CB9A-020 page 7
OPTIONAL COMPONENTS
LOW OIL PRESSURE SWITCHES
Loss of crankcase oil pressure is a rare occurrence, but can result in costly damage. A low oil pressure switch
set at about 15 psig (1 bar-g) may be installed to stop the compressor in the event of a lubrication failure. A 10
second delay timer should be used to lock the low oil pressure switch out during compressor startup.
PRESSURE SWITCHES
Pressure switches may be installed in the suction or discharge gas stream as protective devices or for
compressor control. They may be used to stop or start the compressor, or to control the suction valve
unloaders. Their use will vary with each application.
INSTALLATION
LOCATION AND PIPING
Compressor life and performance can be significantly reduced when installed in an improperly designed system.
Before starting layout and installation of the piping system, consider the following suggestions:
1. A strainer should be installed in the inlet line to protect the compressor from foreign matter. A #30 mesh
screen or finer is recommended. Strainers must be cleaned regularly-once every 180 days, or more
frequently if the system requires.
2. All piping must be leak free to a pressure of 1.5 times the maximum system pressure.
3. Expansion joints, placed within 36" (0.9 m) of the compressor, will compensate for expansion and
contraction of the pipes.
4. Piping must be well supported so that it does not spring away or drop down when flanges or union joints
are disconnected.
5. Both suction and discharge piping should slope down from the compressor. The compressor should not
be placed at a low point in the piping system.
MOUNTING THE COMPRESSOR UNIT
A solid foundation reduces noise and vibration, and will
improve compressor performance. On permanent
installations it is recommended the compressor be secured
by anchor bolts as shown. This arrangement allows for
slight shifting of position to accommodate alignment with the
mounting holes in the base plate.
For new foundations, it is suggested that the anchor bolts
be set in concrete. When compressors are to be located on
existing concrete floors, holes should be drilled into the
concrete to hold the anchor bolts.
NOTE: To keep vibration at a minimum, in addition to a
solid concrete foundation it is important that the concrete be
located on a stable soil foundation. The base should have
complete contact along its entire length with the foundation.
Visible separations can result in vibrations which are
magnified in the upper part of the unit.
Pipe Type Anchor Bolt-Box
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