Hi thank you so much that U answered my quseting. So I have other questions hope I get answer to them.

1\ What is the advantage of using a low pressure switch to control
Compressor operation?

2\ What should I do to set low pressure swith in order to maintain
A cabint temperature of approximately 15 degree F?

3\ What is the advantage of using a cabinet thermostat to control
Compressor operation?

4\ How is the automatic pumpdown helps prevent liquid migration during
The off cycle?

5\ What is the relationship between non-recycling pumpdown, leaking liquid
Line solenoidvalve,and compressor short cycling?

All these question sound like hw... look them up in your book