Gentherm 5220 Operating Manual page 20

28142 Rev 15
Spark Ignition Control System
The SI system consists of the following parts:
• Spark electrode
Pressure switch
•
Spark Ignition module (SI)
•
Solenoid Valve
•
• SI Power Supply Board (FPCi Board)
Battery pack
•
When the manual ball valve is opened, fuel pressure causes the pressure switch (located in
the fuel system) to close. This, combined with the absence of flame sensed with the spark
electrode, signals the SI module to produce a spark in the burner. At this point, the SI module
opens the solenoid valve, allowing gas to flow into the burner. Once a flame is detected, the
SI will stop sparking and the SI will continue to monitor the presence of flame at the
electrode. If the SI does not detect combustion after 7 seconds, it will stop sparking and
close the solenoid valve. It will wait a 10 second purge period, and then make another
attempt at ignition. The SI will attempt 3 ignition trials, and if combustion cannot be
maintained, the SI will go into standby mode and the power supply board (FPCi) will go into
sleep mode. The power supply will have to be reset for another attempt at ignition.
Resetting the Power Supply
To reset the power supply, the closed signal from the pressure switch must be reset. The
simplest method is to pull one of the orange wire spade connectors off the pressure sensor,
wait 10 seconds and replace it. The power supply will energize the SI, and the SI will begin
another three start trials.
The combustion control system contains 3 D-sized 2-volt, 2.5 amp-hour
rechargeable batteries and a constant-potential battery charger. A new fully
charged battery provides approximately 240 minutes of operating time at
NOTE:
25ºC. The power supply switches from battery voltage to generator power
unit voltage in less than 15 minutes after startup. Completely discharged
batteries will take approximately 14 days' TEG operation to regain 100%
charge.
Gentherm Global Power Technologies
PROCESS DESCRIPTION
Page 14