WFDTN Series Waterflow Detector System Sensor WFDTN T-Tap Waterflow detectors are designed for primary signaling in residential systems and branch line signaling. Features • 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 • Sealed retard mechanism immune to dust and other contaminants • Less exposed metal reduces shock hazard, plastic cover acts as insulator and is resistant to arcing • Visual switch activation The new WFDTN Series waterflow detectors from System Sensor consists of a rugged, NEMA 4-rated enclosure that is more damage resistant than previous metal designs. The waterflow detector is designed for both indoor and outdoor use, with the widest available temperature range, from 32°F to 150°F. Both the WFDTN with incorporated timer and WFDTNRN with immediate activation fit any tee that has a 1 in. NPT branch, including: 1in., 1¼in., 1½ in. and 2in. NPT threaded ferrous and brass tees; 1in., 1¼in., 1½in. and 2in. copper sweat tees; Tyco, Spears, NIBBCO brand 1 in. CPVC tees. Twelve different clearly marked plastic paddles are available to fit different installation configurations. • Audible switch activation (73 dBA) • Field-replaceable timer/switch assembly • Accommodates up to 12 AWG wire • Switch Synchronization activates both alarm panel and local bell or horn strobe • Tamper-resistant cover screws • Improved water sealing 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. • Reduced product weight • Wire-ready terminals • Improved wiring with new terminal block layout • Snap-in optional cover tamper switch Agency Listings S739 The WFDTN incorporates 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 waterflow 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 dimmly lit locations easy. The WFDTN 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. 30512266 Waterflow Detector Specifications Engineering Specifications Model shall be WFDTN or WFDTNRN as manufactured by System Sensor. T-Tap waterflow detectors shall be installed on a tee that has a 1in. NPT branch including: 1in., 1¼in., 1½in. and 2in. NPT threaded ferrous and brass tee; 1in., 1¼in., 1½in. and 2in. copper sweat tees; Tyco, Spears, NIBBCO brand 1in. CPVC tees as designed on the drawing and /or as specified herein. Detectors shall mount on any clear pipe span of the appropriate nominal size, either a vertical upflow or horizontal run at least 6˝ from any fittings or valves that may change water direction, flow rate, or pipe diameter or no closer than 24in. from a valve or drain. Detectors shall have a sensitivity in the range of 4 to 10 gallons per minute and a static pressure rating of 375 psi. The WFDTN detector with incorporated time delay mechanism shall respond to waterflow in the specified direction after a preset time delay that is field adjustable. The delay mechanism shall be a sealed mechanical pneumatic unit with visual and audible indication of actuation. The actuation mechanism shall include a ethylene vinyl acetate vane inserted through a hole in the pipe and connected by a mechanical linkage to the delay mechanism. Outputs shall consist of dual SPDT switches (Form C contacts). Two conduit entrances for standard fittings of commonly used electrical conduit shall be provided on the detectors. A grounding provision is provided. Unless noted, enclosures shall be NEMA 4 listed by Underwriters Laboratories Inc. All detectors shall be listed by Underwriters Laboratories Inc. for indoor or outdoor use. Standard Specifications Static Pressure Rating Maximum Surge Triggering Threshold Bandwidth (Flow Rate) Conduit Entrances Contact Ratings Compatible Tee Fittings 375 PSI 18 Feet Per Second (FPS) 4–10 GPM Operating Temperature Range Enclosure Rating* Cover Tamper Switch Two openings for ½in. conduit. One open, one knock-out type Service Use Two sets of SPDT (Form C) 10.0 A, ½ HP @ 125/250 VAC 2.5 A @ 6/12/24 VDC Threaded ferrous and brass tees, copper sweat tees, CPVC tees. U.S. Patent Numbers 32°F to 150°F (0°C to 60°C) NEMA 4 – suitable for indoor/outdoor use Standard with ULC models, optional for UL models, part no. CTS Automatic Sprinkler: NFPA-13 One or Two Family Dwelling: NFPA 13D Residential Occupancies up to 4 Stories: NFPA 13R National Fire Alarm Code: NFPA-72 5,213,205 Warranty 3 Years WFDTN Field Wiring Diagram SSM24-X SSV120-X UL-LISTED COMPATIBLE CONTROL PANEL POWER 24VDC OR 120VAC + NOTE: COMMON AND B-NO CONNECTIONS WILL CLOSE WHEN VANE IS DEFLECTED, I.E., WHEN WATER IS FLOWING. DUAL SWITCHES PERMIT APPLICATIONS TO BE COMBINED ON A SINGLE DETECTOR. – CONTACT RATINGS + INITIATING LOOP – SUGGESTED EOL RESISTOR 125/250 VAC 10 AMPS 24 VDC 2.5 AMPS SCHEMATIC OF INDIVIDUAL SWITCH IN “NO WATERFLOW’ CONDITION BREAK WIRE AS SHOWN FOR SUPERVISION OF CONNECTION. DO NOT ALLOW STRIPPED WIRE LEADS TO EXTEND BEYOND SWITCH HOUSING. DO NOT LOOP WIRES. A-NC COM B-NO Delay Adjustment Dial DELAY ADJUSTMENT DIAL NOTE: RETARD TIME MAY EXCEED 90 SECONDS. ADJUST AND VERIFY THAT TIME DOES NOT EXCEED 90 SECONDS. NUMBER ON DIAL IS APPROXIMATE TIME DELAY IN SECONDS Overall Dimensions, Installed 3-1/2" 2-5/8" 4" TEE ADAPTER INSTALLATION GAUGE TEE DEPTH END OF PADDLE TREE MUST FIT BETWEEN TOP OF TEE AND BOTTOM OF FLANGE TEE FITTING PLASTIC VANE DESIGNED TO FIT WITHIN 2 X 4 STUD WALL CONSTRUCTION Ordering Information Description UL Model WFDTN ULC Model WFDTNA WFDTNRN — Accessories FS-RT CTS WFDW Delay mechanism and switch assembly Tamper-proof switch kit Tamper-proof wrench for cover Waterflow Detector, Fits 1in., 1¼in., 1½in., 2in. ferrous and brass threaded tees; 1in., 1¼in., 1½in., 2in. copper sweat tees; 1in. CPVC tees. Waterflow Detector without incorporated time delay mechanism, fits same tees as WFDTN 3825 Ohio Avenue • St. Charles, IL 60174 Phone: 800-SENSOR2 • Fax: 630-377-6495 www.systemsensor.com ©2014 System Sensor. Product specifications subject to change without notice. Visit systemsensor.com for current product information, including the latest version of this data sheet. WFDS43702 • 7/14