WFDNFS 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:
WFDNFS – 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:
WFDNFS – NEMA 4/IP54, as tested by Underwriters Laboratories, Inc. (UL)
The WFDNFS 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 WFDNFS 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 WFDNFS 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 WFDNFS is supplied with 6 paddles. One paddle is provided for each size of
CPVC tee. See Figure 1 and approximate tee depth chart. Each paddle has an indica-
tion 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 the device to report a water-
flow condition. Safe Signal is not responsible for devices that have been improperly
installed, tested or maintained.
1. Mount the detector where there is adequate clearance for installation and re-
moval and a clear view of it for inspection. See Figure 1 for mounting dimen-
sions.
2.
Locate the detector 6 to 7 feet above the floor to protect from accidental
damage.
3. On horizontal runs, position the detector on top or side of the pipe. Do not
mount it upside down because condensation may collect in the housing and
impair the operation of the detector.
For vertical flow applications, mount detector on pipe where upflow conditions
exist. Failure to do so may prevent unit from operating properly.
4. Mount detector at least 6 inches from a fitting which changes the direction of
the waterflow, or no less than 24 inches from a valve or drain.
5. BE SURE DIRECTION-OF-FLOW ARROW AND DIRECTIONAL COVER
MATCHES ACTUAL DIRECTION OF FLOW IN THE PIPE. See Figure 5.
I56-4262-B
W0399-00
FIGURE 1. MOUNTING DIMENSIONS AND APPROXIMATE TEE DEPTH
REQUIREMENTS
3-1/2"
2-5/8"
4-1/2"
TEE
DEPTH
PLASTIC VANE
LOCKING
COLLAR
TEE
ADAPTER
TEE FITTING
APPROXIMATE TEE DEPTH REQUIREMENTS
Tee Depth
SPEARS
TYCO
NIBCO
IPEX
1 × 1 × 1"
2
3
/
8
"
2
5
/
16
"
2
11
/
32
"
2
5
/
8
"
1
1
/
4
× 1
1
/
4
× 1"
2
29
/
32
"
2
9
/
16
"
2
3
/
4
"
3"
1
1
/
2
× 1
1
/
2
× 1"
3
1
/
8
"
3
5
/
32
"
3
1
/
16
"
3
1
/
4
"
2 × 2 × 1"
3
11
/
16
"
3
11
/
16
"
3
1
/
2
"
3
3
/
4
"
This waterflow detector has been evaluated for use with UL Listed CPVC fittings manufac-
tured by the following companies: Tyco, Nibco, Ipex, and Spears Manufacturing Company.
The Model WFDNFS is required to be installed in accordance with the Listing limitations
specified by the manufacturer of the tee fitting.
1
I56-4262-B
4/21
