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Global Power Technologies 20
S-8500
5. Loosen or remove the wire connectors from the pressure switch and then short circuit the
two wires. Sparking should occur in the combustion chamber (making a clicking noise).
5.3.2 Check the Operation of the Ignition Control Module and Spark Generation
1. Verify that the ceramic rod protrudes the correct distance, see 5.3.1.
2. Start the TEG.
3. If sparking occurs, the ignition control module is functioning.
4. If no sparking occurs, verify on the SI Controller board that the SI Power indicator light is
turn on, (see Appendix G, Table 4). If it is on, check that the two boards are connected
together with good contact, otherwise replace the SI module.
5.3.3 Check the spark return path for the SI module
1. Verify the Green wire in the Ignition cable assembly is connected to the Spark post
assembly.
2. Verify that the Green wire in the Ignition cable assembly is connected to the SI module
SPARK RETURN (See Appendix G, Figure 22).
3. Both connections are required for the SI module to properly detect flame recognition. See
wiring diagrams Appendix D, Figures 12 and 13 for reference.
5.3.4 Pressure Switch
Follow these steps to check the pressure switch:
1. Remove the two wires from the pressure switch and connect a multi-meter across the
pressure switch terminals, set to measure resistance (ohms).
2. If there is no fuel pressure in the system, check the resistance measured across the
switch is near infinity, which indicates the switch is open.
3. Provide fuel pressure to the switch by opening the manual shut-off valve.
4. Check that the resistance measured across the switch is near zero, which indicates the
switch is closed. Replace the pressure switch if necessary.
Note: Switch should close at pressures above 13.8 kPa (2 psi).
5. Remove fuel pressure from the switch by closing the manual shut-off valve and use a
wire to join the two removed pressure switch wires together. This will cause the system
to attempt a start which will release the trapped fuel.
6. If the TEG Controller (Remote Start) option has been installed, refer to Appendix I -
Option for starting instructions to release the trapped fuel.
7. Check the resistance measured across the switch is near infinity, which indicates the
switch is opened. Replace the pressure switch if necessary.
Note: Switch should open at pressures below 6.9 kPa (1 psi).
8. The SI controller must recognize that there is fuel available by the closed pressure switch
condition before it will power the SI module.
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