035-19569-101 (0109)
7-2
GB
7.1.6 Annually (more often if necessary)
1. Drain and replace the oil in the compressor oil sump
(See Oil Charging Procedure).
2. Evaporator and Condenser:
a. Inspect and clean water strainers.
b. Inspect and clean tubes as required.
c. Inspect end sheets.
3. Compressor Motor (See motor manufacturers
maintenance and service instruction supplied with
unit):
a. Clean air passages and windings per manufacturers
instructions.
b. Test winding insulation.
c. Lubricate ball bearings.
4. Inspect and service electrical components as
necessary.
5. Perform chemical analysis of system.
7.2 Oil Return System
The oil return system continuously maintains the proper
oil level in the compressor oil sump (Refer to Figures
2.6 and 7.1).
High pressure condenser gas fl ows continuously through
the eductor inducing the low pressure, oil rich liquid to
fl ow from the evaporator, through the dehydrator to the
compressor sump.
7.2.1 Changing the Dehydrator
To change the dehydrator, use the following
procedure:
1. Shut the stop valves on the condenser gas line,
oil return line to rotor support and inlet end of the
dehydrator.
2. Remove the dehydrator, refer to fi gure 7.1.
3. The nozzle of the eductor should be checked for any
foreign particles that may be obstructing the jet.
4. Assemble the new fi lter-drier.
5. Open condenser stop valve and check dehydrator
connections for refrigerant leaks.
6. Open all the dehydrator stop valves to allow the
liquid refrigerant to fl ow through the dehydrator and
condenser gas through the eductor.
COMPRESSOR
SOLENOID VALVE
CONDENSER
EVAPORATOR
CHECK VALVE
STOP VALVE
STOP VALVE
OIL EDUCTOR BLOCK
SOLENOID VALVE
DEHYDRATOR
Figure 7.1 Oil Return System
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