Sullair 600H User Manual page 27

SECTION 2
pressure during all conditions. This pressure is
necessary for proper air/fluid separation and proper
fluid circulation.
A minimum pressure/check valve at the outlet of the
receiver is installed to prevent compressed air in the
service line from bleeding back into the receiver on
shutdown when the compressor is being run in
parallel with other compressors tied to a large air
system.
Fluid is added to the receiver tank via a capped fluid
filler. A fluid level gauge glass enables the operator
to visually monitor the receiver tank fluid level.
WARNING
DO NOT remove caps, plugs and/or other
components when compressor is running
or pressurized.
Stop compressor and relieve all internal
pressure before doing so.
2.6 AFTERCOOLED AIR
SYSTEM, FUNCTIONAL
DESCRIPTION
The purpose of the aftercooled air system is to
operate the air compressor in conditions when
compressed air temperatures are required to be 10
to 25 ̊ F (5 to 13 ̊ C ) over ambient temperature. The
aftercooled feature of the compressor is controlled by
a system of two ball valves which are standard on all
large tier IV aftercooled compressor models. By
shifting both ball valves to the aftercooled position
the air flow from the receiver tank is forced through
the aftercooler producing aftercooled air. Moving the
ball valves to the standard position blocks air flow
600H, 700HH, 750, 750H, 750HH, 825, 900H, 1050 USER MANUAL
through the cooler producing standard air. The
ambient air, which is forced through the aftercooler
by the hydraulic fan, cools the compressed air as it
passes through the aftercooler core. Cooled air
enters the moisture separator where condensation is
removed from the cooler air and discharged. This
condensation does carry some oil and it should be
disposed of properly in accordance with local
regulations. A condensation drain port is located in
the frame on the curbside of the machine for
convenience of condensate removal. This drain port
should never be plugged or closed off in any way.
From the moisture separator the compressed air
goes through the discharge filters (if equipped) and
on to the service valve.
NOTE
When operating at temperatures below
freezing, the hydraulic fan will attempt to
compensate for colder temperatures by
slowing down or stopping. This will aid in
allowing the aftercooler to be used in tem-
peratures below freezing. When the After-
cooler Discharge Temperature (ADT)
approaches freezing, the controller will
warn of an imminent freeze alert. After-
cooled air should not be used in condi-
tions where ADT is approaching freezing
temperatures as this may cause damage
to the aftercooled air discharge system.
To operate in the non-aftercooled mode,
position both aftercooler bypass valves to
close off the aftercooled air circuit.
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