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P12 Series differential pressure controls can be used with oil and non-corrosive refrigerants. The switch is actuated by a difference in pressure between the two sensing elements. Connect this control to a P28 Lube Oil Control, with time delay, to monitor lubrication on two refrigeration compressors driven by one motor
P28 Series cutout controls measure the pressure available to circulate oil through a refrigeration compressor’s lubrication system. A built-in time delay switch, compensated for ambient temperature, enables pressure pickup on start, avoiding nuisance shutdowns on short-duration pressure drops during the running cycle. Use for semi-hermetic compressors.
P29NC is a low pressure control with time delay and lockout, and requires manual reset. A drop in pressure energizes the time delay relay, which then opens a contact and shuts down equipment. The time delay prevents nuisance shutdowns due to momentary fluctuations in system pressures.
P45 controls protect semi-hermetic refrigeration compressors by detecting low lube oil pressure. The low-adjustable factory-set pressure setting supports operation at the compressor manufacturer’s specification. A built-in time delay relay, compensated for ambient temperature, enables pressure pickup on start, avoiding nuisance shutdowns on short-duration pressure losses
P74 Series controls measure the pressure difference between supply lines and return lines. A change in differential pressure repositions the switching mechanism, causing corrective action. Use with chillers, water-cooled condensers, refrigeration compressors, and motor-actuated valves.
P128 and P145 Series
P128 and P145 Series controls provide dependable low pressure lube oil cutout for pressure-lubricated refrigeration compressors. P128 controls offer adjustable range settings. P145 controls are factory-set to compressor manufacturer’s specifications. Use for lube oil cutout on hermetic and semi-hermetic compressors in commercial air conditioning and commercial and industrial refrigeration systems.
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