FireLite MMF-302 Interface Module

The MMF-302 Interface Module is intended for use in intelligent, addressable systems, where the individual address of each module is selected using built-in rotary switches. This module allows intelligent panels to interface and monitor twowire conventional smoke detectors. It transmits the status (normal, open, or alarm) of one full zone of conventional detectors back to the control panel. All two-wire detectors being monitored must be UL compatible with the module. The MMF-302 has a panel-controlled LED indicator and can be used to replace M302 modules in existing systems.

• Supports compatible two-wire smoke detectors.
• Supervises IDC wiring and connection of external power source.
• High noise (EMF/RFI) immunity.
• SEMS screws with clamping plates for ease of wiring.
• Direct-dial entry of address: 01 – 159 on LiteSpeed systems, 01 – 99 on CLIP systems.
• LED flashes during normal operation (this is a programmable option).
• LED latches steady to indicate alarm on command from control panel.

MMF-302 Applications
Use the MMF-302 to monitor a zone of two-wire smoke detectors. The monitored circuit may be wired as an NFPA Style B (Class B) or Style D (Class A) Initiating Device Circuit. A 3.9 K ohm End-of-Line Resistor (provided) terminates the end of the Style B or D (class B or A) circuit (maximum IDC loop resistance is 25 ohms). Install ELR across terminals 8 and 9 for Style D application.

MMF-302 Operation
Each MMF-302 uses one of 159 available module addresses on an SLC loop. It responds to regular polls from the control panel and reports its type and the status (open/normal/short) of its Initiating Device Circuit (IDC). A flashing LED indicates that the module is in communication with the control panel. The LED latches steady on alarm (subject to current limitations on the loop).

MMF-302 Specifications

• Nominal operating voltage: 15 to 32 VDC.
• Maximum current draw: 5.1 mA (LED on).
  Average operating current: 270 µ (LED flashing).
• EOL resistance: 3.9K ohms.
• External supply voltage (between Terminals T3 and T4):
  DC voltage: 18 to 28 volts power limited. Ripple voltage: 0.1
  Vrms maximum. Current: 90 mA per module maximum.
• Requires regulated, resettable 24 VDC power.
• Temperature range: 32ºF to 120ºF (0ºC to 49ºC).
• Humidity range: 10% to 93% noncondensing.
• Dimensions: 4.5" (11.43 cm) high x 4" (10.16 cm) wide x 1.25" (3.175 cm) deep. Mounts to a 4" (10.16 cm) square x 2.125" (5.398 cm) deep box.