The A421 Temperature Controls have a Basic and an Advanced setup menu. You can scroll through the parameter setup codes, view and edit parameter values, and set up your control for your application requirement. The control also has a Restricted adjustment menu. See Restricting user adjustment for more information.
Note: The A421 Control retains a copy of the saved parameter values in memory. When you change and save a new value, the new value immediately overwrites the previous value and saves to memory. In the event of a power failure, brown out, or when you disconnect power from the control, all of the current parameter values in memory are retained. Reconnecting power to the control restores all of the saved values.