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FORM 160.67-O2
ISSUE DATE: 10/9/2020
SECTION 4 - OPERATIONAL MAINTENANCE
COMPRESSOR OIL RETURN SYSTEM
The oil return system continuously maintains the prop-
er oil level in the compressor oil sump.
High pressure condenser gas flows continuously
through the eductor inducing the low pressure, oil rich
liquid to flow from the evaporator, through the dehy-
drator to the compressor sump.
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 the oil sump and inlet end of the de-
hydrator.
OIL FROM
TEMPERATURE
CONTROL VALVE
LIQUID INJECTION
SOLENOID
(J COMPR. ONLY)
FIGURE 14 - OIL RETURN SYSTEM
JOHNSON CONTROLS
2. Remove the dehydrator.
3. Assemble the new filter-drier.
4. Open condenser stop valve and check dehydrator
connections for refrigerant leaks.
5. Open all the dehydrator stop valves to allow the
liquid refrigerant to flow through the dehydrator
and condenser-gas through the eductor.
COMPRESSOR
STOP VALVE
OIL TO COMPRESSOR
OIL COOLER
OIL EDUCTOR BLOCK
SOLENOID VALVE
DEHYDRATOR
LD09607
63
4
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