Fire-Lite MS-9050UDC Addressable Fire Alarm Control Panel - Manual (Page 30)

30 MS-9050 Series Manual — P/N 52413:G 4/14/2014
Installation Notification Appliance Circuits
2.5 Notification Appliance Circuits
The control panel provides two NACs (Notification Appliance Circuits) Style Y (Class B) or Style
Z (Class A). Each circuit is capable of 2.5 amps of current. Total current in alarm for all external
devices cannot exceed 2.5 amps (refer to “Calculating the System Current Draw” on page 154).
Use UL listed 24 VDC notification appliances only. Circuits are supervised and power-limited.
Refer to the Fire-Lite Device Compatibility Document for a listing of compatible notification appli-
ances. The NACs, which are located on the main circuit board, may be expanded via the Fire-Lite
FCPS Series field charger/power supplies.
NACs can also be configured for auxiliary power. If set for auxiliary power (door holder, resettable
power, non-resettable power) do not connect notification appliances. Refer to Section 1.2, “Speci-
fications” for power capability.
The following sections describe the configuration and wiring of Style Y and Style Z Notification
Appliance Circuits on the FACP main circuit board.
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.
TB1
B+ B- B- B+ A+ A- A+ A-
NAC1 NAC2
-
+
B
+
B
-
1 4
A
+
A
-
2 3
+
+
B
+
B
-
A
+
A
-
+
+
+
5 6 7 8
Figure 2.6 NAC Wiring
Style Y (Class B) Notification Appliance
Circuits, supervised and power-limited -
4.7 K
, ½ watt P/N:71252 UL listed
Polarized Bells
Polarized Horns Polarized Horns
Polarized Strobes
Notification Appliance Circuit
polarity shown in alarm state
Dummy Load all unused
circuits with a 4.7 K
, ½ watt
resistor across the B+ & B-
terminals or wire jumpers
between A+ & B+ and A- & B-.
90
50
ud
n
a
c
.wmf
Polarized Strobes
terminal number
NAC 1
NAC 2
Style Z (Class A) Notification Appliance
Circuits, supervised and power-limited
Polarized Bells