Installation
MS-9050UD PN 52413:C 01/23/08 45
2.5.1 Configuring NACs
The Notification Appliance Circuits are configured for Style Y (Class B) or Style Z (Class A) by
properly wiring the NAC devices to TB1 on the main circuit board as illustrated below.
Figure 2.6 NAC Wiring
Style Y (Class B) Notification Appliance
Circuits, supervised and power-limited -
4.7 kΩ, ½ watt P/N:71252 UL listed
Polarized Bells
Polarized HornsPolarized Horns
Polarized Strobes
Notification Appliance Circuit
polarity shown in alarm state
Dummy Load all unused circuits
with a 4.7 kΩ, ½ watt resistor
across the B+ & B- terminals or
wire jumpers between A+ & B+
and A- & B-.
9050udnac.cdr
Polarized Strobes
terminal number
NAC 1 NAC 2
Style Z (Class A) Notification Appliance
Circuits, supervised and power-limited
Polarized Bells
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