York R-134a - Operational Maintenance; Oil Return System and Dehydrator

JOHNSON CONTROLS
19
FORM 160.76-O1
ISSUE DATE: 05/22/2019
4
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.
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 lter-drier.
4. Open evaporator stop valve and check dehydrator
connections for refrigerant leaks.
5. Open all the dehydrator stop valves.
OIL EDUCTOR BLOCK
SOLENOID VALVE
SOLENOID VALVE
CONDENSER
EV
APORATOR
DEHYDRATOR
STOP VALVE
STOP VALVE
CHECK VALVE
COMPRESSOR
FIGURE 8 - OIL RETURN SYSTEM
LD08578