New unit has 5 service ports,which 1 port in low press.side and 4 ports in High press.side. One of 4 ports of high press.side is Low-press port which is located at discharge piping from Compressor.(See service manual)
4. Automatic pump down.
New unit has no manual valve for avoiding compressor damage due to valve mis-operation. Unit has automatic pump-down function.(See service manual)