VMAC – Vehicle Mounted Air Compressors
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2.3.1 Wire Size Selection
Selecting the correct wire size is vital for proper operation. If the wire
size is too small, voltage drop will be excessive and the compressor
will operate erratically. Measure the length required for both the
power wire and the ground wire, add them together and select the
correct wire size from Table 1.
Total length of Power wire PLUS Ground wire Recommended Wire Gauge
Less than 10 ft. 12AWG
10 ft. to 15 ft. 10AWG
More than 15 ft. 8AWG
Table 1 – Wire gauge size
Never connect the PREDATAIR60 so that it switches on
at the same time as the PTO is engaged. This can cause
sudden, excessive hydraulic pressure which can
damage components.
2.4 Air Receiver Requirements
The PREDATAIR60 uses an unloader system which minimizes fuel
burn, equipment wear, cooling load, enclosure temperature,
hydraulic temperature and noise, when compressed air is not being
used. For this unloader system to work most efficiently, and to avoid
having the compressor loading and unloading too frequently, some
air receiver volume is very beneficial.
If the plumbing downstream from the PREDATAIR60 is tight, a 5
gallon air receiver is adequate. If a receiver tank is not possible,
then consider using the existing welded tubular structure within the
service body as an air receiver. For reference, 21’ of 3/16” wall 2-1/2”
x 2-1/2” square tube has a volume of 5 gallons.
If you use an auxiliary air tank with this system, the line to the
auxiliary tank must be installed as high as possible (not in the bottom
of the tank) to prevent water from clogging the line (Figure 10).
Failure to observe these requirements will result in damage to the
system.
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