Functional Devices RIBMNLB-4 Board
The Functional Devices RIBMNLB-4 logic board is a field-proven AHU fan safety alarm circuit designed to aggregate multiple shutdown signals into a single supervisory point. This 4-input logic module eliminates the need for complex, hand-wired relay interlocking by using high-density 2.75-inch track mount housing. Optimized for 24Vac/dc power input, the board accepts up to four normally-closed (N/C) inputs—typically from smoke detectors, freeze stats, and high-pressure switches—to control a master relay. If any single input opens, the master alarm relay triggers a system shutdown, while individual red LED status indicators provide immediate visual diagnostics to identify the specific fault source. A common application involves using the isolated dry contact output (rated at 10 Amps) to interrupt the fan starter circuit while simultaneously providing 24V status signals to a DDC controller. This half-wave device is UL listed for safety and plenum applications, ensuring a robust interface for building automation systems (BAS) and critical HVAC safety circuits.
Key Benefits- Simplified Wiring: Replaces bulky relay logic with a compact track mount logic board featuring screw terminal connections for fast installation.
- Enhanced Diagnostics: Integrated LED status indicators for each input and the master relay allow technicians to troubleshoot HVAC alarm circuits without a multimeter.
- Flexible Integration: Includes bypass DIP switches for each input, allowing for easy system expansion or temporary maintenance masking of unused ports.
- High Power Capacity: Features a 10 Amp SPDT master relay and dedicated 24V outputs compatible with damper actuators and fan starters.
Can I use normally-open (N/O) sensors with the RIBMNLB-4?
No, this specific model is designed for N/C (normally-closed) alarm inputs. For N/O applications, the RIBMNLB-4NO series should be utilized to ensure proper fail-safe logic.
Is the board compatible with full-wave rectified power supplies?
The RIBMNLB-4 is a half-wave device. Care must be taken when sharing a 24Vac transformer with full-wave devices to prevent potential grounding issues or equipment damage.
What mounting options are available?
This unit comes with a 4-inch MT212-4 mounting track for installation inside existing electrical enclosures, keeping the HVAC control board secure and accessible.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $105.66
-65%$105.66
$36.98Functional Devices RIBMNLB-4 Board
The Functional Devices RIBMNLB-4 logic board is a field-proven AHU fan safety alarm circuit designed to aggregate multiple shutdown signals into a single supervisory point. This 4-input logic module eliminates the need for complex, hand-wired relay interlocking by using high-density 2.75-inch track mount housing. Optimized for 24Vac/dc power input, the board accepts up to four normally-closed (N/C) inputs—typically from smoke detectors, freeze stats, and high-pressure switches—to control a master relay. If any single input opens, the master alarm relay triggers a system shutdown, while individual red LED status indicators provide immediate visual diagnostics to identify the specific fault source. A common application involves using the isolated dry contact output (rated at 10 Amps) to interrupt the fan starter circuit while simultaneously providing 24V status signals to a DDC controller. This half-wave device is UL listed for safety and plenum applications, ensuring a robust interface for building automation systems (BAS) and critical HVAC safety circuits.
Key Benefits- Simplified Wiring: Replaces bulky relay logic with a compact track mount logic board featuring screw terminal connections for fast installation.
- Enhanced Diagnostics: Integrated LED status indicators for each input and the master relay allow technicians to troubleshoot HVAC alarm circuits without a multimeter.
- Flexible Integration: Includes bypass DIP switches for each input, allowing for easy system expansion or temporary maintenance masking of unused ports.
- High Power Capacity: Features a 10 Amp SPDT master relay and dedicated 24V outputs compatible with damper actuators and fan starters.
Can I use normally-open (N/O) sensors with the RIBMNLB-4?
No, this specific model is designed for N/C (normally-closed) alarm inputs. For N/O applications, the RIBMNLB-4NO series should be utilized to ensure proper fail-safe logic.
Is the board compatible with full-wave rectified power supplies?
The RIBMNLB-4 is a half-wave device. Care must be taken when sharing a 24Vac transformer with full-wave devices to prevent potential grounding issues or equipment damage.
What mounting options are available?
This unit comes with a 4-inch MT212-4 mounting track for installation inside existing electrical enclosures, keeping the HVAC control board secure and accessible.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Functional Devices RIBMNLB-4 logic board is a field-proven AHU fan safety alarm circuit designed to aggregate multiple shutdown signals into a single supervisory point. This 4-input logic module eliminates the need for complex, hand-wired relay interlocking by using high-density 2.75-inch track mount housing. Optimized for 24Vac/dc power input, the board accepts up to four normally-closed (N/C) inputs—typically from smoke detectors, freeze stats, and high-pressure switches—to control a master relay. If any single input opens, the master alarm relay triggers a system shutdown, while individual red LED status indicators provide immediate visual diagnostics to identify the specific fault source. A common application involves using the isolated dry contact output (rated at 10 Amps) to interrupt the fan starter circuit while simultaneously providing 24V status signals to a DDC controller. This half-wave device is UL listed for safety and plenum applications, ensuring a robust interface for building automation systems (BAS) and critical HVAC safety circuits.
Key Benefits- Simplified Wiring: Replaces bulky relay logic with a compact track mount logic board featuring screw terminal connections for fast installation.
- Enhanced Diagnostics: Integrated LED status indicators for each input and the master relay allow technicians to troubleshoot HVAC alarm circuits without a multimeter.
- Flexible Integration: Includes bypass DIP switches for each input, allowing for easy system expansion or temporary maintenance masking of unused ports.
- High Power Capacity: Features a 10 Amp SPDT master relay and dedicated 24V outputs compatible with damper actuators and fan starters.
Can I use normally-open (N/O) sensors with the RIBMNLB-4?
No, this specific model is designed for N/C (normally-closed) alarm inputs. For N/O applications, the RIBMNLB-4NO series should be utilized to ensure proper fail-safe logic.
Is the board compatible with full-wave rectified power supplies?
The RIBMNLB-4 is a half-wave device. Care must be taken when sharing a 24Vac transformer with full-wave devices to prevent potential grounding issues or equipment damage.
What mounting options are available?
This unit comes with a 4-inch MT212-4 mounting track for installation inside existing electrical enclosures, keeping the HVAC control board secure and accessible.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
