600H, 750, 750H, 750HH, 825, 900, 900H, 1050 T3 CAT User Manual 2: Description
02250197-981 R01
Subject to EAR, ECCN EAR99 and related export control restrictions. 25
2.6 Compressor discharge system,
functional description
Refer to Figure 2-5. The Sullair compressor unit dis-
charges compressed air/fluid mixture into the r
eceiver
tank.
The receiver tank has three functions:
• It acts as a primary fluid separator.
• Serves as the compressor
fluid storage sump.
• Houses the final fluid separator.
The compressed air/fluid mixture enters the receiver
tank
and is directed against the tank side wall. By change of
direction and reduction of velocity, large droplets of fluid
separate and fall to the bottom of the receiver tank. The
fractional percentage of fluid remaining in the com-
pressed air collects on the surface of the final separator
ele
ment
as the compressed air flows through the separa-
tor. As more and more fluid collects on the element’s sur-
face, the fluid descends to the bottom of the separator. A
r
eturn
line (or scavenge tube) leads from the bottom of
the separator element to the inlet region of the compres-
sor unit. Fluid collecting on the bottom of the separator
e
lemen
t is returned to the compressor by the pressure
difference between the area surrounding the separator
element and the compressor inlet. An orifice (protected
by a strainer) is included in this return line to help assure
proper flow.
The receiver tank is code rated. A minimum pressure/
ch
eck valve
, located downstream from the separator,
helps assure a minimum receiver pressure during all con-
ditions. This pressure is necessary for proper air/fluid
sep
ara
tion and proper fluid circulation.
A minimum pressure/check valve at the outlet of the
receiver is inst
alled to prevent compressed air in the ser-
vice line from bleeding back into the receiver on shut-
down when the compressor is being run in
parallel with
ot
her 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.
2.7 Aftercooled air system,
functional description
Refer to Figure 2-6. The purpose of the aftercooled air
system is to operate the air compressor in conditions
when compre
ssed air temperatures are required to be 10
to 25°F (5 to 13°C) over ambient temperature. Two dis-
charge valves are provided on all aftercooled compressor
mo
dels. 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 dis-
charged. This condensation does carry some oil and it
sho
uld 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 con-
densate removal. This drain port should never be
plu
gged or
closed off in any way. From the moisture sep-
arator the compressed air goes through the discharge fil-
ters (if equipped) and on to the service valve.
WARNING
Do not remove caps, plugs and/or other compo-
nents when compressor is running or pressurized.
Stop compressor and relieve all internal pres-
sure before doing so.
NOTE
Aftercooled system should not be operated in
ambient conditions below 32°F (0°C). If it is nec-
essary 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 completely and
open non-aftercooled valve.
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