How do I connect AC power to the Honeywell 6820 control panel?
Install a transformer, plug it into an appropriate grounded outlet, and then use the proper size connector to supply power from the transformer directly to the Control Panel's AC Power Terminal (See pages 35 for precise wiring instructions).
From the official Honeywell 6820 manual, page 4
Have a follow-up question?
Answers from the official manual.
Common questions