Fire-Lite Alarms MS-424 User Manual

Initiating Device Connection (Typical)

Figure 3: Supervised Class B Operation

Notes:

1) Detection loop specifications
Operation: Class B
Voltage standby: 23VDC
Alarm current: 15mA
Short circuit current: 35mA±10mA
Supervision current: 5mA
End-of-line resistor: 4.7k, 5%
Maximum loop resistance: 200 ohms
Maximum detector current: 2.0mA/Zone

2) Smoke and ionization detectors requiring separate 24VDC can be powered from MCB-104 terminals 12 (+) & 13 (-). Use
end-of-line relay (SDLR-B) to supervise power circuit wiring.

3) Detector loop current is sufficient to ensure operation of one detector per zone.

4) Compatible, U.L. listed, 2-wire detectors available from Fire-Lite.

5) Initiating devices include: Manual stations, heat detectors, smoke detectors, ionization detectors, waterflow alarm devices,
coded manual stations.

6) Use mechanical water motor gong if waterflow alarm devices are connected to the zone.

7) Inhibit latching circuit by removing diode marked with a * from DZC-2 card if coded manual stations are connected.

8) Compatible, U.L. listed, 2-wire detector available from Fire-Lite, include the following series: CP101, CP204, CP311,
CP711, CP751, SD12T and SD32T.