Installation
P/N 06-237041-001 2-37 February 2011
2-8.7 Wiring R-NAC (Combination) Circuits
The FenwalNET 8000-ML control unit has two on-board R-NAC circuits that can be used either as
notification-appliance circuits (NACs) or as releasing circuits. The R-NAC circuits are labeled RNAC1
and RNAC2. These circuits have field-wiring connections that terminate at J17 and J18, respectively.
If desired, an R-NAC Expansion Card offers three additional R-NAC circuits.
R-NAC circuits can be wired as:
• CLASS-A (4 wire) Power Limited
• CLASS-B (2 wire) Power Limited
• CLASS-B (2 wire) Non-Power-Limited
When wiring for CLASS-A, resistors need to be connected to a separate conductor to avoid placing
two conductors inside a connector terminal. A wire nut can be used to connect incoming field wiring
to a resistor and connect lead wires to a connector.
2-8.7.1 R-NAC CIRCUITS USED AS NACS
Each 24 Vdc regulated R-NAC circuit can supply up to 1.5 A of current (for synchronizable devices)
or 2.0A (for non-synchronizable devices) at a nominal 24 Vdc for polarized notification appliances.
Note: For enclosures which include one or two power supply units, total current output of the
FenwalNET 8000-ML must not exceed 5.4 A per power supply unit. For enclosures which
include three or more power supply units, total current output must not exceed the
parameters listed in Appendix A, Section A-5, Calculating Maximum Load For Multiple
Power Supply Units In One Enclosure.
Both NAC circuits are supervised, power limited, and are compatible with conventional, UL-Listed,
24-Vdc notification appliances such as:
• MT Series Multi-Tone Horns and Horn/Strobes
• NS Series Horn/Strobes
(See Note 1)
• NH Series Horns
• RSS(P) Series Strobes
(See Note 1)
• Exceder Series
(See Note 1)
• Commander Series
(See Note 2)
NOTE 1: These strobes can be programmed for synchronization.
NOTE 2: Commander Series strobes require the manufacturer’s synch module to synchronize
devices.
Horn/strobe combination devices utilizing the appropriate synch protocol have the option to use
silenceable horns and non-silenceable strobes. Refer to the horn/strobe manufacturer’s installation
sheet for details.
Use Figure 2-31 to estimate the maximum length of wire as a function of notification-appliance
current for an R-NAC circuit used as a NAC.
WARNING
All strobes are designed to flash with continuous applied voltage. Strobe notification
appliances cannot be used on pulsing signaling (NAC or R-NAC) circuits. You must use a
separate notification circuit if the application requires a pulsing signaling circuit for
horns. Failure to adhere to this warning may cause system malfunction.
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