OUTLET GAS
WORKING GAS
STANDING PILOT MILLIVOLT VALVE
PILOT-POSITION (SAFETY/MANUAL VALVE OPEN)