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Product Description



 The Fire•Lite MS-4 and MS-4E Fire Alarm Control Panels(FACPs) bring the latest in microprocessor technology to conventionalfire controls.

The MS-4 is compatible with the i³™smoke detectors from System Sensor, with drift compensation,maintenance alert, and freeze warning. Automatic synchronizationof audio/visual devices with three selections for manufacturerprotocol. The Notification Appliance Circuit (NAC) protocolcan silence audible devices while strobes continue to flash,using a single pair of wires.The MS-4 is compatible with conventional input devices such astwo- and four-wire smoke detectors, pull stations, waterflowdevices, tamper switches and other normally-open contactdevices. Refer to the Fire•Lite Device Compatibility Documentfor a complete list of compatible devices.Note: Unless indicated otherwise, the term “MS-4” refers to bothMS-4 and MS-4E models.


• Four Style B (Class B) Initiating Device Circuits (IDCs).

• Two Style Y (Class B) NACs.

• Optional module that converts all four IDCs and two NACs toClass A operation.

• 24 VDC.

• i³™ Technology features:

– Drift compensation automatically adjusts detector sensitivityand increases resistance to false alarms caused by dustaccumulation.

– Maintenance Alert LEDs (per zone) warn of excessive dirtaccumulation, preventing false alarms (meets NFPA 72requirements).

– Detector sensitivity is automatically measured by thedetector, which automatically adjusts its sensitivity back tothe factory settings when it becomes more sensitive due tocontaminants settling in the chamber.

– Wireless handheld sensitivity meter eliminates the need forvoltmeters, magnets, and a physical connection to thedetector. The reader displays sensitivity in terms of percentper foot obscuration and provides text status indication.

– Supervisory LED (per zone) provides warning if a detectorsenses temperature approaching freezing.

– Special test protocol and LED indication allows quick test ofall detectors without need for a ladder.

• NAC synchronization features:

– Synchronization of standard ANSI audible signals asrequired by NFPA 72.

– Synchronization of ADA compliant strobes per NFPA 72.

– Selectable for System Sensor, Wheelock, and Gentexprotocols.

– Selective Silence feature for manual silence of hornswhile strobes continue to flash on the same NAC.

– Alarm verification selectable for each zone.

– Disable switches provided per zone.

• NACs programmable for:

– Silence Inhibit

– Auto Silence

– Strobe Synchronization

– Selective Silence (horn-strobe mute)

– Temporal or Steady signal

– Silenceable or Nonsilenceable

• Silent or audible Walk Test operation mode commanded fromthe front keypad, with automatic return-to-normal after onehour of inactivity.

• Each zone may be programmed for supervisory or fire; eachzone has separate red and yellow LEDs.

• Zone 4 is programmable for combination of tamper supervisorymonitoring and waterflow alarm.

• Form-C Alarm, Trouble, and Supervisory relays.

• 3.0 A total usable current.

• 6.0 A total usable current available with optional secondtransformer.

• Control buttons:

– ACK (Acknowledge)

– Alarm Silence

– Reset

– Walk Test

– Zone Enable/Disable (one per zone)

• LED indicators:

– Fire Alarm (one per zone)

– Supervisory (one per zone)

– Trouble (one per zone)

– Maintenance (one per zone)

– AC Power

– NAC Disable

– Zone Disable

– NAC Fault

– System Trouble

– Power Trouble

– Walk Test

– Alarm Silence

– Earth Fault (on circuit board)

– Battery Fault (on circuit board)

– Charger Fault (on circuit board)

• Piezo sounder for alarm, trouble, supervisory and maintenance.

• Optional plug-in 4XTMF transmitter module.

• Optional plug-in 4XZMF zone relay module.

• Optional 4XLMF transmitter module for RZA-4XF remoteLED annunciator.

• Optional dress panel.


Activation of a compatible smoke detector or any normally-openfire alarm initiating device activates audible and visual signalingdevices, illuminates an indicating LED, sounds the piezosounder at the FACP, activates the FACP alarm relay and operatesan optional module used to notify a remote station or initiatean auxiliary control function.



• MS-4: 120 VAC, 50/60 Hz, 2.3 A.

• MS-4E: 240 VAC, 50 Hz, 1.15 A.

• Wire Size: Minimum 14 AWG (2.0 mm²) with 600 V insulation.


• Maximum charging circuit: normal flat charge 27.6 VCD @0.8 A.

• Maximum battery charger capacity: 18.0 AH battery (two7.0 AH batteries can be housed in the FACP cabinet. Largerbatteries require a separate battery box such as the Fire•LiteBB-17F).


• Alarm zones 1 - 4.

• Power-limited circuitry.

• Operation: all zones Style B (Class B).

• Normal operating voltage: nominal 20 VDC.

• Alarm current: 15 mA minimum.

• Short-circuit current: 40 mA maximum.

• Maximum loop resistance: 100 ohms.

• End-of-line resistor: 4.7K ohm, ½ watt (P/N 71252).

• Standby current: 4 mA.

• Compatible devices: refer to the Fire•Lite Device CompatibilityDocument PN 15384 for a complete list of compatibledevices.


• Two NACs.• Power-limited circuitry.

• Normal operating voltage: nominal 24 VDC.

• Maximum signalling current: 2.5 A total with standard transformer5.0 A total (2.5 A maximum per NAC) with optionaltransformer.

• End-of-line resistor: 4.7K ohm, ½ watt (P/N 71252).

• Compatible devices: refer to the Fire•Lite Device CompatibilityDocument PN 15384 for a complete list of compatibledevices.


• Trouble Relay TB5 (fail-safe).

• Alarm Relay TB6.

• Supervisory relay TB7.

• Relay contact ratings: 2.0 A @ 30 VDC (resistive).


• Operating voltage: nominal 24 VDC.

• Maximum available current: 500 mA — appropriate for poweringfour-wire smoke detectors (see notes).

• Power-limited circuitry.

Notes: 1) Refer to the Fire•Lite Device Compatibility Documentfor a complete list of compatible devices.2) Total current for nonresettable power, resettable power andtwo NACs must not exceed 6.0 A for the MS-4 (required optionalsecond transformer).


Door: 15.342” (38.97 cm) high x 14.667” (37.28 cm) wide x0.375” (0.95 cm) deep.

Backbox: 15.0” (38.10 cm) high x 14.5” (36.83 cm) wide x 3.0”(7.62 cm) deep.


The cabinet can be surface mounted. The door is removableduring installation by opening and lifting it off the hinges. Thecabinet mounts using two key slots at the top of the backbox andtwo additional 0.25” diameter holes at the bottom.

Listings and Approvals

• UL Listed: S624

• MEA: 297-01-E

• CSFM: 7165-0075:200

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