WFDTN Vane-type Waterflow Detectors
INSTALLATION AND MAINTENANCE INSTRUCTIONS
SPECIFICATIONS
Contact Ratings:
Two sets of SPDT (Form C); 10 A @ 125/250 VAC
; 2.5 A @ 24 VDC
Triggering Threshold Bandwidth (Flow Rate):
4 – 10 GPM
Static Pressure Rating:
375 PSI (Max.)
Dimensions, Installed:
WFDTN – 4in H x 3½ in W x 6¾ in D
Operating Temperature Range:
32°F to 150°F (0°C to 66°C)
Enclosure Rating:
WFDTN – NEMA Type 4, as tested by Underwriters Laboratories, Inc. (UL)
The WFDTN can be installed between 2×4 stud wall construction.
U.S. Patent Number:
5,213,205
IMPORTANT
Please Read Carefully And Save
This instruction manual contains important information about the installation and
operation of waterflow detectors. Purchasers who install waterflow detectors 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 WFDTN is a vane-type waterflow detector for use in wet-pipe fire sprin-
kler systems only. Vane-type waterflow detectors shall not be used as the sole initiat-
ing device in both deluge and preaction systems; waterflow detectors 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 na-
tional 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 systems.
Waterflow in the pipe deflects a vane. Deflection of the vane produces a switched
output, usually after a specified delay.
All WFDTNs have a pneumatically controlled mechanical delay mechanism. Delays
do NOT accumulate; they reset if the flow of water stops or drops below minimum
triggering flow rate before the entire delay has elapsed. All detectors will activate on
a sustained flow of water of 10 gallons per minute (gpm) or greater downstream of
the device.
COMPATIBLE PIPE TEES/RISERS
The WFDTN 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. The
WFDTN also fits 1", 1½", and 2" Reliable riser manifolds when used with paddle tree
P02-0032-300 (purchased separately).
APPROXIMATE TEE DEPTH REQUIREMENTS (SEE FIGURE 1)
Tee Depth
Threaded
Sweat
CPVC NIBCO/
SPEARS
(no insert)
CPVC
SPEARxS
(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
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: National Fire Alarm Code
NFPA 13: Installation of Sprinkler Systems
NFPA 25: Inspection, Testing, and Maintenance of Water-based Fire Protection
Systems, Section 5.3.3.2
NFPA 13D: Standard for 1 and 2 Family Dwellings and Manufactured Homes
NFPA 13R: Standard for Multi-family Dwellings
Also, follow other applicable NFPA standards, local codes and the requirements of the
authority having jurisdiction.
I56-4043-D
W0390-00
1
I56-4043-D
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