Fire-Lite MS-10UD Series FACP - Manual (Page 38)

38 MS-5UD & MS-10UD Series Manual — P/N 52626:C4 3/7/2014
Installation Installation of Optional Modules
Wiring NACs and IDCs for Class A
Wire the Style Z (Class A) Notification Appliance Circuits using TB5 of the MS-5UD/MS-10UD
and TB2 of the CAC-5X module. Wire the Style D (Class A) Initiating Device Circuits using TB4
of the MS-5UD/MS-10UD and TB1 of the CAC-5X. Note that the wiring will be identical when
using TB7 NAC and TB6 IDC of the MS-10UD. Make certain to observe polarity when
connecting the devices to the circuits. The B+ and A+ terminals must comprise the feed and return
for the positive side of a device and the B- and A- terminals must comprise the feed and return for
the negative side of a device. To configure any of the zones for Class B when the CAC-5X is
installed, simply wire to the B+ and B- input on the FACP terminal(s) and install the End-of-Line
Resistor after the last device on the circuit. Do not wire to the corresponding A+ and A- terminals
on the CAC-5X module. For FCC compliance with Class A wiring, a ferrite bead (supplied with
the CAC-5X board) is required for NAC 1 and for NAC 2. If using NAC 1 and/or NAC 2 with
Class A wiring, a ferrite must be used for each NAC with wiring as shown in Figure 2.15.
Figure 2.15 Wiring NACs and IDCs for Class A Operation
CAC-5X Class A Converter Module
MS-5UD
Circuit Board
Class B (Style B) IDC - 4.7 K 
½ watt ELR resistor
P/N:71252 (supervised and power-limited)
Dummy load all unused
circuits - 4.7 K

½ watt resistor
(P/N: 71245)
Polarized
Bell
Circuit polarities
shown in alarm
condition
Class A (Style Z) NAC
(supervised and power-limited)
Class A (Style D) IDC
(supervised and power-limited)
Polarized
Strobe
Polarized
Horn
Smoke Smoke
Pull Station Pull Station
Heat
Heat
m
s10u
dcl
assa.w
m
f
B+ B- B+ B-
A+ A- A+ A- A+ A- A+ A- A+ A- A+ A- A+ A-
B+ B- B+ B- B+ B- B+ B- B+ B-
Ferrite Bead
p/n 50116546-001