Ingersoll-Rand Doosan HP675WCU-T3, Operation & Maintenance Manual

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IQ System
The IQ System is a complete, self-contained system which provides cooler, cleaner air than
from a standard portable compressor. The system utilizes an integral aftercooler,
high-efficiency filtration, and a patented condensate disposal system to provide the cool, clean
air. The condensate disposal system injects all liquid condensed from the moisture separator
and filters into the engine exhaust system where it is vaporized by heat. This eliminates the
need for collecting the condensate, and the added cost of disposing of the condensate, which
is often regulated by local, state, and/or federal regulations.
When equipped with the low ambient feature, the IQ System automatically adjusts movable
louvers to control airflow through the aftercooler, ensuring that the compressed air
temperature always remains above freezing temperatures (typically 45°F (7°C)) at any
ambient temperature down to -10°F (-23°C). This prevents the need for 120V AC heat tracing
systems, or any manual adjustment to prevent freezing of the compressed air system. All drain
points for the condensate handling system are heated with 24VDC heaters, which are integral
to the compressor heater system.
Standard Non-Louvered configuration not to be operated below freezing.
IQ System Operating Instructions - 2
The compressed air exits the separator tank through the top cover piping, and can then travel
along one of two paths, selectable via manual valving.
One path allows Standard Operation, which bypasses the IQ System, and delivers air quality
equivalent to a standard oil-flooded portable compressor. If the IQ System is enabled by
proper setting of the selector valve, the compressed air first enters the aftercooler.
The aftercooler is cooled by the incoming compressor package air, which is controlled by
movable louvers mounted on the aftercooler (if equipped with low ambient option). At most
conditions, the louvers are fully open, and maximum aftercooling is available. The compressed
air and condensate (water with a small amount of compressor lubricant) exits the aftercooler
and enters the moisture separator, where most of the condensate is removed. The
compressed air then flows through two stages of filtration, where the aerosol water and oil is
removed down to approximately 0.01 ppm, and all particulates are removed down to 0.01
micron.
At the bottom of the moisture separator and both filters are strainers and constant-bleed
orifices, which are sized to allow the maximum flow of condensate while minimizing
compressed air loss.
The condensate lines are then piped together, and the condensate is injected at a single point
into the engine exhaust piping. The compressed air then travels through the minimum
pressure valve, and out through the service air valve. The air pressure gauge on the
instrument panel indicates the pressure inside the separator tank.
If the IQ System is bypassed (Standard Operation selected), the delivered air pressure will be
approximately equal to the separator tank pressure. If the IQ System operation is selected, the
delivered air pressure will be slightly less, depending on the restriction of the filters.