Vmac RAPTAIR-G30, Service Manual

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VMAC
– Vehicle Mounted Air Compressors
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Filtration
VMAC rotary screw compressors are designed and machined to
exacting tolerances. Foreign particles entering the compressor can
damage system components such as seals, bearings, rotors, and the
inside of the housing resulting in efficiency and performance losses and
reduced system life expectancy.
The system is equipped with a replaceable paper element air inlet filter,
spin-on high pressure oil filter and a spin-on coalescing filter.
These system filters enhance performance and extend component life
by reducing damage from dust and other debris. Proper maintenance is
the key to long compressor system life.
Compressor Drive, Belt and Tensioning
The compressor is directly driven by a six rib belt, anytime the engine is
running the compressor is running. The system has an automatic belt
tensioner (no adjustment is required).
Pressure Regulation
Pressure regulation is achieved with a mechanical unloader valve and
discharge valve. Use a Filter Regulator Lubricator (FRL) to set the final
tool pressure.
System Pressure Unload
Internal system pressure is controlled with a mechanical unloader valve.
When downstream air pressure reaches 150psi (air pressure seen at air
tools), the mechanical unloader valve activates and sends a signal to the
mechanical discharge valve to open. When open, the mechanical
discharge valve sends internal system pressure (pressure seen inside
the compressor and WHASP tank) to the inlet valve and closes the
compressor air intake poppet. Internal air pressure is then vented to a
nominal value.
Engine Speed Control
The engine speed is controlled mechanically by a pneumatic throttle,
which raises and lowers engine rpm according to air demand. No
operator input is required on the throttle lever.
Spark Arrester
The gas drive is equipped from the factory with a spark arrester.
For more information regarding the spark arrester refer to the
“Subaru
Engine Manual" supplied with the system (VMAC part number:
1901022).