DS1124 Revised: 10-Sep-2018
The following modules can be used when the NACs are synchronized:
•
SM-12/24 (Wheelock)
•
DSM-12/24 (Wheelock)
• SMD10-3A (Amseco)
Note: Refer to respective Module manuals about connection method, connectable NACs
Each addressable module, smoke sensor, heat detector and combination sensor/detector must have
the address set before connecting the device to the SLC loop. The address is set using the hand held
device programmer or the addressing feature on the control panel.
Before connecting a device to the SLC loop, take the following precautions to prevent potential damage
to SLC or device. Verify the following:
1. Power to the device is removed.
2. Field wiring is correctly installed.
3. Field wiring has no open or short circuits.
Document discrepancies and notify appropriate personnel.
When connecting the above-described module-to-module for NAC synchronization:
1. The interconnection between equipment shall be within a common enclosure.
2.
The circuit connections extended to additional fire alarm control unit equipment shall be made
within 20 feet (6.1m) of each other and be enclosed within conduit or equivalently protected
against mechanical injury.
When NACs are connected to MOM-4 module, each MOM-4 module shall be separated by short
circuit isolators (SCI) to avoid influence from a short-circuit of the SLC Signal Line Circuit.
Wiring Diagram
Setting the Address
Figure 2: Output Connected to a Notification Appliance Circuit
Page 2 of 4
SLC loop wiring (signal line circuit) is power limited. Power supply for terminals 24+ and 24- must
be power limited, so that the wiring for terminals A+, A- is power-limited. All terminals should be
wired in accordance with the requirements of NFPA 70 (NEC) and NFPA 72 (National Fire Alarm
Code). Failure to follow the wiring diagrams in the following pages will cause the system to not
operate as intended. For further information, refer to the control panel installation instructions.
There is a possibility that the relay in MOM-4 module has been accidentally set to “latched”
position during shipment. THE SIGNAL LINE CIRCUIT (SLC) MUST BE CONNECTED BEFORE
CONNECTING 24VDC. If power is applied to the terminals 24+ and 24- and the relay is latched,
a short circuit of wires connected to terminals A+, A- may damage the module. If this should
occur, the performance of the Addressable Module must be verified.
