What Are The Possible Interlocks For a Freon Compressor??

Are you having a specific problem or just seeking a tutorial on controls in a compressor circuit?

No..just want some information for doing a project..plzzz help.....

Some common interlocks for a freon unit:

1 Slider valve closed (used on screw comp)

2 Low suction pressure (not a problem on start up)

3 Hi discharge pressure

4 Low oil pressure (usually a difference between oil and dish. pressure)

5 Too low or high Oil temp (needs to be above minimum for start up)

6 Oil level in separator (if equiped) or sump

7 Cooling water flow( depending on application)

8 Some units may have high level trips on chiller or flash drum or reciever

This is a few but they are all a little different depending on age and whether it is hardwired controls or PLC.

Oil pressure is the difference between LOW pressure and oil pressure.

Thanks Fredski and Altennant....Its for programming in PLC..I'm just a beginner..Thank u so much for ur help...:)