Honeywell LEM-320 Loop Expansion Module

Applications

• Fire Alarm System Expansion: Adds an additional signaling loop to supported fire alarm control panel configurations.

• Commercial Buildings: Suitable for compatible fire alarm systems in offices, retail buildings, and commercial facilities.

• Industrial Facilities: Supports expansion of addressable fire detection systems in suitable industrial installations.

• Large Facility Monitoring: Helps accommodate additional compatible detectors and monitor/control modules when panel capacity and configuration permit.

• Fire and Life Safety Infrastructure: Supports the expansion of compatible addressable fire alarm systems as installation requirements evolve.

Advantages

• Additional SLC Capacity: Expands loop capability on supported fire alarm control panels.

• Plug-In Installation: The module's plug-in design simplifies installation within compatible panel assemblies.

• Long Loop Wiring Capability: Supported installations can provide loop wiring distances of up to 12,500 ft (3,810 m), depending on wiring type and loop configuration.

• Compact System Integration: Allows additional loop capacity without necessarily requiring a separate control panel.

• System Expansion Flexibility: Supports larger addressable installations when used within the limits of the compatible panel and system design.

Technical FAQs

Q1: What is the Honeywell LEM-320?

A: The LEM-320 is a Loop Expander Module used to add signaling line circuit capacity to compatible fire alarm control panels.

Q2: What is the main function of the LEM-320?

A: Its primary function is to expand loop capacity. For supported NFS-640/NFS2-640 panels, it enables expansion to a second loop; on supported NFS-3030/NFS2-3030 systems, it expands compatible loop control modules.

Q3: Which control panels support the LEM-320?

A: Documented compatible platforms include the NOTIFIER ONYX NFS-640, NFS2-640, NFS-3030, and NFS2-3030. Confirm compatibility with the exact panel version and system configuration before installation.

Q4: What is the nominal operating voltage?

A: The published specification lists 24 VDC nominal, with a maximum of 27.6 VDC.

Q5: What is the maximum loop wiring distance?

A: A supported SLC loop can reach up to 12,500 ft (3,810 m) using specified 12 AWG twisted-pair wiring. The allowable distance decreases with smaller wire sizes and depends on the wiring configuration.

Q6: What is the maximum current specification?

A: The published data lists 100 mA maximum for the LEM-320 module and 400 mA maximum for a single SLC loop. Check the applicable panel documentation for detailed operating limits.

Q7: Does the LEM-320 support addressable fire alarm devices?

A: It provides an SLC for compatible addressable devices. Supported device types and maximum device counts depend on the control panel, communication protocol, and system configuration.

Q8: Can the LEM-320 be installed in any fire alarm panel?

A: No. It is designed for specific compatible panel families and cannot be assumed to work with every Honeywell or third-party fire alarm system.

Q9: What should be checked before replacing an existing LEM-320?

A: Verify the module part number, control panel model, firmware or protocol requirements where applicable, wiring configuration, and relevant approval requirements.

Q10: Is the LEM-320 suitable for life safety installations?

A: It is a fire alarm system component. Installation, configuration, testing, and maintenance should follow the applicable manufacturer instructions, local codes, and requirements for qualified fire alarm personnel.