Fire-Lite MS-4E Fire Alarm Control Panel - Manual (Page 38)

38 MS-2 & MS-4 Series Manual — P/N 51512:G2 10/18/2011
Program Options via DIP Switch DIP Switch Settings
NAC2 Disable (MS-4 only)
Switch 4 only on the MS-4, placed in the ON position, will disable NAC #2, preventing the notifi-
cation appliances from activating. This feature may be used during maintenance or while testing
the system to prevent building evacuation. The FACP will indicate an NAC disabled fault and sys-
tem trouble while this feature is selected. The factory default setting is switch 4 OFF for NAC2
enabled.
Strobe Synchronization
Switches 5 and 6 are used to program the Synchronization feature. This feature controls the activa-
tion of notification appliances in such a way that all devices will turn on and off at exactly the same
time, This is particularly critical when activating strobes which must be synchronized to avoid ran-
dom activation and a potential hazard or confusion. The FACP can be programmed to operate with
a variety of manufacturer’s devices. The following table lists the required switch settings to
accomplish synchronization:
The factory default setting is switches 5 and 6 OFF for No Synchronization.
 Maximum Number of Strobes for Synchronization
The total current draw for each Notification Appliance Circuit cannot exceed 2.5 amps. Refer to the
manufacturer’s documentation supplied with the strobes to determine the maximum current draw
for each strobe and ensure that the circuit maximum is not exceeded.
To ensure proper strobe and circuit operation, there is also a limit to the number of strobes that can
be attached to each circuit. Following is a list of the strobes that have been tested with this FACP
and the maximum number that can be connected to each NAC. Make sure that the NAC maximum
current is not exceeded:
 System Sensor: 40 Strobes
 Wheelock: 25 Strobes
 Gentex: 23 Strobes
Nonsilenceable Waterflow for Combination Circuit
If SW1 switch 8 is set to the ON position to select a Combination Waterflow/Supervisory Circuit
(refer to“IDC Combination Circuit” on page 36) and SW3 switch 7 is set to the ON position to
select the Nonsilenceable Waterflow for the Combination Circuit option, the following conditions
will occur:
• MS-2 - NACs become nonsilenceable upon acitvation of IDC #1 (Combination Circuit)
• MS-4 - NACs become nonsilenceable upon activation of IDC #2 (Combination Circuit)
Notes:
1. If initial alarm activations are from IDCs other than the Combination Circuit, the NACs will be
either silenceable or nonsilenceable, depending on the setting of SW3 switches 1 and 3 (refer
to “NAC1 Nonsilenceable” on page 37 and “NAC2 Nonsilenceable (MS-4 only)” on page 37).
2. If alarm activation is from the Combination Circuit programmed for nonsilenceable, all NACs
will be nonsilenceable regardless of subsequent IDC activations.
Spares
Switch 8 is a spare switch and has no function at this time. The switch should therefore be left in
the factory default setting of OFF.
Synchronization Feature Switch 5 Switch 6
No Synchronization OFF OFF
System Sensor Synchronization ON OFF
Gentex Synchronization OFF ON
Wheelock Synchronization ON ON