3. The compressor will activate and build air pressure to
approximately 40 psi until the compressor has reached operating
temperature.
4. When the compressor reaches operating temperature it will “load
up” and build air pressure to system pressure, (120psi). If the
system has been wired for two-speed operation, the engine will
speed up to build air pressure faster. If the hydraulic oil has not
reached 41°F (5°C), or the compressor has not reached 70°C
(158°F), air pressure will only build to 120 psi to reduce the load
on the hydraulic system. The compressor can still be used during
this stage of operation.
5. Once the system reaches full pressure, the compressor will
unload and, if the engine speed had increased, it will drop to
base speed to unload the hydraulic system. You may hear a hiss
as air pressure is reduced to approximately 40 psi. If air pressure
does not drop below the restart point after two minutes, the
hydraulic motor will turn off and the display will read “STANDBY
XXX PSI”. This delay time is adjustable.
6. When air is used and the pressure drops, the sequence of load
up and unload will repeat, along with truck engine speed if the
system is wired for two speed operation. The system may restart
occasionally even without air use to maintain correct compressor
operating temperatures.
A small reservoir is recommended to reduce cycling
between the load and unload modes.
Shut-down
1. When operations are complete, stop the PREDATAIR with the
“OFF” button. Residual pressure in the compressor will blow-
down automatically.
2. Disengage the hydraulic system.
3. Close the hydraulic shut-off valve (if equipped).
4. Turn off the power supply to the PREDATAIR.
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