To configure the Kidde FX-10 for Class A wiring, you must change the circuit's Class setting in the panel programming menu. This process automatically pairs two adjacent Class B circuits to create a single Class A circuit (Page 10) [1].
Converting to Class A reduces the total available zones; an FX-10 supports a maximum of 5 Class A IDCs compared to 10 Class B IDCs (Page 1) [1].
Enter IDC programming mode.
Select the IDC you want to program by pressing its Disable button; the panel confirms the selection by lighting that IDC's trouble LED (Page 38) [1].
Navigate to Step 12 (IDC Class) in the programming options (Page 40) [1].
Change the value from Class B (default) to Class A (Page 40) [1].
Repeat these steps for each pair of circuits you wish to convert, noting that each Class A circuit consumes two physical IDC terminals (Page 10) [1].
