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5.6 MMF-302 Wiring Diagrams

Following are wiring diagrams that concern NFPA Class B and Class A Initiating Device Circuits (IDCs) using MMF-302 Zone Inter face Modules.

5.6.1 Wiring a NFPA Class B IDC with an MMF-302

Connect the SLC wiring to the module terminals 1 (–) and 2 (+).

Each module takes one address on the SLC. Use the rotary switches on the module to set it to the required SLC address. Refer to “Setting 

an SLC address for a Single Point Module” on page 33.

The IDC is supervised and power limited to 230 microamperes @ 24 VDC.

The figure below shows typical wiring for a supervised and power-limited NFPA Class B IDC using an MMF-302 module.

• Refer to the Device Compatibility Document for compatible smoke detectors.

• 24 VDC power must be provided from a UL listed power supply for fire protection use. This power is inherently supervised by the

module.

• See “Power Considerations” on page 63 for information on 24 VDC power.

SLC

IDC

MMF-302

Two-wire 

smoke 

detectors

3.9K ELR

(supplied with module)

24 VDC Resettable power.

90 mA External 24 volt 

supply required 

Figure 5.15 Typical Class B IDC Wiring with an MMF-302

SLC-idcB2tpH.wmf

FireLite SLC Wiring Manual — P/N 51309:R3 7/29/2019 41

MMF-302 Wiring Diagrams Monitor Modules

5.6.2 Wiring a NFPA Class A IDC with an MMF-302

Connect the SLC wiring to the module terminals 1 (–) and 2 (+).

Each module takes one address on the SLC. Use the rotary switches on the module to set it to the required SLC address. Refer to “Setting 

an SLC address for a Single Point Module” on page 33.

The figure below shows typical wiring for a supervised and power-limited NFPA Class A IDC using an MMF-302 module. 

• Refer to the Device Compatibility Document for compatible smoke detectors.

• 24 VDC power must be provided from a UL listed power supply for fire protection use. This power is inherently supervised by the

module.

• See “Power Considerations” on page 63 for information on 24 VDC power.

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