Output Circuits; 1: Notification Appliance Circuits - Fire-Lite MS-2 Instruction Manual

Installation

2.4 Output Circuits

2.4.1 Notification Appliance Circuits
The MS-2 provides one Style Y (Class B) NAC (Notification Appliance Circuit) while the MS-4
provides two Style Y (Class B) NACs. Each circuit is capable of providing a maximum of 2.5
amps of current. Total current drawn from these as well as other DC power outputs cannot exceed
3.0 amps for the MS-2 or 6.0 amps for the MS-4 with the optional second transformer installed
(refer to battery calculations section). Each circuit is supervised and power-limited. Refer to the
Fire•Lite Device Compatibility Document for a listing of compatible notification appliances.
The MS-4 NACs can be converted to Style Z (Class A) by installing the optional Class A Converter
module. Refer to "CAC-4 Class A Converter Module (MS-4 only)" on page 25.
Notification Appliance Circuit
polarity shown in alarm condition
22
Class B Notification Appliance Circuits (supervised and power-limited)
4.7 K, ½ watt resistor P/N:71252
Polarized Bell
Polarized Strobe
Polarized Horn
B+ B-
NAC 1
Figure 2.6 NAC Connections
Polarized Bell
Polarized Horn-Strobe
Polarized Horn
Dummy load any unused
circuits (P/N: 71245)
B+ B-
NAC 2
MS-2 & MS-4 Series Manual — P/N 51512:G2 10/18/2011
Output Circuits