WFDNFT 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 @ 12/24 VDC
Triggering Threshold Bandwidth (Flow Rate):
4 – 10 GPM
Static Pressure Rating:
175 PSI (Max.)
Dimensions, Installed:
WFDNFT – 4 in H x 3½
in W x 6¾ in D
Operating Temperature Range:
32°F to 150°F (0°C to 66°C)
Enclosure Rating:
WFDNFT – NEMA 4/IP54, as tested by Underwriters Laboratories, Inc. (UL)
The WFDNFT 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 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 WFDNFT 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 WFDNFT detectors have a pneumatically controlled mechanical delay mecha-
nism. 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 down-
stream of the device.
COMPATIBLE PIPE TEES/RISERS
The WFDNFT is supplied with 12 paddles. One paddle is provided for each size of
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.
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 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. Failure to follow these directions may result in failure of
I56-4263-B
FIGURE 1. MOUNTING DIMENSIONS AND APPROXIMATE TEE DEPTH
REQUIREMENTS
3-1/2"
2-5/8"
TEE
DEPTH
4-3/32”
PLASTIC VANE
LOCKING
COLLAR
TEE
ADAPTER
.15”
TEE FITTING
GAUGE SUPPLIED ON
PADDLE TREE MUST FIT
BETWEEN TEE ADAPTER
SHOULDER AND TEE
W0400-00
APPROXIMATE TEE DEPTH REQUIREMENTS
TEE SIZE
Steel*/
Brass
Threaded
Copper*
Sweat
CPVC
NIBCO
CPVC
SPEARS
w/Metal Band
CPVC
SPEARS w/
Brass Insert
CPVC
TYCO
1 X 1 X 1"
2
1
/
8
"
1
3
/
4
"
2
1
/
8
"
(1)
2
3
/
32
"
(1)
2
1
/
2
"
(2)
2
3
/
4
"
(3)
1
1
/
4
X 1
1
/
4
x 1"
2
1
/
2
"
2
1
/
8
"
N/A
N/A
N/A
N/A
1
1
/
2
X 1
1
/
2
x 1"
2
3
/
4
"
2
1
/
4
"
N/A
3"
(4)
N/A
N/A
2 X 2 X 1"
3
1
/
4
"
2
3
/
4
"
N/A
N/A
N/A
N/A
(1) Use paddle marked 1” CPVC; (2) Use paddle marked SPEARS 1” CPVC;
(3) Use paddle marked TYCO 1” CPVC; (4) Use paddle marked 1
1
/
2
” CPVC
This waterflow detector has been evaluated for use with UL Listed CPVC fittings manu-
factured by the following companies: Tyco, Nibco and Spears Manufacturing Company.
The Model WFDNFT is required to be installed in accordance with the Listing limitations
specified by the manufacturer of the tee fitting.
*See UL Listing Limitations on page 4.
1
I56-4263-B
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