cascade cycle

[next life]

hey everybody
i'm working on cascade system
i built the mechanical system but until now i didnt start build the control and electrical CCT
what do i need for the control cct ? does anyone has a drawing for any cascade control cct ?
for more details about my cascade
( --hight stage : 3/4 hp 404a comp , low stage 1/3 hp r508b comp-- ,i want to reach -70 c )

[next life]

in general i need the ( operating conditions )

[The Viking]

???
In order to design the controls you will need to know the operating conditions...

:rolleyes:

[next life]

ok
i just need the system to reach -70 ,its ok for me for any condetions
whatever it takes , i need any example for cascade system
and i will apply it for my cascade