SilentKnight SK-4 Conventional FACP 2 & 4 Zone - Manual (Page 22)

22 SK-2 & SK-4 Series Manual — P/N 52604:B 9/14/2010
Installation Output Circuits
2.4 Output Circuits
2.4.1 Notification Appliance Circuits
The SK-2 provides one Style Y (Class B) NAC (Notification Appliance Circuit) while the SK-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 SK-2 or 6.0 amps for the SK-4 with the optional second transformer installed
(refer to battery calculations section). Each circuit is supervised and power-limited. Refer to the
Silent Knight Device Compatibility Document for a listing of compatible notification appliances.
The SK-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 (SK-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 K , 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
m
s-4n
a
c.
w
m
f