excessive soot buildup

How do I know if I need the total rubber kit versus just a check kit

Designed primarily for York air-cooled screw liquid chillers

How do I set the differential on the low side

Johnson Controls P74FA-5 Pressure Control Els PW 17895 excessive soot buildupThe Johnson Controls P74FA 5 is a high performance differential pressure control designed for sensing pressure changes across oil filters or pumps in heavy duty commercial HVAC and refrigeration systems. This SPDT snap acting switch provides reliable lube oil protection, ensuring that compressors do not operate under insufficient oil pressure. Featuring an adjustable range of 8 to 60 psi and a fixed 1. 5 psi switch differential, this Penn P74 series