3825 Ohio Avenue • St. Charles, IL 60174

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

©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

Electrical Connections

Ordering Information

UL Model No.

ULC/Canadian Model No.

Description

WFDTH

WFDTHA

Waterflow Detector, Fits 1˝, 1¼˝, 1½˝, 2˝ ferrous and brass threaded tees; 1˝, 1¼˝, 1½˝, 2˝ copper

sweat tees; 1˝ CPVC tees; and 1½˝ polybutylene tees

Accessories

A77-01-02

Replacement terminal block for WFDTH

S07-66002

Replacement tamper screws for covers of WFDTH

PRK9

Replacement paddle kit – 12 paddles for WFDTH (see

WFDTH for sizes included)

WFDW

Replacement tamper proof wrench for cover of

WFDTH

A3008-00

Replacement retard mechanism

C58-0009-000

Replacement metal cover

Spears® is a registered trademark of the Spears Manufacturing Company. Victaulic® is a registered trademark of the Victaulic Company of America.

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˝, 1¼˝,

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.

Delay Adjustment Dial

WFDT/WFDTH

BB

COM

COM

WFDT/WFDTH

BB

COM

COM

Typical FACP Connection

To nonsilenceable

initiating zone

of listed FACP

end-of-line

resistor

B

COM

To power

source

compatible

with bell

local

bell

WFDT, WFDTH

switch assembly

Typical Local Bell Connection

Break wire as shown for supervision

of connection. DO NOT allow

stripped wire leads to extend beyond

switch housing. DO NOT loop wires.

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.

CONTACT RATINGS

125/250 VAC

24 VDC

10 AMPS

2.5 AMPS

T16-0010-XXX

B

COM

A

CO

M

CO

M

SWITCH 1

SWITCH 2

•CAUTION•

ROUTE WIRING

AWAY FROM

SHARP EDGES

& COPONENTS

SWITCH SCHEMATIC

•READY• STATE

Delay

adjustment

dial

NOTE: Retard time may exceed 90 seconds.

Adjust and verify that time does not exceed 90 seconds.

45

TI

M

E

DE

LAY IN SECO

ND

S

M

BE

R

ON

DIAL IS APPR

OX

IM

A

Physical/Operating Specifications

Static Pressure Rating

250 PSI (max.)

Operating Temperature Range

32°F to 120°F (0°C to 49°C)

Maximum Surge

18 FPS

Enclosure Rating

UL listed for indoor use

Triggering Threshold

Bandwidth (Flow Rate)

4–10 GPM

Cover Tamper Switch

Canadian models only, factory installed

Overall Dimensions,

Installed

4.5˝ H × 3.55˝ W × 6.7˝ L

(11.4cm H × 9cm W × 17cm L)

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 @ 125/250 VAC

2.5 A @ 24 VDC

Shipping Weight

2.6 lbs. (1.2 kg.)

Compatible Tee

Fittings

Threaded ferrous and brass tees, copper

sweat tees, CPVC tees, and polybutylene tees

Warranty

3 years

Conduit Entrances

Two openings for ½˝ conduit.

U.S. Patent Numbers

3,845,259; 4,782,333; 5,213,205