VR8215S,T SINGLE STAGE VR8215Q,N TWO STAGE DIRECT IGNITION GAS CONTROLS
7
69-2253—07
Regular preventive maintenance is important in
applications in the commercial cooking and
agricultural and industrial industries that place a
heavy load on system controls 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.
• Exposure to water, dirt, chemicals and heat can
damage the gas control and shut down the control
system.
The maintenance program should include regular
checkout of the control as outlined in the Startup and
Checkout section, and the control system as described
in the appliance manufacturer literature.
Maintenance frequency must be determined
individually for each application. Some considerations
are:
• Cycling frequency. Appliances that may cycle
20,000 times annually should be checked monthly.
• Intermittent use. Appliances that are used
seasonally should be checked before shutdown and
again before the next use.
• Consequence of unexpected shutdown. Where the
cost of an unexpected shutdown would be high, the
system should be checked more often.
• Dusty, wet, or corrosive environments. Since these
environments can cause the gas control to
deteriorate more rapidly, the system should be
checked more often.
The system should be replaced if:
• It does not perform properly on checkout or
troubleshooting.
• The gas control is likely to have operated for more
than 200,000 cycles.
• The control is wet or looks as if it has been wet.
SERVICE
WARNING
Fire or Explosion Hazard.
Can cause property damage, severe injury
or death.
Do not disassemble the gas control; it contains
no replaceable components. Attempted
disassembly, repair, or cleaning can damage
the control, resulting in gas leakage.
CAUTION
Equipment Damage Hazard.
Can burn out thermostats or other
components in the control string.
Never apply a jumper across (or short) the
valve coil terminals, even temporarily.
After servicing, verify proper system operation.
If Main Burner Does Not
Come On With Call For Heat
1.
Confirm the gas control switch is in the ON
position.
2.
Adjust thermostat several degrees above room
temperature.
3.
Using ac voltmeter, measure across the quick
connect terminals at gas control.
4.
If voltage is incorrect or not present, check
control circuit for proper operation.
5.
If proper voltage is present, replace gas control.