VMAC – Vehicle Mounted Air Compressors
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1.0 General Information
Read this manual before beginning the installation so that you can
understand the hydraulic, electric (Figure 2) and ventilation
requirements. This will ensure a successful installation and effective
operation of the PREDATAIR60 (Figure 1).
1.1 Specifications and Components
This is a flooded-lobe, rotary screw compressor (filled with VMAC
certified and approved synthetic oil) driven by a hydraulic motor.
Compression occurs when inlet air (at normal atmospheric pressure)
enters a chamber where it is trapped between the rotating rotor
lobes. A lubricated pitch line provides sealing. As the lobes mesh,
they reduce the volume of the air, compressing it to the desired
pressure.
The system has a two-stage air/oil separator. The first separation
stage consists of baffles, which perform mechanical separation. The
second stage uses a special separation element, which delivers dry
air to the outlet.
Pressure regulation is achieved with a mechanical inlet control valve
and an adjustable pressure regulator.
The compressor is protected by a paper-type replaceable air filter
and a spin-on type oil filter. Oil is removed from the delivered service
air by a coalescing separator element.
Safety features include:
• 2,650 psi hydraulic pressure relief valve
• 200 PSI relief valve in oil/air tank
• blow-down valve to discharge system pressure on shutdown
• temperature safety sensor in compressor
Do not disable or bypass the over-temperature
shutdown circuit. Failure of the shutdown system could
result in equipment damage, injury or death.
A liquid-to-air cooler maintains operating temperatures in an optimal
performance range which increases system durability and reduces
the temperature of the compressed air.
The system pressure is pre-set at 150 psi. Do not increase this
pressure setting as it will also increase the hydraulic operating
pressure. To reduce the pressure, use a Filter Regulator Lubricator
(FRL).
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