Wiring Nacs And Idcs For Class A - Fire-Lite MS-2E' MS-4E User Manual

Installation
Class B (Style B)
IDC - 4.7 K
½ watt ELR
(supervised and
power-limited)
Class A (Style Z) NAC
(supervised and power-limited)
Polarized
Polarized
Polarized
Circuit polarities
shown in alarm
condition
B+ B-
NAC 1
26

2.6.1.2 Wiring NACs and IDCs for Class A

Wire the Style Z (Class A) Notification Appliance Circuits using TB2 of the MS-4
and TB1 of the CAC-4 module. Wire the Style D (Class A) Initiating Device
Circuits using TB3 of the MS-4 and TB1 of the CAC-4. 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-4 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-4 module. Note that Zone 1 IDC on the MS-2 and Zone 2
IDC on the MS-4 can be configured as a combination waterflow/supervisory circuit
as illustrated in the following figure.
IMPORTANT!
Ω All devices must be
within 20 feet of the
resistor Class A portion of
P/N:71252 the circuit and
wiring must be in
conduit.
Smoke
Bell
Strobe
Pull Station
Horn
1.2 K Ω
½ watt
Heat
In-Line
resistor
P/N:75579
B+ B- B+
NAC 2
ZONE 1 ZONE 2
A+ A- A+ A-
CLASS A CLASS A
CLASS A CLASS A
NAC 1 NAC 2
CAC-4 Class A Converter Module
Figure 2.11 Wiring NACs and IDCs for Class A Operation
Class A
(Style D) IDC
Combo Waterflow
& Supervisory
20KΩ, ½ watt ELR
resistor P/N:75477
(supervised and
power-limited)
Tamper
Smoke
Tamper
Pull Station
Waterflow
Heat
B- B+ B- B+ B-
ZONE 3 ZONE 4
A+ A- A+ A-
A+
CLASS A CLASS A
ZONE 1 ZONE 2
ZONE 3
Installation of Optional Modules
Class A
(Style D) IDC
(supervised and
power-limited)
Dummy load all unused
circuits - 4.7 K Ω
½ watt ELR resistor
(P/N: 71245)
MS-4
Circuit Board
B+ B-
A- A+ A-
ZONE 4
MS-2/MS-4 PN 51512:D 10/18/04