The P545 Series Electronic Lube Oil Control is
designed for use on refrigeration compressors
equipped with an oil pump that accepts a single-point
differential pressure switch. The P400 switch
continuously monitors net lube oil pressure and the
P545 control locks out the compressor if lube oil
pressure falls below the manufacturer’s recommended
net pressure for longer than the recommended lube oil
time delay. Front-mount Light-Emitting Diodes (LEDs)
indicate the status of the lubrication system, and a
user-selectable, minimum-off time delay can be set to
minimize compressor short cycling.
A Johnson Controls/PENN® R310AD Current Sensing
Switch, sold separately, may be used to disable the
P545 control lockout circuit during abnormal
compressor shutdowns.
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