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Oil is charged into the reservoir (Item 1) through a hand valve (Item 4) which also functions
as an oil drain. If there is refrigerant in the machine, a pump is required for charging. Sight
glasses (Item 10) on the reservoir wall permit observation of the oil level. The normal operating
oil level is from the middle of the lower sight glass to the top of the lower sight glass.
The motor-driven oil pump (Item 8) discharges oil to an oil cooler (Item 12) at a rate and
pressure controlled by an oil regulator (Item 7). The differential pressure (supply versus return)
is registered at the control center. Oil differential pressure is maintained between 18 to 30 psi
(124 to 207 kPa).
The oil pump discharges oil to the oil cooler (Item 12). Oil is then piped to the oil filter
assembly (Item 9). This filter is capable of being valved closed to permit removal of the filter
without draining the entire oil system (see Scheduled Maintenance, Changing Oil Filter section
for details). The oil is then piped to the oil cooler (Item 12).
The oil cooler on the EX compressor is a plate-and-frame type, refrigerant cooled, heat
exchanger. The EX compressor oil cooler heat exchanger uses refrigerant from the condenser
as a coolant. The refrigerant cools the oil to a temperature between 110 and 120 F (43 and
49 C) supply oil temperature to the bearings.
The FA compressor oil cooler heat exchanger is water cooled. The water flow through the
cooler is manually controlled by a plug valve. The valve should be adjusted to maintain
approximately 145 F (63 C) in the oil sump during running conditions.