Honeywell SD/355, SD/355T, SD/355R Addressale Photoelectric - Smoke Detectors


The MMF-301 monitor module can be installed in a single gang junction box directly behind the monitored unit. Its small size and light weight allow it to be installed without rigid mounting (see Figure 1). The MMF-301 is intended for use in intelligent, two-wire systems where the individual address of each module is selected using rotary switches. It provides a two-wire initiating circuit for normally open contact fire alarm and security devices.

Before installing

This information is included as a quick reference installation guide. Refer to the control panel installation manual for detailed system information. If the modules will be installed in an existing operational system, inform the operator and local authority that the system will be temporarily out of service. Disconnect power to the control panel before installing the modules.

Mounting and Wiring

NOTE: This module is intended to be wired and mounted without rigid connections inside a standard electrical box. All wiring must conform to applicable local codes, ordinances, and regulations.

1.Connect the red (+) and black (-) wires to the positive and negative loop power leads of the Signaling Line Circuit (SLC).

2.Connect the violet (+) and yellow (-) wires to a two-wire, normally open initiating loop.

3.Install the specified EOL resistor value to terminate the initiating loop.

4.Set the address on the module per job drawings.

5.Install the module in the desired mounting location.

Compatibility requirements

 To ensure proper operation, this module should only be connected to listed compatible system control panels only.

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 Nominal Operating Voltage 15 – 32 VDC 
 Average Operating Current 375 µA (group poll); 350 µA (direct poll); 600 µA Maximum (Communicating, IDC Shorted
 EOL resistance 47K ohms
 Maximum IDC Resistance 1,500 Ohms
 Maximum IDC Voltage 11 Volts
 Maximum IDC Current 450 µA
 Temperature Range 32˚F to 120˚ F (0˚C to 49˚ C)
 Humidity 10% to 93% Non-condensing
 Dimensions 1.3˝ H x 2.75˝ W x 0.65˝ D
 Wire length 6˝ minimum



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