Carrier 17/19EX - Manual (Page 227)

To Change the Oil
1. Open the control and oil heater circuit breaker.
2. Drain the oil reservoir by opening the oil charging valve, ( Figure 2 , Item 18 or Figure 3 , Item
26). Slowly open the valve against refrigerant pressure.
3. Change the oil filter at this time. See Changing Oil Filter section.
4. Change the refrigerant filter at this time, see the next section, Refrigerant Filter .
5. Charge the machine with oil. The EX uses approximately 15 gallons (57 L), for EX and FA
(size 421-469) style compressors; 20 gallons (76 L) for FA (size 531-599) style
compressors in order to bring the level to the middle of the upper sight glass ( Figure 2 , Item
17 and Figure 3 , Item 19). Turn on the power to the oil heater and let the PIC warm it up to
at least 140 F (60 C). Operate the oil pump manually, through the Control Test, for 2
minutes. The oil level should be between the lower sight glass and one-half full in the upper
sight glass for shutdown conditions.
Refrigerant Filter
On hermetic machines with EX compressor, a replaceable core refrigerant filter/drier is
located on the refrigerant cooling line to the motor ( Figure 3 , Item 29). On FA style machines,
the refrigerant filter is located behind the compressor. The filter core should be changed once a
year, or more often if filter condition indicates a need for more frequent replacement. Change
the filter with the machine pressure at 0 psig (0 kPa) by transferring the refrigerant to the utility