Carrier 17/19EX - Manual (Page 221)

Weekly Maintenance
Check the Lubrication System
Mark the oil level on the reservoir sight glass, and observe the level each week while the
machine is shut down.
If the level goes below the lower sight glass, the oil reclaim system will need to be checked
for proper operation. If additional oil is required, add oil as follows:
On hermetic machines, add oil through the oil drain charging valve ( Figure 3 , Item 26.) A
pump is required for adding oil against refrigerant pressure. On open-drive machines, oil may
be added through the oil drain and charging valve ( Figure 2 , Item 18) using a pump. However,
an oil charging elbow on the seal-oil return chamber ( Figure 6 ) allows oil to be added without
pumping. The seal oil return pump automatically transfers the oil to the main oil reservoir. A
pump is required for adding oil against refrigerant pressure. The oil charge is approximately
15 gallons (57 L) for EX and FA (size 421-469) style compressors; 20 gallons (76 L) for EA (size
531-599) style compressors. The added oil must meet Carrier’s specifications. Refer to
Changing Oil Filter and Oil Changes sections. Any additional oil that is added should be logged
by noting the amount and date. Any oil that is added due to oil loss that is not related to service
will eventually return to the sump, and must be removed when the level is high.
An oil heater is controlled by the PIC to maintain oil temperature above 150 F (65.5 C) or
refrigerant temperature plus 70° F (38.9° C) (see the Controls section) when the compressor is