Functional Devices RIBMNLB-4 Board 322838-754 188" inner diameter (ID) ensures

188" inner diameter (ID) ensures a secure fit on standard 1-3/16" shafts

Adjustments are made via the internal range and differential screws

while the integrated check valve makes it fully compatible with heat pump systems

ensuring stable combustion and reliable ignition in residential and commercial boilers

Functional Devices RIBMNLB-4 Board 322838-754 188" inner diameter (ID) ensuresThe 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) inputstypically from smoke detectors, freeze stats,