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SV9401/SV9402/SV9403, SV9501/SV9502/SV9503, SV9601/SV9602 SMARTVALVE™
MAINTENANCE
WARNING
Fire or Explosion Hazard.
Can cause property damage, severe injury,
or death.
Do not attempt to take the control apart or clean it.
Improper cleaning or reassembly can cause gas
leakage.
Regular preventive maintenance is important in applica-
tions such as 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 check-
out 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 environment. Because 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 trouble-
shooting.
• 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
CAUTION
Equipment Damage.
Can cause property damage.
Do not disassemble the ignition system control; it
contains no replaceable components. Attempted
disassembly or repair can damage the ignition
system control.
69-1004—2
CAUTION
Electrical Equipment Damage Hazard.
Do not apply a jumper across or short the thermo-
stat, 24V hot or 24V common terminal in the
SV9401/SV9402/SV9403, SV9501/SV9502/
SV9503, or SV9601/SV9602 wiring harness. This
can burn out the heat anticipator in the thermostat
or damage the system transformer.
Carefully read the Sequence of Operation and Trouble-
shooting information before attempting to service the
appliance. After servicing, make sure the system operates
properly.
IMPORTANT
Allow 60 seconds after shutdown before re-
energizing a step-opening model to assure
lightoff at step pressure.
SEQUENCE OF OPERATION
Fig. 13 shows the sequence of operation for this family of
gas controls. When reviewing sequence of operation:
• Make sure the appliance is powered with the gas
supply turned on.
• Make sure the ignition system control switch is in the
ON position.
TROUBLESHOOTING
If Main Burner Will Not Come On With Call
for Heat
1. Make sure the appliance has power and the gas
supply is turned on.
2. Make sure the ignition system control switch is in the
ON position.
3. Adjust the thermostat several degrees above room
temperature.
4. If the appliance does not light, check for proper
ignition control system operation. Use Fig. 13.
5. If it appears the ignition control system is not
working properly, use Fig. 14 as a troubleshooting
guide.
IMPORTANT
1. Proper troubleshooting requires measurement of
voltage and resistance with a volt/ohm meter.
2. Use proper size probes and appropriate testing
techniques to get good test information without
damaging the control terminals, connectors, or
wiring harness.
Use the following basic troubleshooting procedure:
1. Review this information carefully before going to the
job site.
2. Identify the specific ignition control model on the
appliance.
3. Make sure the Q3450/Q3480 HSI element is good.
4. Make sure the ignition control switch (knob if
SV9500) is in the ON position unless directed
otherwise in the Troubleshooting flow chart.
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