Vmac UNDERHOOD 70 Installation Manual page 51

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Allow the vehicle to reach operating temperature.
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Turn on the compressor.
Analog Throttle Control
☐
When the VMAC system is first engaged, the engine speed should increase
to between 1,800 rpm and 2,200 rpm and then drop down to VMAC base
idle (approximately 1,000 rpm) once system pressure is reached.
Digital Throttle Control
The VMAC digital throttle is a "slow ramp" throttle. Each time the
system is powered on, it will quickly increase engine speed to 1,500
rpm; then increase to maximum VMAC rpm over 8 seconds (provided
the system has not reached full system pressure before maximum
VMAC rpm is reached).
After the initial slow ramp, the throttle will respond normally to air
demand
☐
When the VMAC system is first engaged, the engine speed should increase
to 1,500 rpm and then drop down to VMAC base idle (approximately 1,000
rpm) once system pressure is reached.
With the system running, check for:
☐
Coolant leaks.
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Compressor oil leaks.
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Allow the compressor to run until the system reaches full system pressure.
☐
Engine speed should reduce to between 900 rpm to 1,100 rpm.
☐
Turn off the compressor.
☐
Shut down the engine.
☐
Check the compressor oil level after the engine has been shut down and the oil
level has had time to stabilize.
Ensure any stored air is drained from the system prior to adding oil.
☐
Add oil as necessary to bring the level to the "FULL" line in the sight glass and
check for leaks.
☐
Start the engine.
☐
Turn on the compressor and allow it to build to full system pressure.
☐
Release the park brake.
•
The control box should read "PARK BRAKE", the compressor clutch should
disengage and engine speed should reduce to OEM idle.
☐
Re-engage the park brake and start the compressor.
☐
Allow engine speed to stabilize after re-engaging the compressor.
VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: www.kb.vmacair.com
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