Vmac UNDERHOOD 70 Installation Manual page 55

The "PRK BRAKE" LED will remain illuminated at all times, regardless
of park brake position.
MAX RPM
The cfm produced by the system is directly related to engine speed; this system
delivers 70 cfm at 2,400 rpm.
Maximum VMAC rpm can be adjusted between 1,000 rpm and 2,600 rpm (in 50
rpm increments) via the "" or "" buttons in the "MAX RPM" column.
If the system is at full system pressure while the rpm is being
adjusted, the engine speed will increase to the new value for 4
seconds, then return to base idle.
RAMP UP PRESSURE
"RAMP UP PRESSURE" is the amount of pressure the system will drop before the
engine speed is increased to generate air; as air continues to be used and the
pressure drops, engine speed will increase until maximum VMAC rpm is achieved.
"RAMP UP PRESSURE" is set to 140 psi (10 psi below the factory default maximum
system pressure of 150 psi). This allows for a small amount of air use without the
need to increase engine speed.
"RAMP UP PRESSURE" should only be adjusted if the maximum
system pressure is changed (via the inlet regulator). To maintain
proper performance, and rapid response to air demand, ensure
the "RAMP UP PRESSURE" is set at no more than 20 psi below the
maximum system pressure.
The "RAMP UP PRESSURE" can be set to "100 PSI", "120 PSI", "140 PSI", or "160
PSI via the "" or "" buttons in the "RAMP UP PRESSURE" column; an LED will
illuminate beside the setting that has been selected.
Factory Reset
The throttle control can be reset to factory default values via a button inside the
throttle control box.
To perform a factory reset, turn the system on and allow the engine speed to drop
to VMAC base idle (approximately 1,000 rpm). Using a paper clip (or similar object),
push and hold the factory reset button for 5 seconds. All of the LED lights will
illuminate for several seconds while the settings revert to their defaults. Once the
LED's return to their normal state, the system is ready for use again.
VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: www.kb.vmacair.com
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