Section 4 - Operational Maintenance; Oil Return System; Changing The Dehydrator; Figure 8 - Oil Return System - York R-134a Operation And Maintenance Manual

FORM 160.76-O1
ISSUE DATE: 05/22/2019

SECTION 4 - OPERATIONAL MAINTENANCE

OIL RETURN SYSTEM

The oil return system continuously maintains the
proper oil level in the compressor oil sump (See
Figure 8).
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.
SOLENOID VALVE
CONDENSER
EVAPORATOR

FIGURE 8 - OIL RETURN SYSTEM

JOHNSON CONTROLS

CHANGING THE DEHYDRATOR

To change the dehydrator, use the following procedure:
1. Isolate the dehydrator at the stop valves.
2. Remove the dehydrator (See Figure 8).
3. Assemble the new filter-drier.
4. Open evaporator stop valve and check dehydrator
connections for refrigerant leaks.
5. Open all the dehydrator stop valves.
COMPRESSOR
CHECK VALVE
STOP VALVE
OIL EDUCTOR BLOCK
SOLENOID VALVE
DEHYDRATOR
STOP VALVE
LD08578
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