Installation Output Circuits
22 MS-2/MS-4 PN 51512:E 01/18/05
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.
TB2
B+ B- B+ B-
NAC 1 NAC 2
Figure 2.6 NAC Connections
Class B Notification Appliance Circuits (supervised and power-limited)
4.7 KΩ, ½ watt resistor P/N:71252
Dummy load any unused
circuits (P/N: 71245)
Polarized Bell
Polarized Strobe
Polarized Horn
Polarized Horn
Polarized Horn-Strobe
Polarized Bell
Notification Appliance Circuit
polarity shown in alarm condition
ms-4nac.cdr
