I have a 2 wire system (3 phase), need to connect multi wiring system thermostat!
Need to know if, its correct to just use line#1, and the device already has a jumper?

Hi, Keith!

Greetings and WELCOME to the site! I just moved your question that you had posted in Introductions to this topic area so that it would get the most exposure to those who are best able to answer it. Introductions is for people to introduce themselves and we try to not ask questions there.

We would appreciate it if you would return to Introductions sometime to tell us a little about yourself though, if you would be willing to do that.

Thanks!

Please try your question again. Post brand names and exact model numbers for all equipment. The way your post reads now there cannot be any help.

Hi Keith! Welcome to AMHD!