For two speed operation, speed 1 is activated when power to the
PREDATAIR is turned on. This is set for the minimum desired CFM.
Speed 2 is connected to the purple wire and set to the maximum
desired CFM (Figure 9).
The system must be at or above the minimum hydraulic
oil flow before starting the PREDATAIR.
Always allow for efficiency loss as the hydraulic oil heats. Operate
the system for at least one hour at full load and monitor hydraulic
flow at speed 1 and speed 2 (if applicable). Adjust as required to
ensure that speed 1 flow does not drop below the minimum
requirement. A flow meter should be temporarily plumbed into the
PREDATAIR return line to confirm actual hydraulic flow. A load tester
with the load valve adjusted to zero can be used.
3.3.1 Single Speed
For single speed operation, do not use the purple wire from the
PREDATAIR wire harness. Connect a throttle control so that the
engine goes to the desired speed when power to the PREDATAIR is
turned on (Figure 8).
Red
Purple
Green
From PREDATAIR
Power circuit
Throttle control
12V input when
Power circuit is
switched on
Speed 1
Set speed 1 to achieve desired CFM
(not connected)
Figure 8 – Single speed operation
VMAC – Vehicle Mounted Air Compressors
Toll Free:
1-888-241-2289 Local: 1-250-740-3200
Fax: 1-250-740-3201
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