Ranco wiring

[Ncreefer]

The directions aren't to clear. Where hot ground and netural go. Which side is plug for wall and plug for heater.

 

[Kyuss414]

The green earth ground you can just tie right to the plug for the heater (the load side in the diagram).

Nice little write-up here as well...
https://www.instructables.com/id/Wiring-a-RANCO-ETC-111000-000-Digital-Temperature-/