6.2 Notification Applicances Circuits (NACs)
A 2050 panel has two and 2250 panel has four conventional reverse polarity NAC circuits. It provides total 5A (including panel board
consumption, NACs and Aux circuits) and can support non-addressable notification devices.
2050 panel allows connection to up to two Class A or Class B NAC circuits.
2250 panel allows connection to up to four Class A or Class B NAC circuits.
The following TrueAlert non-addressable are special application compatible NAC devices:
• 4906 multi-candela series
• 4901 series horn
• 49CMT series horn
• 49CMTV series A/V
• 4903 series A/V Non-Addressable Horn/Visible
• 4904 series V/O Non-Addressable Visible Only
• 4902 series Non-Addressable Chime
• 4905-9835 Temporal code 4 Sync module
Refer Annexure A for list of devices and maximum quantity of devices supported
6.2.1 Wiring NACs
• Check that all wiring is between 18 AWG minimum and 12 AWG maximum.
• Check that conductors test free of all grounds and stray voltages before connecting to appliances and the control unit.
• All wiring is supervised and power-limited. All NAC circuits are regulated.
• Leave the supplied 10K, 1/2 W resistor across all unused NAC terminals.
• Terminate Class B circuits with listed 10K, 1/2 W end-of-line resistor harness, part number 0733-894.
6.2.1.1 Selecting an end-of-line resistor
The NAC Class B circuit supports 3.9K, 4.7K, 5.1K, 5.6K and 15K values for end-of-line (EOL) resistors to accommodate retrofit applications.
Use the UI option or PC tool to select an EOL value. For more information on the supported EOL resistors and the related supervisory
current, see Table 3.
Table 3: Supported EOLR and supervisory current
EOLR value Current
3.9K 5.7 mA
4.7K 4.8 mA
5.1K 4.4 mA
5.6K 4.0 mA
10K (Default) 2.2 mA
15K 1.4 mA
page 20 579-1404 Rev A
2050 and 2250 Foundation Series Fire Alarm Control Units Installation Guide
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