Carrier 17/19EX - Manual (Page 48)

Open-Drive Machines (17 Series) Lubrication Cycle
Summary
The main oil pump and oil reservoir are contained in the compressor base. Oil is pumped
through an oil cooler and a filter to remove heat and any foreign particles. A portion of the oil is
then directed to shaft-end bearing and the shaft seal. The balance of the oil lubricates the
compressor transmission and the thrust and journal bearings. The bearing and transmission oil
returns directly to the reservoir to complete the cycle. Contact-seal oil leakage, however, is
collected in an atmospheric float chamber to be pumped back to the main reservoir as the oil
accumulates.
Details (See Figure 6 )
Oil may be charged into the reservoir (1) through a hand valve (2) which also functions as an
oil drain. If there is refrigerant in the machine, however, a hand pump will be required for
charging at this connection.
An oil-charging elbow (Item 20) on the seal-oil return chamber allows oil to be added without
pumping. The seal-oil return pump (Item 21) automatically transfers the oil to the main reservoir.
Sight glasses (Item 6) on the reservoir wall permit observation of the oil level.
A motor-driven oil pump (Item 5) discharges oil to an oil cooler (Item 7) at a rate and pressure
controlled by an oil regulator (Item 4). The differential oil pressure (bearing supply versus oil
reservoir) is registered on the control panel.