VS8510/VS8520 MILLIVOLT COMBINATION GAS CONTROL
68-0203
11
Checkout
WARNING
Fire or explosion hazard.
Can cause severe injury or death and property
damage.
1.
Do not force the gas control knob on the
appliance. Use only your hand to turn the gas
control knob. Never use any tools.
2.
If the knob does not operate by hand, the control
should be replaced by a qualified service
technician.
Gas Control Knob Settings
Gas control knob settings are as follows:
OFF: Prevents main gas flow through the control.
ON: Permits main burner and pilot gas flow. Gas control
and thermostat control main burner gas flow.
PILOT: Opens pilot valve and allows gas flow to pilot
burner.
HI/LO: Manually adjusts outlet pressure.
NOTE:
Controls are shipped with the gas control knob in the
ON position.
Perform Gas Leak Test
WARNING
Fire or explosion hazard.
Can cause severe injury or death and property
damage.
1.
Stand away from the main burner while lighting.
Hidden gas leaks can cause flashbacks in the
appliance vestibule.
2.
Check for gas leaks with rich soap and water
solution any time work is done on a gas system.
Gas Leak Test
1. Paint the pipe connections upstream of the gas control
with rich soap and water solution. Bubbles indicate a
gas leak.
2. If a leak is detected, tighten the pipe connections.
3. Light the main burner.
4. With the main burner in operation, paint the pipe joints
(including adapters) and control inlet and outlet with a
rich soap and water solution.
5. If another leak is detected, tighten the adapter screws,
joints, and pipe connections.
6. Replace part if leak cannot be stopped.
Turn on System
Rotate the gas control knob counterclockwise to ON.
T
urn on Main Burner
Follow the instructions provided by the appliance
manufacturer or turn up the thermostat to call for heat.
Check and Adjust Gas Input and Burner Ignition
CAUTION
1.
Do not exceed the input rating stamped on the
appliance nameplate, or manufacturer
recommended burner orifice pressure for size
orifice(s) used. Be sure primary air supply to the
main burner is properly adjusted for complete
combustion. Follow the instructions of the
appliance manufacturer.
2.
IF CHECKING GAS INPUT BY CLOCKING GAS
METER: Be sure there is no gas flow through the
meter other than to the appliance being checked.
Other appliances must remain off with the pilots
extinguished (or the consumption 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 nameplate.
3.
IF CHECKING GAS INPUT WITH MANOMETER:
Both the inlet and outlet pressure taps have a
captive screw. To measure the pressure of the
tap, loosen, but do not remove the captive screw,
attach a plastic tube with a 1/4 in. shell I.D. and
connect the manometer. After checking the
pressure, turn the gas control knob to the OFF
position. Before opening the outlet pressure tap,
be sure the gas control is in the OFF position.
Before opening the inlet pressure tap, shut off the
gas supply at the manual valve in the gas piping
to the appliance or, for LP, at the tank. Repeat the
Gas Leak Test at the pressure tap with the main
burner operating.
Check Safety Shutdown Performance
WARNING
Fire or explosion hazard.
Can cause severe injury or death and property
damage.
Perform the safety shutdown test any time work is
done on a gas system.
1. Place gas control knob in PILOT position. Main burner
should go off and pilot should remain lit.
2. Extinguish pilot flame. The VS8510 pilot gas flow should
stop within three minutes; the VS8520 pilot gas flow
stops within thirty seconds. Safety shutoff of pilot gas
proves complete shutdown because safety shutoff valve
prohibits main burner and pilot gas flow.
3. Relight pilot burner and operate the system through
one complete cycle to ensure all controls operate
properly.
MAINTENANCE
WARNING
Fire or explosion hazard.
Can cause severe injury or death and property
damage.
Do not attempt to take apart the gas control or to
clean it. Improper assembly and cleaning can cause
unreliable operation.
Regular preventive maintenance is important in applications
that place a heavy load on system controls such as those
used in the commercial cooking and agricultural and industrial
industries because:
•
In many such applications, particularly commercial
cooking, the equipment operates 100,000 to 200,000
cycles per year. Such heavy cycling can wear out the gas
control in one to two years.