T-Tap
Waterflow Detectors
System Sensor T-Tap Waterflow Detectors are designed
for primary signaling in residential systems and branch
line signaling in larger systems.
Features
• Sealed retard mechanism (Model WFDT)
• Visual switch activation (Model WFDT)
• Twelve different flexible plastic paddles
• Vertical or horizontal mount
• Durable tamper resistant enclosure
• Dual SPDT switches in durable terminal block
• Sizes marked on flexible plastic paddles
• 100 percent synchronization activates both alarm panel and local bell
• Accommodates up to 12 AWG wire
Both the WFDT retard model and the WFDTNR non-retard model fit
any tee that has a 1˝ NPT branch, including: 1˝, 1¼˝, 1½˝ and 2˝ NPT
threaded ferrous and brass tees; 1˝, 1¼˝, 1½˝ and 2˝ copper sweat
tees; Central, Spears
®
, and Victaulic
®
brand 1˝ CPVC tees; and 1½˝
polybutylene tees.
Design.
The design of the WFDT and WFDTNR makes them easy
to install and simple to maintain. Either can be mounted in the
vertical or horizontal position. Two conduit openings permit easy
attachment to the local alarm system. The retard mechanism (Model
WFDT only) and switch assemblies are field-replaceable.
Features.
Twelve different flexible plastic paddles fit 1˝, 1¼˝, 1½˝, and
2˝ tees. Sizes are marked clearly on the paddles 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 WFDT and WFDTNR include a durable tamper
resistant enclosure and rugged switch assembly. The long lasting
covers completely enclose the electrical components to keep out
dust and dirt. Improved self-guiding security screws and removal
tools make detectors resistant to tampering and simplify field
maintenance. Dual SPDT switches are enclosed in a durable terminal
block for added strength.
Agency Listings
S739
CS169
7770-1209:149
167-93-E
T-Tap Waterflow Detector Specifications
Architectural/Engineering Specifications
Model shall be a WFDT or WFDTNR as manufactured by System Sensor. T-tap waterflow detectors shall be installed on a tee that has a 1˝ NPT branch including:
1˝, 1¼˝, 1½˝ or 2˝ threaded ferrous or brass tee; 1–2˝ copper sweat tees; Central, Spears,® and Victaulic® brand 1˝ CPVC tees; or 1½˝ 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. The non-retard t-tap detector shall respond with no time delay to waterflow in the specified direction and range. 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. All detectors shall be listed by Underwriters Laboratories for indoor or outdoor use.
Physical/Operating Specifications
Static Pressure Rating
250 PSI
Maximum Surge
18 FPS
Triggering Threshold
4–10 GPM
Bandwidth (Flow Rate)
Overall Dimensions,
WFDT: 4.5˝ H × 3.75˝ W × 6.7˝ L
Installed
(11.4cm H × 9.5cm W × 17cm L)
WFDTNR: 3.75˝ H × 3.25˝ W × 4.25˝ L
(9.5cm H × 8.2cm × W × 10.8cm L)
Contact Ratings
Two sets of SPDT (Form C)
10.0 A @ 125/250 VAC
2.5 A @ 24 VDC
Compatible Tee
Threaded ferrous and brass tees, copper
Fittings
sweat tees, CPVC tees, and polybutylene tees
Conduit Entrances
Two openings for ½˝ conduit.
Operating Temperature Range
32°F to 120°F (0°C to 49°C)
Enclosure Rating
UL indoor/outdoor rated
Cover Tamper Switch
UL models: optional P/N 546-7000
ULC/Canadian models: 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
Shipping Weight
WFDT: 2.6 lbs. (1.2 kg.)
WFDTNR: 1.5 lbs. (0.7 kg.)
Warranty
U.S. Patent Numbers
3 years
3,845,259; 4,782,333; 5,213,205
Electrical Connections for WFDT
T16-0010-XXX
B
COM
•CAUTION•
ROUTE WIRING
AWAY FROM
SHARP EDGES
& COPONENTS
Delay Adjustment Dial
0
Delay
adjustment
dial
NU
CO
M
A
SWITCH SCHEMATIC
•READY• STATE
CO
M
SWITCH 1
SWITCH 2
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.
WFDT/WFDTH
B
B
CONTACT RATINGS
125/250 VAC
10 AMPS
24 VDC
2.5 AMPS
DIAL
IS
AP
ON
LAY
IN
SE
PRO
CO
XIM
ER
DE
ND
A
B
M
IME
S
T
TE
WFDT/WFDTH
end-of-line
resistor
To nonsilenceable
initiating zone
of listed FACP
COM
COM
COM
COM
45
Typical FACP Connection
To power
source
compatible
with bell
B
NOTE: Retard time may exceed 90 seconds.
Adjust and verify that time does not exceed 90 seconds.
COM
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
local
bell
Ordering Information
UL Model
WFDT
WFDTNR
Accessories
A77-01-02
A77-01-08
A3008-00
PRK9
546-7000
S07-66-02
WFDW
WFDN4
C58-164-01
C58-195-01
ULC Model
WFDTA
Description
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
WFDTNRA
Waterflow Detector, non-retard, fits same tees as Model WFDT
Description
Replacement terminal block for WFDT
Replacement terminal block for WFDTNR
Replacement retard mechanism
Replacement paddle kit – 12 paddles for WFDT and WFDTNR (see WFDT for sizes)
Cover tamper switch kit for WFDT
Replacement tamper screws for covers of WFDT, WFDTNR
Replacement tamper proof wrench for cover of WFDT, WFDTNR
NEMA-4 gasket kit
Replacement metal cover
Replacement plastic cover (WFDTNR)
Spears® is a registered trademark of the Spears Manufacturing Company. Victaulic® is a registered trademark of the Victaulic Company of America.
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.
A05-0195-011 • 4/07 • #1676
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B
B
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