WFDN Series
Waterflow Detector
Indoor/Outdoor Waterflow Detector
The Gamewell-FCI, Water Flow Detector (WFDN) Series is
a sturdy, UL-listed, NEMA 4-rated enclosure that was redesigned to include an enhanced damage resistant metal
enclosure. The waterflow detector is used for both indoor
and outdoor applications. In addition, it offers the widest
available temperature range, from 32°F to 150°F. It is also
approved for the widest range of pipe schedules, sizes 2
in. thru 4 in. pipe and Schedules 7 thru Schedule 40. The
Gamewell-FCI, WFDN Series is compatible with the following Schedules and sizes:
• Schedule 7 thru 40 steel pipe for sizes 2 in. thru 4 in.
• Schedule 10 thru 40 steel pipe for sizes 5 in. thru 8 in.
The WFDN Series can be mounted in a vertical or horizontal position.
UL-listed models are equipped with tamper-resistant cover
screws to prevent unauthorized entry. The WFDN Series
contains the following enhancements to offer a quick and
simple wiring solution.
- two sets of SPDT (Form C) synchronized switches that
are enclosed in a durable terminal block.
- a redesigned terminal block layout and wire-ready
- COM terminals are located on a different elevation.
- a large barrier extends between switches.
- easy-to-read raised textured lettering.
- an optional cover tamper switch is available and
securely snaps into place, no tools required.
The WFDN Series incorporates a mechanical time delay
feature, which minimizes the risk of false alarms due to
pressure surges or air trapped in the fire sprinkler system.
This new feature includes a large and easy-to-turn timer
dial with high contrast pad printed markings that allows you
to easily set the waterflow detector. The dial contains three
tabs to allow easy adjustment when turning. The larger tab
is located on the dial position to allow you to adjust the
time delay approximately 60 seconds. To allow you to easily set the detector in dimly lit locations, the new design
includes a notch to allow you to adjust the time delay
approximately 30 seconds.
• UL®-listed models are NEMA 4 rated.
• Provides superior water sealing.
• Contains a sealed retard mechanism that is immune to
dust and other contaminants.
• Has a reduced product weight.
• Accommodates up to 12 AWG wire.
• Includes upgraded wiring with a new terminal block layout and wire-ready terminals.
• Equipped with a field-replaceable timer/switch assembly with an improved timer repeatability and accuracy.
• Offers a new redesigned directional cover that allows
installers and inspectors to easily see the direction of
the water flow and includes the following features:
- superior seal
- corrosion resistant
- lightweight cover
- unpainted
• Has a snap-in optional cover tamper switch.
• Built with tamper-resistant cover screws.
• Less exposed metal reduces shock hazard, plastic
cover acts as an insulator and is resistant to arcing.
• Allows for visual and audible switch activation (73 dBA).
• Retains an enhanced switch synchronization that
activates the following:
- alarm panel
- local bell
- horn strobe
The WFDN Series is designed for accuracy and repeatability. The detector also offers improved performance during a
vibration in riser applications where detectors are exposed
to a large inrush of water.
UL® is a registered trademark of Underwriter’s Laboratories, Inc.
12 Clintonville Road, Northford, CT 06472-1610 USA • Tel: (203) 484-7161 • Fax: (203) 484-7118
Specifications are for information only, are not intended for installation purposes, and are subject to change without notice. No responsibility is assumed by Gamewell-FCI for their use.
9021-60903 Rev. A page 1 of 3
©2015 by Honeywell International Inc. All rights reserved.
Waterflow Detector Specifications
Engineering Specifications
Vane-type waterflow detectors shall be installed on system
piping as designated 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 5 in. from any fittings that may change
water direction, flow rate, or pipe diameter or no closer
than 24 in. 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 450 psi for 2 in. – 8 in. pipes. The
detector 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 an 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.
Standard Specifications
Static Pressure Rating
450 PSI
Maximum Surge
18 Feet Per Second (FPS)
Triggering Threshold
Bandwidth (Flow Rate) 4–10 GPM
Conduit Entrances
Two openings for ½ in. conduit.
One open, one knock-out type
Contact Ratings
Two sets of SPDT (Form C)
10.0 A, ½ HP @ 125/250 VAC
2.5 A @ 6/12/24 VDC
Compatible Pipe
Steel water pipe, schedule
7 through 40
Operating Temperature
32°F to 150°F (0°C to 66°C)
Enclosure Rating
NEMA 4 – suitable for indoor/
outdoor use
Cover Tamper Switch
Standard with ULC models,
optional for UL models,
part no. CTS
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
3 Years
Figure 2 WFDN Delay Adjustment Dial
Figure 1 WFDN Dimensions
12 Clintonville Road, Northford, CT 06472-1610 USA • Tel: (203) 484-7161 • Fax: (203) 484-7118
9021-60903 Rev. A page 2 of 3
Figure 3 WFDN Field Wiring Diagram
Ordering Information
Part Number
UL Model
ULC Model
Pipe Size
2 in.
2½ in.
3 in.
4 in.
5 in.
6 in.
8 in.
Compatible with 1 in.,
1 1/4 in., 1 1/2 in., and 2 in.
Tee branch pipes.
Hole Size
1¼ in.
1¼ in.
2 in.
2 in.
2 in.
2 in.
2 in.
1 in., NPT
Shipping Weight
2.6 lbs.
2.6 lbs.
3.1 lbs.
4.0 lbs.
4.9 lbs.
5.6 lbs.
7.3 lbs.
Delay mechanism and switch assembly
Tamper-proof switch kit
Tamper-proof wrench for cover
Note: The Schedule 7 through 40 steel pipe are rated for use with sizes 2 in. to 4 in. The Schedule 10 through 40 steel pipe are
rated for use with sizes 5 in. to 8 in.
12 Clintonville Road, Northford, CT 06472-1610 USA • Tel: (203) 484-7161 • Fax: (203) 484-7118
9021-60903 Rev. A page 3 of 3