VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: kb.vmacair.com
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This system has been adjusted at the factory for general operation.
System operation can be tested using the tools that will be operated by the
system or by using the VMAC Test Tool (A700052) with the 30 cfm (1/8 in) orifice in
the outlet to simulate tool use (Figure 23).
Ensure there are no leaks in the test tool. The system may not idle
down or unload if there are leaks in the lines or fittings.
Disconnect all downstream equipment (hose reels, etc.) and remove
the ball valve from the compressor discharge. Connect the test tool
directly to the discharge fitting on the WHASP Tank.
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Install the VMAC test tool at the system outlet with the 30 cfm (1/8 in) orifice.
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Ensure that the ball valve on the test tool is closed.
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Start the compressor system and allow the engine to run until it is at operating
temperature.
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Ensure the tension on the unloader valve is released to allow the compressor to
build to full pressure.
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Observe the pressure gauge, it should indicate approximately 140 psi (factory
setting).
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Slowly open the ball valve on the test tool and observe the operation. The
engine speed should increase when the pressure drops to 120 psi (20 psi below
system pressure).
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With the ball valve fully open, the pressure should stabilize at approximately
100 psi (this simulates a tool operating at 30 cfm).
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Close the ball valve to allow the system pressure to rise.
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Once testing is complete, follow the normal shut off procedure.
Figure 23 — A700052 VMAC Air Test Tool
Install orifice here
Orifice
Ball valve
Setup, Performance Testing and
Adjustments
