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4.1.2 Spark Ignition Control System
The Ignition Control System consists of the following parts:
•
Spark electrode
•
Pressure switch
•
Ignition control module (SI)
•
Solenoid valve
•
SI Power Supply
•
Battery pack
When the manual ball valve is opened, fuel pressure causes the pressure switch (locat-
ed in the fuel system) to close. This, combined with the absence of flame sensed at the
spark electrode, signals the ignition control module (SI) to generate sparks from the
electrode to the combustion chamber plate, as well as open the solenoid valve allow-
ing gas to flow into the burner chamber, causing ignition to occur. Once combustion is
detected, the SI will stop sparking and the SI will continue to monitor the presence of
flame at the electrode. If the SI did not detect combustion for a period of 7 seconds, it
will stop sparking and close the solenoid valve, wait for a 25 second purge period and
then make another attempt at ignition. The SI will attempt 3 ignition trials and if flame
detection cannot be maintained, the SI will go into standby mode and the power supply
board will go into sleep mode after 60 seconds. The power supply will have to be reset
for another attempt at ignition, see Section 4.1.2.1, Resetting the Power Supply.
4.1.2.1 Resetting the Power Supply
To reset the power supply, the closed signal from the pressure must be reset. The sim-
plest method is to pull one of the orange wire spade connectors off of the pressure sen-
sor, wait 10 seconds and replace. This is necessary because the fuel pressure switch is
closed and the pressure cannot be relieved easily. The power supply will energize the
SI and the SI will begin another three start trials. See Figure 28 and 29.
Note: The combustion control system contains 3 D-sized 2 volt, 2.5 amp-hour,
re-chargeable batteries and a constant potential battery charger. A new fully
charged battery provides approximately 240 minutes of operating time at 25ºC.
The power supply switches from battery voltage to generator power unit voltage
in less than 15 minutes after start-up. Completely discharged batteries will take
approximately 14 days TEG operation to regain 100% charge.
4.1.3 Burner
The burner receives gas from the fuel system, mixes it with air and transports the mix-
ture to the combustion zone. Air passes through an air-shutter assembly allowing for
adjustment of the air/fuel mixture. A downstream venturi provides the necessary suction
to draw in the air. This mixture leaves the venturi and passes through a burner screen
that anchors the flame. The design of the combustion chamber produces uniform heating
of the power unit hot-end.
The main parts of the burner are shown in Figure 4.
Gentherm Global Power Technologies
5220
28142 Rev. 14
4-3
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