Installation Of Optional Modules; 1: Cac-4 Class A Converter Module (Ms-4 Only); Installation; Wiring Nacs And Idcs For Class A - Fire-Lite MS-2 Instruction Manual

Installation of Optional Modules

2.6 Installation of Optional Modules
CAUTION:
!
REMOVE ALL POWER (AC AND DC) BEFORE INSTALLING OR REMOVING MODULES OR
WIRING.
2.6.1 CAC-4 Class A Converter Module (MS-4 only)

Installation

The CAC-4 Module can be used to convert the four Style B (Class B) Initiating Device Circuits to
Style D (Class A) and the two Style Y (Class B) Notification Appliance Circuits to Style Z (Class
A). The module plugs into connector J1 which is located at the top right of the MS-4 main circuit
board.
Install the three supplied standoffs in the holes on the main circuit board as indicated in the
following figure. Carefully align the connector on the CAC-4 with J1 on the FACP main circuit
board and press the module securely into place. Make certain the pins are properly aligned to
prevent bending or breaking of any connector pins.
Secure to Standoffs

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
MS-2 & MS-4 Series Manual — P/N 51512:G2 10/18/2011
DISCONNECT POWER
CAC-4 Module
J1 Connector
MS-4 Main Circuit Board
Figure 2.10 CAC-4 Module Installation
Installation
Secure to Standoff
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