System Sensor FM UL Waterflow Detector Water Flow Switch

General     Description

Model shall be WFDTN or WFDTNRN as manufactured by System Sensor. T-Tap waterfl ow 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 specifi ed herein. Detectors shall mount on any clear pipe span of the appropriate nominal size, either a vertical upfl ow or horizontal run at least 6" from any fi ttings 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 waterfl ow in the specifi ed direction after a preset time delay that is fi eld 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 fi ttings 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.

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