York Millennium YK M3 M3 G4 THRU YK S6 S4 J2 - Manual (Page 42)

42 YORK INTERNATIONAL
SECTION 5
OPERATIONAL MAINTENANCE
OIL RETURN SYSTEM
The oil return system continuously maintains the proper
oil level in the compressor oil sump. (See Figs. 18 &
19.)
High pressure condenser gas flows continuously
through the eductor inducing the low pressure, oil rich
liquid to flow from the evaporator, through the dehydra-
tor 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 rotor support and inlet end of the de-
hydrator.
2. Remove the dehydrator. Refer to Fig. 19.
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.
FIG. 19 – OIL RETURN SYSTEM
LD00950