NFS2-640/E Installation Manual —
P/N 52741:P2 7/10/14
37
NAC Connections and Releasing Circuits
Installation
3.8 NAC Connections and Releasing Circuits
The control panel provides four NAC terminals as shown in Figure 3.19. Each can be configured as
Style Y (Class B) or Style Z (Class A) as shown in Figure 3.18. Each circuit can provide 1.5 A of
current, but the total current drawn from the main power supply cannot exceed 7.4 A in alarm
condition (refer to Table A.2). Additionally, TB10, TB2, and all 4 NACs share a maximum of 3.0 A
in standby and 6.0 A in alarm; see Appendix A. NAC circuits are supervised and power-limited.
Use UL-listed 24 VDC notification appliances only (refer to the
Device Compatibility Document
).
nf
s6
40
-n
ac
o
ut
.c
dr
Style Y (Class B)
Connection
Style Z (Class A)
Connection
Unused Circuits
UL-listed ELR-2.2K,
1/2 W (supplied)
Figure 3.18 Notification Appliance Circuit (NAC)
Connections
Figure 3.19 NAC Terminals
and NAC LEDs
TB9 - NAC#1
TB8 - NAC#2
TB7 - NAC#3
TB6 - NAC#4
C
P
U2
-6
40
-NA
C
S
.wmf
A–
A–
A–
A–
A+
A+
A+
A+
B–
B–
B–
B–
B+
B+
B+
B+
NOTE: Any NAC can be programmed as a releasing circuit, and the releasing circuit must
be supervised; see Figure 4.8–Figure 4.10.
For more information, refer to Section 4
“Applications” in this manual and the
NFS2-640/E Programming Manual.
Refer to the
Device
Compatibility Document
for UL-listed compatible releasing devices. Sample connections for NAC
terminals are shown in Figure 3.18. Follow sequence of steps in Section 3.2 “Installation
Checklist”, Table 3.1; this is part of Step 6.
