WFDN Series water flow detectors are compatible with schedule 7 through 40 steel pipe, for sizes 2 IN through 4 IN and compatible with schedule 10 through 40 steel pipe, sizes 5 through 8 IN, and can be mounted in a vertical or horizontal position. WFDN Series water flow detectors consist of a rugged, NEMA 4 rated enclosure that is more damage resistant than previous metal designs. The water flow detector is designed for both indoor and outdoor use, with the widest available temperature range, from 32 to 150 DEG F. They are also approved for installation on the widest range of pipe schedules, sizes 2 IN through 4 IN are approved for installation on pipe schedules 7 through 40.UL-listed models are equipped with tamper-resistant cover screws to prevent unauthorized entry. Inside, two sets of SPDT (Form C) synchronized switches are enclosed in a durable terminal block with new layout designed to make wiring easy with wire ready terminals, COM terminals are on a different elevation, large barrier between switches and easy to read raised textured lettering all make wiring easy. An optional cover tamper switch is available, securely snaps into place, no tools required. WFDN detectors incorporate a mechanical time delay feature, which minimizes the risk of false alarm due to pressure surges or air trapped in the fire sprinkler system. The larger and easy-to-turn timer dial makes setting the water flow detector easy with high contrast pad printed markings. The dial offers three tabs to help with turning, with one larger tab located on the dial position for approximately 60 seconds, a notch is also indicated on the dial to locate approximately 30 seconds making setting the detector in dimly lit locations easy. The WFDN series is designed for accuracy and repeatability. The detector also offers improved performance during vibration in riser applications where detectors are exposed to a large in rush of water.

• New directional cover allows installers and inspectors to easily see the direction of flow
• UL-listed models are NEMA 4 rated; New cover provides a better seal, is lighter weight, not painted and corrosion-resistant
• Less exposed metal reduces shock hazard, plastic cover acts as insulator and is resistant to arcing
• Visual switch activation, audible switch activation (73 DBA)
• Field-replaceable timer/switch assembly
• Accommodates up to 12 AWG wire, wire-ready terminals, improved wiring with new terminal block layout
• Switch synchronization activates both alarm panel and local bell or horn strobe
• Tamper-resistant cover screws, snap-in optional cover tamper switch
• Improved water sealing, timer repeatability, and accuracy

• Brochure/Catalog https://macombstage.cimm2.com//ASSETS/DOCUMENTS/ITEMS/EN/WFD20N_Broc.pdf
• Instruction/Installation Manual https://macombstage.cimm2.com//ASSETS/DOCUMENTS/ITEMS/EN/WFD20N_Inst.pdf
• Specification Sheet https://macombstage.cimm2.com//ASSETS/DOCUMENTS/ITEMS/EN/SystemSensor_WFD20N_Specification_Sheet.pdf