Trane Alco Controls FD113A22-088 Safety Control

The Trane Alco Controls FD113A22-088 Safety Control is a differential oil pressure safety switch for refrigeration and HVAC compressors that monitors oil pressure and initiates a timed shutdown when lubrication pressure falls below the preset level. Its design supports commercial refrigeration systems, chillers, air conditioning units, and industrial HVAC equipment that require automatic compressor shutdown during unsafe oil pressure conditions. Key specifications include supply voltage 24–240 VAC/DC, dual 1/4 in SAE flare pressure connections, maximum working pressure 300 PSI, maximum proof pressure 450 PSI, adjustable differential 4–65 PSID, and a timer delay of 20–150 seconds (factory setting 120 seconds); the reset is manual and the enclosure is IP30 rated. Common replacements include Emerson Alco FD113-ZU and Johnson Controls P45NCA Series Oil Pressure Control.