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SV9501/SV9502/SV9602P SMARTVALVE
SV9501/SV9502/SV9601/SV9602 SmartValve® FAMILY SEQUENCE OF OPERATION
START
APPLY 24 VAC TO APPLIANCE
THERMOSTAT CALLS FOR HEAT
PREPURGE/
SYSTEM
CHECK
PREPURGE (SV9502/SV9602 ONLY)
FLAME SIGNAL DETECTED?
INTERNAL CHECK OKAY?
TRIAL
• PILOT VALVE OPENS
FOR
• IGNITER POWERED
IGNITION
PILOT LIGHTS AND FLAME IS SENSED
DURING TRIAL FOR IGNITION?
MAIN
• IGNITER OFF
BURNER
• MAIN VALVE OPENS
OPERATION
ELECTRONIC FAN TIMER (EFT) OUTPUT ENERGIZES
FLAME SIGNAL LOST?
THERMOSTAT CALL FOR HEAT ENDS
• MAIN AND PILOT VALVES CLOSE
• EFT OUTPUT DE-ENERGIZES
END
IGNITER WILL TURN OFF ABOUT 30 SECONDS INTO THE TRIAL FOR IGNITION IF THE PILOT FLAME HAS NOT LIT. IT WILL TURN BACK
1
ON FOR THE FINAL 30 SECONDS OF THE 90 SECOND TRIAL FOR IGNITION. THE PILOT VALVE WILL BE ENERGIZED DURING THE
ENTIRE TRIAL FOR IGNITION. THIS IS NORMAL OPERATION FOR THIS GAS IGNITION SYSTEM.
Fig. 14. SV9501/SV9502/SV9602 SmartValve™ Sequence of Operation.
TROUBLESHOOTING
The attached flowcharts provide specific troubleshooting
information for the SV9500, SV9501 and SV9502/
SV9600, SV9601, SV9602 products. These charts assist
the field technician to analyze appliance operation
difficulties.
CAUTION
Equipment Damage.
Can damage connectors on wiring harness.
1. Proper troubleshooting requires measurement
of voltage and resistance with a volt/ohm
meter.
2. Use proper size probes and appropriate testing
techniques to assure good test information
without damaging the control terminals,
connectors or wiring harness.
Use the following basic troubleshooting procedure.
1. Review this information carefully prior to going to
the job site.
2. Identify the specific SmartValve™ (SV9500,
SV9501, SV9502, SV9600, SV9601, SV9602).
3. Make sure the Q3450/Q3480 HSI element is good.
69-1270—2
™
SYSTEM CONTROL
YES
NO
NO
YES
NO
1
YES
YES
NO
12
• WAIT FOR FLAME SIGNAL TO DISAPPEAR.
• PILOT VALVE/IGNITER REMAIN OFF
THREE-SECOND FLAME
FAILURE RECYCLE DELAY
• PILOT VALVE CLOSES
• IGNITER OFF
• MAIN AND PILOT VALVES CLOSE
• EFT OUTPUT DE-ENERGIZES
FLAME LOST MORE THAN FIVE TIMES
IN ONE CALL FOR HEAT?
YES
4. Disconnect the HSI element from the
SmartValve™.
5. Using a multimeter, measure the HSI element
room temperature resistance. It should be less
than 10 ohms.
6. Make sure the SmartValve™ switch (knob if
SV9500/SV9600) is in the ON position (unless
directed otherwise in the Troubleshooting
flowchart).
7. Make sure the appliance call for heat function
provides proper inputs to the SmartValve™
through the 2X2 power connector. (Measure with
voltmeter on the ac scale.)
8. Follow the Operating Sequence and
Troubleshooting flow charts as shown in Fig. 13
and Fig. 15 for the installed SmartValve™ SV9500/
SV9600 to make sure replacement is necessary.
9. Follow the Operating Sequence and
Troubleshooting flow chart in Fig.14 and Fig. 16 for
the replacement SV9501/SV9502/SV9601/SV9602
SmartValve™.
NOTE: The HSI element action for SV9501/SV9502/
SV9601/SV9602 is different from the HSI
element action for SV9500/SV9600. For
SV9500/SV9600, the element is on
continuously during a call for heat until shortly
FIVE-MINUTE
RETRY DELAY
NO
M17144A
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