6.5 Auxiliary power
There are two on-board auxiliary power circuits on the FACU:
• Aux. 1: Non-resettable power
• Aux. 2: Resettable power
Figure 21: Auxiliary power connections
Table 10: Auxiliary power specifications
Specification Rating
Voltage 24 V, 0.25 A maximum available at aux circuit. Total 0.25 A for both
circuits.
Voltage rating 24 VDC special application
1 V peak-to-peak ripple max.
Total availability from both NACs, both auxiliary circuits and panel
board
2.2 A
6.5.1 Auxiliary power wiring
To wire an auxiliary power circuit, ensure you adhere to the following guidelines:
• All wiring is between 18 AWG minimum and 12 AWG maximum.
• Both Aux-1 and Aux-2 circuits are unsupervised and power limited.
• Both Aux circuits require external supervision relay 2098-9735 in order to achieve Class B supervision.
• Aux-1 must be used to power 2606-9111 annunciators only.
• Aux-2 must be used to power 4-wire detectors.
• Conductors test free of all grounds and stray voltages before you connect the auxiliary power circuit to the control unit and other
appliances.
• Operate compatible devices from a range of 20 VDC to 27 VDC or greater. Compatible devices require a total current draw of 250 mA
or less.
• AUX power wiring must be only class B.
6.6 USB interface
You can use the USB interface to connect the control unit with a PC or operating system for programming the control unit and for
upgrading the control unit firmware.
page 28 579-1402 Rev B
2004 Foundation Series Fire Alarm Control Unit Installation Guide
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