VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: www.kb.vmacair.com
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Remove the orifice from the VMAC Air Test Tool.
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Open the ball valve slowly, until the system maintains approximately 85 psi.
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Allow the system to run for 3 minutes while the VMAC digital throttle calibrates
itself. During this time, engine speed may gradually increase until achieving the
maximum VMAC rpm (2,400 rpm).
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Close the ball valve.
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Allow the compressor to run until the system reaches full system pressure.
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Confirm all air valves are closed and the system has no air leaks.
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Turn off the compressor.
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Ensure any stored air is drained from the system.
Final Testing
Ensure the following has been completed:
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Operate the system with an air tool (or the VMAC Air Test Tool with the
appropriate orifice installed) for at least 1/2 hour (1 hour preferred).
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Road test the vehicle for approximately 14 miles (20 km).
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Observe the compressor operation to ensure that the belt alignment is good
and nothing is rubbing or contacting hot components.
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Check all components, connections and fasteners once the engine is turned off
and the system has cooled.
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Check the coolant level after the engine has been operated.
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Check the compressor oil level after the engine has been shut down and the oil
level has had time to stabilize.
When first installed, the VMAC digital throttle will perform an auto-
calibration as it adjusts to the vehicle's tune, this process takes
approximately 3 minutes.
With the brake pedal firmly depressed, shift the truck into “REVERSE”*.
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*The engine speed reduces to OEM base idle (Approximately 650 rpm).
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*The green LED on the control box remains illuminated.
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*The “STATUS” and “PRNDL” LED’s on the digital throttle control will turn off
and engine speed will reduce to base idle.
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*Shift the vehicle back into “PARK”.
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*Cycle the compressor off, then on again to reset the safety parameters.
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Repeat these steps in all gear selector positions to ensure the engine speed
does not increase unless the gear selector is in “PARK”.
Digital Throttle Auto Calibration
