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WFDTH Waterflow Detector
The System Sensor WFDTH Retard T-Tap Waterflow Detector is designed for primary signaling in residential systems and fits within 2x4 stud wall construction.
Features
* Residential sprinkler systems * Sealed retard mechanism * Visual switch activation * Rugged, dual SPDT switches enclosed in a durable terminal block * Easy to install and maintain design * Vertical or horizontal mount * Field replaceable retard mechanism and switch assembly * Twelve different flexible paddles * Durable, tamper resistant enclosure * Two conduit openings * Handy depth gauge * Accommodates up to 12 AWG wire * 100% synchronization fires alarm panel and local bell simultaneously
The WFDTH fits any tee that has a 1 NPT branch, including: 1, 11/4, 11/2, and 2 NPT threaded ferrous and brass tees; 1, 11/4, 11/2 and 2 copper sweat tees; Central, Spears(R), and Victaulic(R) brand 1 CPVC tees; and 11/2 polybutylene tees. Design. The design of the WFDTH makes it easy to install and simple to maintain. It can be mounted in the vertical or horizontal position. Two conduit openings permit easy attachment to the local alarm system. The retard mechanism and switch assembly are fieldreplaceable. Features. Twelve different flexible paddles fit 1, 11/4, 11/2, and 2 tees. Sizes are marked clearly on the paddle for ease of installation. Plastic paddles slip over the actuating lever and are securely fastened with one screw. The handy depth gauge insures the proper installation depth and clearance of the detector to the tee. Construction. The WFDTH includes a durable and tamper resistant enclosure. Its sealed retard assures that the delay mechanism is not contaminated by dust and dirt when the cover is removed. The long lasting cover completely encloses the electrical components to further keep out dust and dirt. Improved self-guiding security screws and removal tools make detectors resistant to tampering and simplify field maintenance.
Agency Listings
S739
CS169
7770-1653:114
167-93-E
WFDTH Specifications
Architectural/Engineering Specifications Model shall be a WFDTH as manufactured by System Sensor. T-tap waterflow detectors shall be installed on a tee that has a 1 NPT branch including: 1, 11/4, 11/2, or 2 threaded ferrous or brass tee; 1-2 copper sweat tees; Central, Spears(R), and Victaulic(R) brand 1 CPVC tees; or 11/2 polybutylene tee as designated on the drawings and/or as specified herein. Detectors shall mount on any clear pipe span of the appropriate size, either a vertical or horizontal run at least 6 from any fittings or valves which may change water direction, flow rate, or pipe diameter or no closer than 24 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 250 psi. The retard t-tap detector shall be a sealed mechanical pneumatic unit with visual indication of actuation. The actuation mechanism shall include a polyethylene vane inserted through the tee fitting and connected by a mechanical linkage to the delay mechanism. Outputs shall consist of dual SPDT switches (Form C contacts). Two conduit entrances (one of which is a knockout type) for standard fittings of commonly used electrical conduit shall be provided on the detectors. A grounding provision is provided. WFDTH is listed by Underwriters Laboratories for indoor use. Physical/Operating Specifications Static Pressure Rating 250 PSI (max.) Maximum Surge 18 FPS Triggering Threshold 4-10 GPM Bandwidth (Flow Rate) Overall Dimensions, 4.5 H x 3.55 W x 6.7 L Installed (11.4cm H x 9cm W x 17cm L) Operating Temperature Range 32F to 120F (0C to 49C) Enclosure Rating UL listed for indoor use Cover Tamper Switch Canadian models only, factory installed 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 2.6 lbs. (1.2 kg.)
Contact Ratings
Compatible Tee Fittings Conduit Entrances
Two sets of SPDT (Form C) Shipping Weight 10.0 A @ 125/250 VAC 2.5 A @ 24 VDC Threaded ferrous and brass tees, copper Warranty sweat tees, CPVC tees, and polybutylene tees Two openings for 1/2 conduit. U.S. Patent Numbers
3 years 3,845,259; 4,782,333; 5,213,205
Electrical Connections
T16-0010-XXX B COM *CAUTION* ROUTE WIRING AWAY FROM SHARP EDGES & COPONENTS A
Delay Adjustment Dial
CONTACT RATINGS 125/250 VAC 10 AMPS 24 VDC 2.5 AMPS
0 Delay adjustment dial
NU
SWITCH 1
SWITCH 2
WFDT/WFDTH
B B
WFDT/WFDTH
B B
45
To nonsilenceable initiating zone of listed FACP
end-of-line resistor
COM COM COM COM
NOTE: Retard time may exceed 90 seconds. Adjust and verify that time does not exceed 90 seconds.
Typical FACP Connection
To power source compatible with bell
B
Break wire as shown for supervision of connection. DO NOT allow stripped wire leads to extend beyond switch housing. DO NOT loop wires. Typical Local Bell Connection WFDT, WFDTH switch assembly
COM
local bell
Ordering Information
UL Model No. WFDTH Accessories A77-01-02 PRK9 A3008-00 ULC/Canadian Model No. WFDTHA Description Waterflow Detector, Fits 1, 11/4, 11/2, 2 ferrous and brass threaded tees; 1, 11/4, 11/2, 2 copper sweat tees; 1 CPVC tees; and 11/2 polybutylene tees S07-66002 WFDW C58-0009-000 Replacement tamper screws for covers of WFDTH Replacement tamper proof wrench for cover of WFDTH Replacement metal cover
Replacement terminal block for WFDTH Replacement paddle kit - 12 paddles for WFDTH (see WFDTH for sizes included) Replacement retard mechanism
Spears(R) is a registered trademark of the Spears Manufacturing Company. Victaulic(R) is a registered trademark of the Victaulic Company of America.
3825 Ohio Avenue * St. Charles, IL 60174 Phone: 800-SENSOR2 * Fax: 630-377-6495
(c)2007 System Sensor. Product specifications subject to change without notice. Visit systemsensor.com for current product information, including the latest version of this data sheet. A05-0941-007 * 4/07 * #1676
55
70
CO
M
SWITCH SCHEMATIC *READY* STATE
M CO
NOTE: Common and B connections will close when vane is deflected, i.e., when water is flowing. Dual switches permit applications to be combined on a single detector.
DIAL IS APP R ON R DELAY IN SECO OXI ND MA BE M IME S T
TE
15 30

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