600H, 750, 750H, 750HH, 825, 900 & 900H USER MANUAL SECTION 2
26
2.7 AFTERCOOLED AIR
SYSTEM, FUNCTIONAL
DESCRIPTION
Refer to Figure 2-4. 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. Two discharge valves are provided on
all aftercooled compressor models. One valve is
labeled standard air and one valve is labeled
aftercooled air. Closing the standard air (non-
aftercooled) valve completely forces the air flow from
the receiver tank to the aftercooler. The ambient air,
which is drawn through the aftercooler by the engine
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 front 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.
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.
NOTE
Aftercooled system should not be operated
in ambient conditions below 32°F (0°C). If it
is necessary to operate in these conditions,
Sullair can supply optional equipment to
accommodate this requirement.
To operate in the non-aftercooled mode,
close the aftercooler service valve com-
pletely and open non-aftercooled valve.
Figure 2-4: Aftercooled Air System
1. RECEIVER TANK
2. MINIMUM PRESSURE
CHECK VALVE
3. AIR VALVE
4. AFTERCOOLER
5. MOISTURE SEPARATOR
6. DISCHARGE FILTERS
7. PNEUMATIC VALVE
8. STANDARD AIR OUT
9. AFTERCOOLED AIR OUT
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