i am useless with cad s/w if needed i can open the icecream tub containing the fridge controller and take a few snaps.
but lets take it one step at a time..
1) get bits n tools together, including some spare flex suitably rated (1mm sq minimum) to cut up for connecting wires, and a 3 x connector 'leggobrick' again suitably rated (10A+)..
2) take your mains power in lead and ensure its not plugged in and turned on (i doubt it would be)
and free the live neutral and if present earth wires about 2-3" and thread thrugh any grommets/glands or box holes bare the wire ends and connect each wire to seperate connectors in the leggo brick.
3) cut 2 x brown and 1 x blue length of flex wire 2-3" or longer? (to connect leggo brick and stc2000) and strip each end.
4) use 1 x brown wire and 1 x blue wire to connect from the corresponding leggo brick terminals to the power in terminals of the control box. (it isnt important which way round)
5) use the 2nd length of brown wire to connect up from the 'brownwire' terminal of the leggo brick to one side of the control relay.
6) get the flex from the device you want to control, feed it through any glands/grommets and box holes, bare the wires, and strip the ends of each strand.
7) connect the live (brown) wire from your device flex to the other relay terminal on the stc2000.
8) connect the neutral and eath from the device to the corresponding terminals on the leggo brick connector.
DONE..
You should have:
1 x earth wire from your mains in lead connecting via the leggo brick connector to the earth of the device you are controlling.
the live terminal in your leggo brick will have the 1 wire in from the power in lead and have 2 wires out,
1 to the stc2000 power in, and 1 to the control relay.
the neutral terminal in your leggo brick should have 1 wire in from the mains lead and 2 wires out 1 to the power terminal of the stc2000 the 2nd to the neutral wire of your heat/cold device..
And the live wire to your heat/cold device will be connected directly to a stc2000 control relay terminal
check every terminal is secure, and each wire is fully inserted and not split with stray strands..
If the box/enclosure is metal It would also be prudent to earth the chassis too.
And you should be good to go..
If in doubt take a snap and post it..
btw im not qualified to give electrical advice in any way...