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?

caibuadday

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