6.2 Notification appliances circuits
A 2004 panel has one conventional reverse polarity NAC circuit. It provides a total of 2.2 A, including panel board consumption, NACs and
Aux circuits.
With a 2004 panel, you can connect up to one Class A or Class B NAC circuit.
The following TrueAlert non-addressable devices are special application compatible NAC devices:
• 4906 multi-candela series
• 4901series 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
For a list of devices and the maximum quantity of devices supported, see Annexure A
Note: The NAC load must not exceed 1.5 A.
6.2.1 Wiring NACs
To wire NACs, ensure you adhere to the following guidelines:
• All wiring is between 18 AWG minimum and 12 AWG maximum.
• Conductors test free of all grounds and stray voltages before connecting to appliances and the control unit.
• All wiring is supervised and power-limited.
• Leave the supplied 10 k, 1/2 W resistor across any unused B- B+ NAC terminals.
• Terminate the Class B circuits with a UL listed 10 k, 1/2 W end-of-line resistor harness, part number 0733-894 or different value EOL
resistor. See the Selecting an end-of-line resistor section.
• Note: Use only UL listed EOLR with the values specified in Selecting an end-of-line resistor, otherwise use 10 k ohm EOLR harness
0733-894.
6.2.1.1 Selecting an end-of-line resistor
The NAC Class B circuit supports 3.9 k, 4.7 k, 5.1 k, 5.6 k and 15 k values for end-of-line (EOL) resistors to accommodate retrofit
applications.
Use the DIP switch SW3 to select the EOL value.
Table 3: NAC EOLR value selection
NAC EOLR values Switches 1, 2, 3 of DIP switch SW3
10 K ohm (Default) Off Off Off
3.9 K ohm (0734-171) Off Off On
4.7 K ohm (0733-896) Off On Off
5.1 K ohm Off On On
5.6 K ohm On Off Off
15 K ohm On Off On
Figure 14: DIP switch SW3
page 22 579-1402 Rev B
2004 Foundation Series Fire Alarm Control Unit Installation Guide
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