Global Power Technologies
SERVICE AND MAINTENANCE
05585 rev11 | Model 8550-SD
Page 32 of 53
The TEG may be jump-started to charge a depleted battery. To do this:
1.
Remove the thin white/red and white/black wires from terminals 2 and 4 on TB-1 and apply a 12-
to 30-Volt power source across these wires.
2.
Start the TEG normally.
3.
Reconnect the removed wires once the Fuel Shutoff Valve no longer requires the button to be
manually held.
5.7
OVERTEMPERATURE SHUTDOWN SYSTEM
The purpose of the safety shutdown system is to shut off the fuel supply in the event of a Power Unit
or cabinet overtemperature. Overtemperature conditions can occur if air flow across the heat pipes is
restricted, ambient temperatures exceed maximum ratings, or from heat pipe failure.
The Overtemperature Shutdown system consists of the following main components:
Six Shutdown Thermostats – Each thermostat is installed in a heat pipe block and protects two
heat pipes. During an overtemperature event, the thermostat will cause the respective shutdown
fuse to blow in the Shutdown Module.
NOTE: Thermostats produced after September 2021 will come paired with an Adaptor
Board that must be installed for proper operation.
Shutdown Module – This module houses the thermostat fuses and is powered directly from the
power unit. If all six fuses are intact, and the power unit voltage is above 12.5 Volts, this Module
will provide 12 Volts to energize the Shutdown Relay.
Shutdown Relay Assembly – This assembly is situated between the burner thermocouple and the
shut-off valve. When energized, it allows the thermocouple signal to pass through. If an
overtemperature event occurs it will de-energize and interrupt the signal, thereby shutting off
the fuel valve.
Thermal Cut-off – This is a thermal fuse that is placed in line with the Shutdown Relay red power
wire. While the six thermostats protect the heat pipes and power unit, the thermal cut-off
protects the cabinet interior from overtemperature. If the cabinet gets too hot, this fuse will
open and cause the shutdown relay to de-energize.
If an unexpected shutdown occurs, check the thermal cut-off and six shutdown fuses for continuity. If
any of them have opened, then follow these maintenance steps:
1.
Inspect all the heat pipes for damage and clean any debris.
2.
Inspect the thermostat wiring for loose or broken wires.
If the thermostat is paired with an adaptor board, ensure that both quick-connect terminals
are tight.
If the thermal cut-off opened, check the fuel system for leaks and ensure that the burner
thermocouple fitting is tight.
If no obvious problems are observed, replace the blown shutdown fuses and/or thermal cut-
off.