Description
P445 Series Electronic Lube Oil Control - solid-state oil failure cutout for pressure-lubricated refrigeration compressors, used with a P300 sensor or a P400 differential pressure switch.
The P445 Series is one of the Johnson Controls electronic lube oil controls. It monitors net oil pressure - the difference between oil pump discharge pressure and crankcase pressure - through a remote sensing element rather than a bellows and capillary, and locks the compressor out if oil pressure is not established at start-up or is lost for longer than the control's lube oil time delay.
Per the OEM compatibility table, a P445 control can be used with a P300 sensor (WHA-P300-xxx three-wire harness only) or with a P400 single-point differential pressure switch (WHA-P300-xxx or WHA-P400-xxx harness). When the P445 control is wired to a P400 switch, the Test button may operate when first powered up; however, after a couple of minutes of operation the Test Switch function no longer works, while all other control functions operate normally. With a P300 sensor the test function runs on a 6 to 8 second delay.
Applications
* Lube oil pressure protection for pressure-lubricated refrigeration compressors
* Semi-hermetic compressor oil failure cutout with electronic time delay
* Replacement control in existing P445 installations using a P300 sensor or P400 switch
Installation and Service (OEM, electronic lube oil control range)
* Mount the control in an upright position; No. 10 screws are provided and longer screws must not be used, as damage to internal components may occur
* The Universal Mount (Part No. 271-51) can be used to mount the control to a vertical or horizontal surface
* Do not attempt field repairs or calibration. Switches, alternate length wiring harnesses and replacement controls are available as separate items through local Johnson Controls wholesalers and the original equipment manufacturer
MODEL DATA NOT OEM-DOCUMENTED. No Johnson Controls product bulletin or selection chart specific to the P445NCB-22C could be located - the P445 Series is referenced in the OEM electronic lube oil control literature but its own ordering table was not available. The supply voltage, open point (differential pressure setting), lube oil time delay and output terminals for this dash number are therefore NOT claimed below. For orientation only: in the closely related P545NCB range the OEM bulletin pairs the -22 dash number with a P400AD-2 switch at an open point of 12.75 ± 0.75 psid - this must not be assumed for the P445. Read the settings from the control label and match the control to its sensor or switch before fitting.
Specifications
* Brand / Manufacturer: Johnson Controls
* Model / Part Number: P445NCB-22C
* Type: P445 Series Electronic Lube Oil Control (manual reset, NCB output configuration)
* Sensing Element (OEM): P300 Series differential pressure sensor (WHA-P300-xxx harness) or P400 Series single-point differential pressure switch (WHA-P300-xxx or WHA-P400-xxx harness)
* Measured Variable: Net oil pressure - the difference between oil pump discharge pressure and crankcase pressure
* Reset: Manual
* Supply Voltage: Not documented for this dash number - read from the control label
* Open Point (Differential Pressure): Not documented for this dash number - read from the control label
* Lube Oil Time Delay: Not documented for this dash number - read from the control label
* Mounting (OEM): Upright, with No. 10 screws provided; Universal Mount Part No. 271-51 available
* Repair (OEM): Do not attempt field repairs or calibration
* Reference Documentation: PENN Refrigeration Products Catalog, P400 section control and sensor/switch compatibility table; P545 Series Electronic Lube Oil Control Product/Technical Bulletin (documents the shared P300/P400 sensor and harness arrangement)
* Condition: New
Johnson Controls / Johnson Controls
P445NCB-22C / P445NCB22C
P445NCB-22C / P445NCB22C
Warranty Information
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