wfdn series waterfow detector the new wfdn series waterfow detectors from system sensor consists of a rugged, nema 4-rated enclosure that is more damage resistant than previous metal designs. the waterfow detector is designed for both indoor and outdoor use, with the widest available temperature range, from 32f to 150f. 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. the wfdn series incorporates a mechanical time delay feature, which minimizes the risk of false alarm due to pressure surges or air trapped in the fre sprinkler system. the larger and easy to turn timer dial makes setting the waterfow 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 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. agency listings the system sensor wfdn series is 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 in. through 8 in., and can be mounted in a vertical or horizontal position. 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 ? 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 ? reduced product weight ? wire-ready terminals ? improved wiring with new terminal block layout ? snap-in optional cover tamper switch ? improved timer repeatability and accuracy 3051266 7770-1653:0231 s739
engineering specifcations vane-type waterfow detectors shall be installed on system piping as designated on the drawing and/or as specifed herein. detectors shall mount on any clear pipe span of the appropriate nominal size, either a vertical upfow or horizontal run, at least 6 in. from any fttings that may change water direction, fow rate, or pipe diameter or no closer than 24 in. 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 450 psi for 2 in. C 8 in. pipes. the detector shall respond to waterfow in the specifed direction after a preset time delay that is feld 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 fttings 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. waterflow detector specifications standard specifcations static pressure rating 450 psi operating temperature range 32f to 150f (0c to 66c) maximum surge 18 feet per second (fps) enclosure rating* nema 4 C suitable for indoor/outdoor use triggering threshold bandwidth (flow rate) 4C10 gpm cover tamper switch standard with ulc models, optional for ul models, part no. cts conduit entrances two openings for ? in. conduit. nema 4 rated plugs service use 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 contact ratings two sets of spdt (form c) 10.0 a, ? hp @ 125/250 vac 2.5 a @ 6/12/24 vdc warranty 3 years compatible pipe steel water pipe, schedule 7 through 40* wfdn field wiring diagram 8.9 cm (3.5") 6.6 cm (2.6") pipe diame ter pl us 12.7 cm (5") pipe v ane overall wid th = pipe diame ter + 6.4 cm (2.5") u-bol t nut pipe saddle u-bol t pipe overall dimensions, installed 3825 ohio avenue ? st. charles, il 60174 phone: 800-sensor2 ? fax: 630-377-6495 www.systemsensor.com ?2016 system sensor. product specifcations subject to change without notice. visit systemsensor.com for current product information, including the latest version of this data sheet. wfds87903 ? 11/16 ordering information ul model ulc model pipe size hole size shipping weights wfd20n wfd20na 2 in. 1? in. 2.6 lbs. wfd25n wfd25na 2? in. 1? in. 2.6 lbs. wfd30n wfd30na 3 in. 2 in. 3.1 lbs. wfd40n wfd40na 4 in. 2 in. 4.0 lbs. wfd50n wfd50na 5 in. 2 in. 4.9 lbs. wfd60n wfd60na 6 in. 2 in. 5.6 lbs. wfd80n WFD80NA 8 in. 2 in. 7.3 lbs. accessories fs-rt delay mechanism and switch assembly cts tamper-proof switch kit wfdw tamper-proof wrench for cover * 2 in. - 4 in. rated for use with schedule 7 through 40 pipe, 6 in. - 8 in. rated for use with schedule 10 through 40 pipe.
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