Honeywell VS8510 Manual page 9

STANDING PILOT MILLIVOLT VALVE
PILOT-POSITION (SAFETY/MANUAL VALVE OPEN)
ON
OFF
SUPPLY ORIFICE
PILOTSTAT
INTLET
SAFETY VALVE
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.
SERVO
VALVE
KNOB
POWER
UNIT
Fig. 10. Safety valve is open and pilot is lit.
VS8510/VS8520 MILLIVOLT COMBINATION GAS CONTROL
VENT
MILLIVOLT
OPERATOR
MAIN VALVE
PILOT TUBE
INLET GAS
OUTLET GAS
WORKING GAS
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.
9
SERVO
REGULATOR
Q313
THERMOPILE
ELECTRODE
MAIN BURNER
OUTLET
Q377 PILOT
BURNER
CONNECT
THERMOPILE
LEADWIRES TO
GAS CONTROL
CONNECT ELECTRODE
LEADWIRE TO PIEZO
IGNITER
M15094
68-0203