Wiring - Ingersoll-Rand VHP40RMD Operation & Maintenance Manual

Operation & Maintenance Manual Installation

Wiring

Both the VHP40RMD and VHP40RMG are electrically self-contained, and no interface wiring
to a vehicle onto which it may be mounted is necessary. The exception to this occurs if the
user wished to connect the compressor to the 12VDC battery of the vehicle. If this is done, the
compressor battery, battery cables, and battery heat shield should be removed. Depending on
their length, larger gage battery cables than supplied with the compressor will probably be
required. The new cables should be terminated at the same locations as the supplied cables.
Care must be taken to provide sufficient strain relief in the external cables and to ensure that
they do not chafe on any sharpe edges.
The compressor is protected against overheating by a thermal-type discharge air temperature
switch located in the compressor discharge manifold. A "normally-open" type thermal switch,
factory set at 482°F (250°C), is supplied as standard equipment on these units. Similarly, the
engine is protected against overheating with a thermal switch situated in the thermostat
housing, sensing engine coolant temperature as it is discharged to the radiator.
The safety shutdown function of the unit is completely internal to the module, and operates by
de-energizing the fuel solenoid on the gasoline engine and de-energizing a solenoid that holds
the fuel control on the fuel injection pump open on the diesel powered unit.
28 23221138 (12-07) Rev A