TM 9-2320-272-101-19.ELECTRICAL SYSTEMS OPERATION (Contd)f.Heating System Operation.The electrical portion of the heating system is identical for all models covered in the manual and consists ofthe following major components and circuitry:GPROTECTIVE CONTROL BOX- Provides 24-volt power to circuit breaker through circuits 5 and 5a and tothe heater switch through circuits 27 and 5c.HCIRCUIT BREAKER- Provides overload protection for 24-volt circuits 5, 5a, 27, and 5c leading to the heaterswitch.IBATTERY SWITCH- Provides 12-volt battery power from circuit 569 through 569A to the heater.JCIRCUIT BREAKER- Provides overload protection for 12-volt circuit 569A leading to heater switch.KHEATER SWITCH- Controls low and high blower motor speed and has two sources of power; 12-volt poweris supplied through circuit 569A from the battery switch and is used to provide low speed; 24-volt power issupplied through circuit 5C from the protective control box and is used to provide high speed.LHEATER BLOWER MOTOR- A direct current motor controlled by the heater switch through circuit 400.1-53
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