7.2.3
Block Heater Operation
When enabled, the block heater will be powered when the APU is running. The block heater function can
be turned ON and OFF through the Aspen Interface (AI).
The engine block heater features an Arc Fault Circuit Interrupter/ Ground Fault Circuit Interrupter (AFCI/
GFCI), which provides protection to the block heater circuit against the unwanted effects of arc and
ground faults. In the event of an arc or ground fault, the AFCI/ GFCI will trip and quickly stop the flow of
electricity to mitigate arcing effects as well as to provide protection against serious injury.
The block heater AFCI/GFCI is typically located inside the cab of the truck. Refer to Section 9 for
additional information regarding the operation of the block heater AFCI/GFCI device.
If equipped, the truck engine oil or block heater connector is independent from APU “comfort
system” functions and is energized as soon as APU engine starts. The block or oil heater
must be plugged into the connector when required during cold weather operation. Unplug
the block heater connector from the block heater receptacle when not in use.
Do not extend the block heater connector cable or connect extension cords to the connector.
The block heater connector is intended for use with engine block heaters only.
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