5.1 Controlling Four NAC Circuits from a Single Source
In this application, all four NACs (Notification Appliance Circuits) are controlled by single input
from a FACP (Fire Alarm Control Panel) as illustrated in Figure 5.1. The FACP could be replaced
by a supervised addressable control module associated with a fire alarm control panel.
If the Programming DIP Switches are set as shown below, all four NACs will follow (Pass-through)
the signal from the FACP.
All four NAC outputs will follow FACP output. FACP output can be steady on, coded, temporal, sync, etc.
Notes for Figure 5.1:
When the power supply is in normal/standby state, a trouble will result in an open circuit condition on the
FACP's NAC circuit (monitored by End-of-Line Resistor across 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. See Section 4.1, "Supervised Functions and Field Wiring".
The FACP's NAC circuit can be steady on, coded, temporal, Sync, etc.
The value of the ELR (End-of-Line Resistor) across TB3 terminals SIGNAL 2 +OUT & -OUT depends on the
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.
Section 5: Applications
Figure 5.1 Controlling Four NAC Circuits from a Single Source
HPFF12 NAC Expander — P/N 53576:B 11/24/2010