SS-200-036 1 I56-4165-D
WFDTNA Vane-type Water flow 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:
WFDTNA – 4in H x 3½
in W x 6¾ in D
Operating Temperature Range:
32°F to 120°F (0°C to 49°C)
Enclosure Rating:
WFDTNA – NEMA Type 4, as tested by Underwriters Laboratories, Inc. (UL) (IP56)
The WFDTN can be installed between 2×4 stud wall construction.
IMPORTANT
Please Read Carefully And Save
This instruction manual contains important information about the installation and
operation of water flow detectors. Purchasers who install water flow 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 WFDTNA is a vane-type water flow detector for use in wet-pipe fire sprin-
kler systems only. Vane-type water flow detectors shall not be used as the sole initiat-
ing device in both deluge and preaction systems; water flow 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 water flow detectors mount to water filled pipes in fire sprinkler systems.
Water flow in the pipe deflects a vane. Deflection of the vane produces a switched
output, usually after a specified delay.
All WFDTNAs 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 WFDTNA 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
WFDTNA 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
CPVC/Spears/
NIBBCO
CPVC/Tyco/NIBBCO
1 × 1 × 1˝
2
1
/
8
˝
1
3
/
4
˝
2
1
/
4
˝
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
˝
N/A
N/A
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 water flow 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
CAN/ULC S524: Installation of Fire Alarm Systems
Also, follow other applicable NFPA and ULC standards, local codes and the require-
ments of the authority having jurisdiction.
W0390-00
