Product Manual

CAP881
26
2. Oil flow path (refer to the flow chart of each type)
(1). Description of oil injection flow chart
Pressure in the separator pushes oil into the oil cooler and then passes through the oil filter for
filtration after being cooled down. Oil flow then goes into compression chamber from the bottom of
air end and also goes to the bearing on the discharge side for lubrication. The compressed air and oil
mixture is delivered to the Air/Oil Separator which then passes through the filter element separating
the oil from the air and discharging the oil back to the oil receiver.
(2). Volume of oil injection
The purpose of oil injection in an oil flooded screw compressor is to dissipate the heat away in the
process of air compression.
(3). Function of the parts in the oil flow system
A. Oil Cooler
The function of the oil cooler is similar to the air cooler. Oil is circulated through the oil cooler to
dissipate heat with additional cooling from the blower fan. Environment is a crucial factor for
air-cooled type compressors; install unit in a well-ventilated area. Clean the dust on the fins of
radiator periodically with compressed air or with solvent.
B. Oil Filter
Oil filters help get rid of metallic particles, and sludge from compressor oil in order to protect
bearings and rotors. After the first 500 hours of operation is reached, follow the instructions for
replacement. Failure to do so may result in lack of oil which will lead to high discharge temperature
and shorter bearing life.
C. Air/Oil Separator
a. Function
The filter element of the air/oil fines separator is made by multiple layers of filtration materials.
Most of the oil mist in the compressed air is filtered out through the separator filter element. The
life span of the air/oil separator filter element is affected greatly by lubricant grade and condition.
Use CurtisLubePlus FSC- 8000 in order to maintain your warranty. There is a pressure sensor and a
minimum pressure valve at the air/oil separator outlet. Compressed air is fed through the air/oil
separator, to the minimum pressure valve and discharged to its point of use, or to the after cooler
(on SEG-10 & 15 models) prior to discharge. Oil collected by the air/oil separator will return to the
suction side of the air end to avoid oil carry over.
b. Air/Oil Separator Filter Element needs to be replaced when:
1. Oil carry over increases.
2. Amp draw increases.