2.5.3 NAC Follower Input
For fire-only applications, the NAC follower input may be used to trigger the onboard NAC.
Strobes driven by the onboard NAC must be visibly isolated from FACP NAC(s).
This can be accomplished by connecting the NAC Follower input at TB18 of the control board to
the FACP's NAC output. The ECC-50/100 NAC output will then follow the FACP's NACs. A
redundant pair of terminals is provided at TB18 for convenient connection of an EOL resistor, or
for wiring to any additional equipment requiring this feature (such as an FCPS-FS6/8 remote power
The NAC Follower input is power-limited (Class 2) (refer to Section 2.12, "UL Power-limited Wir-
ing Requirements", on page 49) and supervised by the host FACP. Supervision requires that a
4.7 KΩ EOL resistor be connected to the last device in the NAC Follower chain.
to next device
2.5.4 Night Ring
The external audio input allows a building's Private Branch Exchange (PBX) to activate the ECC-
50/100. Connections need to be made to TB16 on the main control board and to TB5.1 and TB5.2
on the display board. Refer to Section 1.2.2 for electrical specifications to the external audio input.
Emergency Command Center Manual — P/N LS10001-000FL-E:G 5/3/2016
alarm polarity shown
4.7K ELR needed for
last device in chain.
2 3 4
Figure 2.10 NAC Follower Wiring
external audio input
TB5 on display
Figure 2.11 Night Ring Wiring
from FACP NAC (or NAC Follower
output) or previous device
ECC-50/100 Main Control Board
TB16 on main