Sullair 300HH, User Manual, Page: 22 / 80

300HH, 375, 375H, 375HH, 425 AND 425H USER MANUAL R00 SECTION 2
20
1. Fluid Cooler
2. Engine
3. Compressor
4. Thermal Valve
5. Fluid Filter
6. Receiver Tank
Figure 2-2: Compressor Cooling and
Lubrication System
2.5 COMPRESSOR DISCHARGE
SYSTEM, FUNCTIONAL
DESCRIPTION
Refer to Figure 2-3 . The Sullair compressor unit
discharges a compressed air/fluid mixture into the
receiver tank. The receiver tank has three functions:
1. It acts as a primary fluid separator.
2. Serves as the compressor fluid reservoir.
3. Houses the air/fluid separator.
The compressed air/fluid mixture enters the receiver
tank and is directed against the side of the sump.
Because of a change of direction and reduction of
velocity, large droplets of fluid separate and fall to the
bottom of the sump. The small amount of fluid
remaining in the compressed air collects on the
surface of the separator element as the compressed
air flows through the separator. As more fluid collects
on the element surface, it then flows to the bottom of
the separator. A return line (or scavenge tube) leads
from the bottom of the separator element to the inlet
region of the compressor unit. Fluid collecting on the
bottom of the separator element 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 assure proper and
unobstructed flow. The receiver tank is code rated at
250 psig (17.1 bar) working pressure. A minimum
pressure device located downstream from the
separator, ensures a minimum receiver pressure of
80 psig (5.5 bar) during all conditions. Keeping this
pressure level stable is necessary for proper air/fluid
separation and proper fluid circulation. A pressure
relief valve (located on the wet side of the separator)
is set to open if the sump pressure exceeds 250 psig
(17.1 bar).
Fluid is added to the receiver tank through a capped
fluid filler.
2.6 CAPACITY CONTROL
SYSTEM, FUNCTIONAL
DESCRIPTION
Refer to Figure 2-4 , Figure 2-5 or Figure 2-6 . The
purpose of the control system is to regulate the
amount of air intake and match it to the demand
(required output) on the compressor. The control
system consists of a pressure regulating valve(s), air
inlet valve, system blowdown valve, pressure
transducer, speed control module, and tubing
connecting the various components of the
compressor and engine. The functional descriptions
of the control system are described by relating them
to four distinct phases of operation. They apply to
any control system with the exception of those with
specified pressures which are dependent on
pressure requirements. The given values apply to a
compressor with an operating pressure range of 100
to 110 psig (6.9 to 7.6 bar).
S
TART
—0 T
O
40
PSIG
(0 T
O
2.8 B
AR
)
When the compressor is started, the sump pressure
quickly rises from 0 to 40 psig (0 to 2.8 bar). During
this period the pressure regulator valve is inactive. At
this pressure range the idle warm-up control keeps
3
2
1
4
5
6
SU_0000664
WARNING
DO NOT remove caps, plugs and/or other
components when the ocmpressor is run-
ning or pressurized. Stop the compressor
and relieve all internal pressure before
removing these items.