VR8300 CONTINUOUS PILOT COMBINATION GAS CONTROL
7
69-0668—05
CAUTION
1. Do not exceed the input rating stamped on the
appliance nameplate, or the manufacturer
recommended burner orifice pressure for the size
orifice(s) used. Make sure the main burner
primary air supply is properly adjusted for
complete combustion Follow the instructions of
the appliance manufacturer.
2. IF CHECKING GAS INPUT BY CLOCKINGTHE
GAS METER:
•Be sure there is no gas flow through the meter
other than that of the appliance being tested.
•Other appliances must remain off with pilots
extinguished (or the consumptions must be
deducted 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 name plate.
3. IF 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 replacing 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 clocking method or
check the gas pressure using a manometer con-
nected to the gas control outlet pressure tap. See
3.
If necessary, adjust the pressure regulator to
match the appliance rating. Refer to Table 7or 8 for
the factory-set nominal outlet pressures and
adjustment ranges.
a. Remove the pressure regulator adjustment cap
and screw.
b. Use a screwdriver to 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
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 7 or
8), replace the gas control. Otherwise, take the nec-
essary steps to provide proper gas pressure to the
gas control.
Table 8. Pressure Regulator Specification Pressures in in. wc.
Table 9. Pressure Regulator Specification Pressures in Kpa.
CHECK SAFETY SHUTDOWN
PERFORMANCE
WARNING
Fire or Explosion Hazard.
Can cause property damage, severe injury, or
death
Perform the safety shutdown test any time work
is done on a gas system.
1.
Place the gas control knob in the PILOT position.
Main burner should go off and pilot should remain
lit.
2.
Extinguish the pilot flame. Pilot gas flow should
stop within 2-1/2 minutes. Safety shutoff of pilot
gas proves complete shutdown since safety shut-
off valve prevents main burner and pilot gas flow.
3.
Relight pilot burner and operate system through
one complete cycle to ensure all controls operate
properly.
Model
Type of Gas
Nominal Inlet Pressure
Range
Outlet Pressure
Nominal Factory Setting
Setting Range
Step
Full Range
Step
Full Rate
Standard-
opening
Natural
5.0 - 7.0
—
3.5
—
3.0 - 5.0
Lp
12.0 - 14.0
—
11.0
—
8.0 - 12.0
Model
Type of Gas
Nominal Inlet Pressure
Range
Outlet Pressure
Nominal Factory Setting
Setting Range
Step
Full Range
Step
Full Rate
Standard-
opening
Natural
1.2 - 1.7
—
0.9
—
0.7 - 1.2
Lp
2.9 - 3.9
—
2.7
—
2.0 - 3.0
