VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: kb.vmacair.com
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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, as well as the inside of the housing,
resulting in performance losses and reduced system life.
The system is equipped with a replaceable paper element inlet air 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 required to maintain
system performance and extend the system’s life.
Compressor Drive, Belt and Tensioning
The compressor is directly driven by a 4 rib belt. Anytime the engine is running
the compressor is running. The system has an automatic belt tensioner, manual
adjustment is not required.
Pressure Regulation
Pressure regulation is achieved with a combination of an inlet valve regulator, a
mechanical unloader valve and a discharge valve. Use a Filter Regulator Lubricator
(FRL) to regulate downstream pressure to the tools.
System Pressure Unload
Internal system pressure is controlled via a mechanical unloader valve. When
downstream air pressure reaches 140 psi (air pressure to the 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 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 which reduces the load on the engine. This allows
the control system to reduce engine speed which improves fuel efficiency, as
well as reducing emissions and wear and tear on the system. When downstream
pressure drops below 120 psi, the unloader valve will close and “load” the system,
allowing it to build air.
Engine Speed Control
The engine speed is controlled mechanically by a pneumatic throttle which raises
and lowers engine rpm according to air demand. Operator input is not required on
the throttle lever.
Spark Arrester
The gas engine is supplied with a spark arrester.
For more information regarding the spark arrester, refer to the Honda GX390
Owner’s Manual supplied with the system (VMAC P/N: 1901066).
