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 dehydrator to the compressor sump.
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.
Figure 8: Oil return system
Model YK (Style H), R-134a and R-513A24
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