WFDTNRN Vane-type Waterflow Detector
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
IMPORTANT
Please Read Carefully And Save
This instruction manual contains important information about the installation
and operation of waterflow detectors. Purchasers who install waterflow detec-
tors for use by others must leave this manual or a copy of it with the user.
Read all instructions carefully before beginning.
CAUTION
The model WFDTNRN is a vane-type waterflow detector for use in wet-pipe
fire sprinkler systems only. Vane-type waterflow detectors shall not be used as
the sole initiating device in both deluge and preaction systems; waterflow de-
tectors used in these types of systems may result in an unintended discharge
caused by a surge, trapped air or a short retard time.
WARNING
Installation must be performed by qualified personnel and in accordance with
all national and local codes and ordinances.
Shock hazard:
Disconnect power source before servicing. Serious injury or
death could result.
Risk of explosion:
Not for use in hazardous locations. Serious injury or death
could result.
PRINCIPLES OF OPERATION
Vane-type waterflow detectors mount to water filled pipes in fire sprinkler sys-
tems. Waterflow in the pipe deflects a vane. Deflection of the vane produces
a switched output. All detectors will activate on a sustained flow of water
greater than 10 gallons per minute (gpm) but will not activate if the flow rate
is less than 4 gpm.
COMPATIBLE PIPE TEES/RISERS
Model WFDTNRN is supplied with 12 paddles. One paddle is provided for
each size of the threaded, sweat or plastic tee. See
Figure 1
and approximate
tee depth chart. Each paddle has an indication that shows the pipe size and
type of tee to be used with.
FIGURE 1. MOUNTING DIMENSIONS
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
INSTALLATION GUIDELINES
Before installing any waterflow alarm device, be thoroughly familiar with:
NFPA 72:
Installation, Maintenance and Use of Local Protective Signalling
Systems
NFPA 13:
Installation of Sprinkler Systems, specifically Section 3.17
NFPA 25:
Inspection, Testing and Maintenance of Sprinkler Systems, specifi-
cally Chapters 4 and 5, and Section 5.3.3.2
NFPA 13D:
Standard for Residential Dwellings
NFPA 13R:
Standard for Multifamily Dwellings
FIGURE 2. ASSEMBLY DIAGRAM
COVER
FLOW
COVER TAMPER
SWITCH (OPTIONAL P/N CTS)
TIMER
ASSEMBLY
(P/N FS-RT)
GASKET
ACTUATOR
LEVER
WATERFLOW
GROUND SCREW
MOUNTING
PLATE
PADDLE
1" NPT
THREAD
TAMPER PROOF
WRENCH (P/N WFDW)
FILISTER HEAD
SCREW
SPECIFICATIONS
Contact Ratings:
10 A @ 125/250 VAC
; 2.5 A @ 24 VDC
Triggering Threshold Bandwidth (Flow Rate): 4 to 10 GPM
Static Pressure Rating:
250 PSI (Max.)
Dimensions (Installed):
4in H x 3½ in W x 6¾ in D
Operating Temperature Range:
32°F to 150°F (0°C to 66°C)
Shipping Weight:
2 lbs
Enclosure Rating:
NEMA 4
U. S. Patent Number:
5,213,205
I56-4044-004
W0388-01
W0390-00
APPROXIMATE TEE DEPTH REQUIREMENTS (SEE FIGURE 1)
Tee Depth
Threaded
Sweat
CPVC NIBCO/
SPEARS
(no insert)
CPVC
SPEARS
(with insert)
CPVC/Tyco
1 × 1 × 1"
2
1
/
8
"
1
3
/
4
"
2
1
/
8
"
2
15
/
32
"
2
13
/
16
"
1
1
/
4
× 1
1
/
4
× 1"
2
1
/
2
"
2
1
/
8
"
N/A
N/A
N/A
1
1
/
2
× 1
1
/
2
× 1"
2
3
/
4
”
2
1
/
4
"
3"
3"
N/A
2 × 2 × 1"
3
1
/
4
"
2
3
/
4
"
N/A
N/A
N/A
1
I56-4044-004
11-09
