Respected All,
i am a Automation Control Systems Engineer(PLC,SCADA,VFD..etc) i had undertaken a Control systems Project for a Cold storage Plant, i had 0 experience in Refrigeration Plants,
i need clarifications & advice's on Sequence of operation. configuration of Plant is
1.) 7 Cold-Chambers ( for storing vegetables,Cheese,ice creams,ready to eat products)
2.)3 reciprocating compressors ( 2- KC-42,1-KC-21)
3.)2-WATER-COOLED CONDENSOR
4.) Temperature has to be acheived -30*c
5.) Refrigerant is AMMONIA.

I Need to design the logic for Starting of the compressors based upon SUCTION PRESSURE.
so if anybody can explain me the relation of temperature & Suction pressure.

THANKS for any help