We have three York centrifugal chillers with the following spec
Series YT Codepak
Unit Model YTH3J3E35COG
Capacity 500 Tons
Compressor Model YDTL.126
Starter SSS 26L-50A (LCSSS)
As per the design, the chiller should trip on Low Evaporator Pressure (falling 5.42psi). One of the chiller does not trip on this particular value (even lower) than this.
I've changed a few cards but to no avail. Can anyone guide me as to what could be the problem.