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Installation Installation of Optional Modules
26 MS-2/MS-4 PN 51512:E 01/18/05
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.
TB3
TB2
B+ B- B+ B-
NAC 1 NAC 2
B+ B- B+ B-
ZONE 1 ZONE 2
B+ B- B+ B-
ZONE 3 ZONE 4
TB1
A+ A- A+ A-
NAC 1 NAC 2
CLASS A CLASS A
A+ A- A+ A-
ZONE 1 ZONE 2
CLASS A CLASS A
A+ A- A+ A-
ZONE 3 ZONE 4
CLASS A CLASS A
Figure 2.11 Wiring NACs and IDCs for Class A Operation
CAC-4 Class A Converter Module
MS-4
Circuit Board
Class B (Style B)
IDC - 4.7 KΩ
½ watt ELR
resistor
P/N:71252
(supervised and
power-limited)
Dummy load all unused
circuits - 4.7 K
Ω
½ watt ELR 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)
Class A
(Style D) IDC
Combo Waterflow
& Supervisory
20KΩ, ½ watt ELR
resistor P/N:75477
(supervised and
power-limited)
1.2 K
Ω
½ watt
In-Line
resistor
P/N:75579
Polarized
Strobe
Polarized
Horn
Tamper
Tamper
Waterflow
Smoke
Smoke
Pull Station
Pull Station
Heat
Heat
IMPORTANT!
All devices must be
within 20 feet of the
Class A portion of
the circuit and
wiring must be in
conduit.
ms4comba.cdr