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The FAC-2100 controller basic root ordering code is:

FAC2100-DC28DC-28-C

This describes a unit that accepts DC input power, provides 28V on the axillary power output terminals, uses a standard relay board (reference Relay Outputs for more information), and has circular connectors.

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To change the installed relay option, append a -R to the end of the root ordering code. In addition, append three digits where each digit is an 'A' or a 'D'. The last three digits indicate if relay #2, #3, and #5 (respectively) should be AC (A) or DC (D).

FAC2100-DC28DC-28-C-RX₂X₃X₅, where:

• X_n is either an 'A' or 'D' and specifies if the output is AC or DC, and
• n in X_n is the solid state relay number.

For example:

• FAC2100-DC-DC2828-C-RDDA specifies that there should be DC solid relays for relay #2 and #3 and an AC solid state relay for Relay #5.
• FAC-2100-DC28DC-28-C-RAAA specifies that relays #2, #3, and #5 should all be AC solid state.