Controlling and Silencing Four NACs
5.2 Controlling and Silencing Four NACs
In this application, the power supply has been set as a master with synchronized, silenceable outputs
(see SW1 switch settings in following illustration). The four NAC (Notification Appliance Circuits)
output circuits can be silenced in the sync generation mode by removing alarm input from Signal
Input 2. This can be accomplished using two addressable modules as illustrated in Figure 5.2.
The FACP must be capable of a visual annunciation to the silencing status of the output or zone(s)
to which the HPFF unit(s) are connected. The addressable modules are shown to demonstrate the
use of a remotely mounted device associated with an addressable fire alarm control panel. The
module could be replaced with any circuit capable of polarity reversal, such as an FACP NAC.
Two independent inputs are required for silencing. Two separate addressable modules can be used
as shown in Figure 5.2, mounted on the control board (one on the other) or in a separate UL-Listed
panel. Alternately, two outputs of a six-output addressable module can also be used and mounted
on the Control board (see Section 5.3, "Split Alarm and Selective Silence").
All four NAC outputs will have silenceable sync for System Sensor devices.
Notes for Figure 5.2:
When the power supply is in normal/standby state, a trouble will result in an open circuit condition on the
control module output circuit (monitored by the End-of-Line Resistor on TB3). The HPFF's alarm input
circuit will always remain closed in the alarm state. Therefore, the Trouble contacts at TB2 need to be used
to report troubles to the FACP during an alarm. Section 4.1, "Supervised Functions and Field Wiring".
The addressable relay module must be programmed as a silenceable point at the FACP to allow silencing of
The addressable control module must be programmed as a non-silenceable point at the FACP.
Do not loop wires under screw terminals. Break wires to maintain proper supervision.
The value of the ELR (End-of-Line Resistor) across TB3 terminals depends on the control module used.
For a list of compatible devices, see Appendix A, "Device Compatibility".
The same gauge wire must be used if two conductors are connected to the same terminal of any terminal
Do not complete a continuous circuit around the screw terminal. There must be two separate wires on either
side of the screw at the terminal block. "T-tapping" is absolutely NOT ALLOWED.
HPFF12 NAC Expander — P/N 53576:B 11/24/2010
Figure 5.2 Controlling and Silencing Four NACs
Activated by Alarm
Activated by Alarm