375, 375H, 400HH, 425, 425H T4F User Manual 2: Description
02250223-036 R01
Subject to EAR, ECCN EAR99 and related export control restrictions. 19
The engine radiator, charge air cooler, and the compres-
sor fluid cooler are next to each other allowing the fan air
to push th
rough all three simultaneously. As air passes
through the fluid cooler, the heat of compression is
removed from the fluid. The compressor’s high capacity
fuel tank contains enough fuel for one eight hour shift
under normal operating conditions.
2.3 Sullair compressor unit,
functional description
Sullair compressors are single-stage, positive displace-
ment, oil-flooded lubricated-type compressors that pro-
vide continuous (pulse-free) compression to meet
various d
emand loads. Sullair compressors require no
routine maintenance or inspection of their internal parts
or systems. The compressor works by injecting fluid into
the compressor unit where it mixes directly with the air as
the rotors turn: the rotor’s rotation compresses the air.
The fluid flow has three main functions:
• It acts as a coolant, to control the rise of air
tem
perature which is gen
erated by compres-
sion (heat of compression).
• Seals the leakage paths between the rotors
and the stator and also between the rotors
themselves.
• Lubricates the rotors allowing one rotor to
directly drive the other.
After the air fluid mixture is discharged from the compres-
sor unit, the fluid is separated from the air. At this time,
the
air flows to th
e service line and the fluid is cooled in
preparation for re-injection.
2.4 Compressor cooling & lubrication
system, functional description
Refer to Figure 2-3. The compressor cooling and lubrica-
tion system is designed to provide adequate lubrication
as well as maint
ain the proper operating temperature of
the compressor. In addition to the fluid cooler and inter-
connecting piping, the system consist
s also of thr
ee other
components: a fluid filter, thermal valve, and a fan which
perform the following functions:
• The fluid filter removes and collects any con-
taminant
s in the fluid.
• The thermal valve functions as a temperature
regulator directing fluid either to the cooler or to
the compressor unit.
• The fan pushes air through the cooler dissipat-
ing the heat resulting from compression of the
fluid.
The functions of the lubrication
system are explained in
more det
ail below. Fluid is used in the system as a cool-
ant and as a lubricant: the sump serves as the fluid reser-
voir. At start-up, fluid flows from the sump to the fluid
ther
mal valve. Fl
uid circulation is achieved by forcing the
fluid from the high pressure region of the sump to a lower
pressure area in the compressor unit. A minimum pres-
sure device (see Section 2.5: Compressor discharge sys-
tem, functional description) is provided to assure
adequate fluid flow under all conditions. When entering
the the
rmal valve
upon start-up, the fluid temperature is
cool and thus it is not necessary to route it through the
cooler. The fluid flows through the fluid filter and on to the
compressor unit bypassing the cooler. As the compressor
continues to operate, the temperature of the fluid rises
and the thermostatic control opens, allowing a portion of
the fluid into the cooler.
When the temperature reaches 190°F (88°C), the ther-
mostat is fully open allowing all fluid entering the thermal
valve to f
low to the cooler
.
The cooler is a radiator type that works in
concert with
the engine fan. The fan pushes air through the cooler
removing the heat from the fluid. From the cooler, the
fluid is then routed back through the fluid filter. All fluid
flowing to the compressor unit passes through this filter.
Figure 2-3: Cooling and lubrication system
1. Fluid cooler 4. Fluid filter
2. Compressor 5. Receiver tank
3. Thermal valve
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