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.

Waterflow Detector Specifications

Standard Specifications

Static Pressure Rating

375 PSI

Operating Temperature Range

32°F to 150°F (0°C to 60°C)

Maximum Surge

18 Feet Per Second (FPS)

Enclosure Rating*

NEMA 4 – suitable for indoor/outdoor use

Triggering Threshold

Bandwidth (Flow Rate)

4–10 GPM

Cover Tamper Switch

Standard with ULC models, optional for

UL models, part no. CTS

Conduit Entrances

Two openings for ½in. 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, ½ HP @ 125/250 VAC

2.5 A @ 6/12/24 VDC

U.S. Patent Numbers

5,213,205

Compatible Tee Fittings

Threaded ferrous and brass tees,

copper sweat tees, CPVC tees.

Warranty

3 Years

WFDTN Field Wiring Diagram

Overall Dimensions, Installed

3-1/2"

2-5/8"

4"

TEE DEPTH

DESIGNED TO FIT WITHIN 2 X 4 STUD WALL CONSTRUCTION

PLASTIC VANE

TEE FITTING

INSTALLATION GAUGE

END OF PADDLE TREE MUST

FIT BETWEEN TOP OF TEE

AND BOTTOM OF FLANGE

TEE

ADAPTER

3825 Ohio Avenue • St. Charles, IL 60174

Phone: 800-SENSOR2 • Fax: 630-377-6495

www.systemsensor.com

©2016 System Sensor.

Product specifications subject to change without notice. Visit systemsensor.com

for current product information, including the latest version of this data sheet.

WFDS88003 • 11/16

Ordering Information

UL Model

ULC Model

Description

WFDTN

WFDTNA

Waterflow Detector, Fits 1in., 1¼in., 1½in., 2in. ferrous and brass threaded tees;

1in., 1¼in., 1½in., 2in. copper sweat tees; 1in. CPVC tees.

WFDTNRN

—

Waterflow Detector without incorporated time delay mechanism,

fits same tees as WFDTN

Accessories

FS-RT

Delay mechanism and switch assembly

CTS

Tamper-proof switch kit

WFDW

Tamper-proof wrench for cover