Section 5
COMPRES SOR SYSTEMS
18
Figure 5---2 Encapsulated Compressor System
The air/fluid mixture discharges directly into the
fluid management system.
The fluid cooler bypass valve helps assure proper
cooling by directing the fluid to the fluid cooler
when discharge temperature reaches the thermo-
stat temperature setting.
During start---up in cool ambient conditions, the
cooler pressure drop may cause the filter bypass
valvet oopenup, assuringadequate fluidsupplyto
the compressor.
All fluid entering the compressor unit passes
throughthe replaceablefluidfilterelement. Thisre -
placeable filterelementcontainsa built---inbypass
valve. Under conditions of restricted flow t hrough
the element, the bypass valve helps ensure ade-
quate compressor fluid flow, as well as helps pre-
vent element failure.
FLUID MANAGEMENT SYSTEM
Thefluidmanagementsystemconsistsofamulti--
chamberedprimary/secondaryseparator,thefi-
nal a ir/fluid separator element, cooler bypass
and fluid filter.
As compressed a ir/fluid enters the sump, the first
fluid separation takes place due to a reduction of
flow speed coupled with a change of direction of
the flow within the sump housing. Then the com-
pressed air reaches the separator where the finest
fluid drops and mist are separated.
The minimum pressure/discharge check valve is
mounted on the compressor drive housing. Its
functions are as follows:
1. Maintains a minimum sump pressure of 60 psig
(4.2bar)underfullloadoperationtohelpassure
adequate fluid pressure.
2. Acts as a check valve t o isolate the compressor
from the system at shutdown or unload.
DRIVE MOTOR
The drive motor consists of a squirrel cage induc-
tion motor which is connected to the integrated
drive gearing by a drive coupling.
5.4 COMPRESSOR COOLING SYSTEM, FUNC-
TIONAL DESCRIPTION
The compressor cooling system consists of a fluid
cooler, fan and cooler shroud.
The fan is mounted on the compressor shaft. Air is
drawn through the motor adaptor by the fan and
exitsthroughthe coolers on topof the compressor.
The air provides cooling for compressor fluid and
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