System Sensor WFDT, WFDTH User Manual
INSTALLATION AND MAINTENANCE INSTRUCTIONS
CAUTION
INSTALLATION GAGE
END OF PADDLE TREE MUST
FIT BETWEEN TOP OF TEE
AND BOTTOM OF FLANGE
TEE FITTING
PLASTIC VANE
TEE DEPTH
REFER TO TEE
DEPTH TABLE
TEE
ADAPTER
3
3
/4˝
(WFDT)
39/16˝
(WFDTH)
3˝
4
5
/16˝
3825 Ohio Avenue, St. Charles, Illinois 60174
WFDT/WFDTH Vane-type Waterflow Detectors
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: 250 PSI (Max.)
Dimensions, Installed: WFDT – 45⁄16 in H × 33⁄4 in W × 63⁄4 in D; WFDTH – 45⁄16 in H × 39⁄16 in W × 63⁄4 in D
Operating Temperature Range: 32°F to 120°F (0°C to 49°C)
Shipping Weight: 2.6 lbs
Enclosure Rating: WFDT – NEMA Type 4, as tested by Underwriters Laboratories, Inc. (UL) (IP56)
WFDTH – Indoor use only, as tested by UL (IP10)
The WFDTH 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.
FIGURE 1. MOUNTING DIMENSIONS:
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
I56-0480-013R
Use vane-type waterflow detectors in wet-pipe systems only. DO NOT USE IN
DRY-PIPE, DELUGE, OR PRE-ACTION SYSTEMS. The sudden inrush of water
in such systems may break the vane off or damage the mechanism. Do not use
in potentially explosive atmospheres. Do not leave unused wires exposed.
PRINCIPLES OF OPERATION
Vane-type waterflow detectors mount to water filled pipes in sprinkler systems. Water flow in the pipe deflects a vane. Deflection of the vane produces
a switched output, usually after a specified delay.
All WFDTs have a pneumatically controlled mechanical delay mechanism. Delays are noncumulative; they reset if the flow of water stops before the entire
delay has elapsed. 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
The WFDT and WFDTH fit 1- to 11⁄2-inch NPT threaded ferrous and brass,
1- to 2-inch sweat brass, 11⁄2-inch polybutylene plastic and 1-inch pvc plastic
tees having a 1-inch threaded NPT branch (see Figure 1 and chart for recommended tee depths). For 2-inch cast and malleable threaded tees use 2-inch
paddle (p02-0023-000) provided. The WFDT and WFDTH also fits 1-, 11/2-,
and 2-inch Reliable riser manifolds when used with paddle tree P02-0103-000
(purchased seperately). Use 1-inch CPVC paddle when installing detector on a
NIBCO 1-inch slip x 1-inch slip x 1-inch FPT.
APPROXIMATE TEE DEPTH REQUIREMENTS (SEE FIGURE 1)
Tee Depth Threaded Sweat Poly B CPVC
1 × 1 × 1˝ 21/8˝ 13/4˝ N/A 21/4˝ 215/32˝ 213/16˝
1
1
/4 × 11/4 × 1˝ 21/2˝ 21/6˝ N/A N/A N/A N/A
1
1
/2 × 11/2 × 1˝ 23/4˝ 21/4˝ 21/2˝ N/A N/A N/A
2 × 2 × 1˝ 3
1
/4˝ 23/4˝ N/A N/A N/A N/A
CPVC/Spears/
Victaulic
CPVC/Tyco
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 Protec-
tion 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.
N770-05-00 1 I56-0480-013R
W0126-00
Failure to follow these directions may result in failure of the device to report
TAMPER
PROOF
WRENCH
(P/N WFDW)
COVER
DELAY
MECHANISM
(P/N A3008-00)
GASKET
(WFDT ONLY)
WATERFLOW
FLOW
TERMINAL BLOCK
(REPLACEMENT P/N
A77-01-02)
GROUND SCREW
(GREEN)
MOUNTING
PLATE
PADDLE
(P/N PRK9)
FILLISTER
HEAD SCREW
1˝ NPT
THREAD
ACTUATOR
LEVER
COVER TAMPER
SWITCH
(P/N 546-7000)
CAUTION
WARNING
a waterflow condition. System Sensor 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
removal and a clear view of it for inspection. See Figure 1 for mounting
dimensions.
2. Locate to protect from damage, 6-7 feet above the floor.
3. On horizontal runs, position the detector on top of the pipe or on the side
of it. 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 con-
ditions 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 water flow, or no closer than 24 inches from a valve or drain.
5. BE SURE DIRECTION-OF-FLOW ARROW MATCHES ACTUAL DIRECTION OF FLOW IN THE PIPE.
FIGURE 2. ASSEMBLY DIAGRAM:
3. Carefully roll the vane opposite the direction of flow and insert through
tee. Thread detector onto tee fitting and tighten with wrench. Use of
thread sealant or tape is recommended. Use height gage (located at end
of paddle tree) to ensure proper depth of detector on tee fitting. See Fig-
ure 1. Height gage must fit between top of tee fitting and under side of
hex tee adapter. A gap between gage and tee adapter is acceptable. When
correctly installed, the detector must face in the proper direction of waterflow and be aligned with the pipe.
4. Remove the metal cover. Move the actuator lever back and forth to check
for binding. If the vane binds, remove the detector and correct the problem before proceeding.
Be sure the direction-of-flow arrow points in the right direction, otherwise a
waterflow condition will go unreported. See Figure 2.
PREOPERATION TESTING
1. Fill the sprinkler system with water and check for leaks around the
WFDT or WFDTH. If there is a leak, check to see that the fittings are
tight. If leak persists, drain the system and remove the detector (see removal instructions under Maintenance). Check for damaged threads or
cracked fitting. Reinstall the detector and check again for leaks. Do not
proceed until all leaks have been stopped.
2. Connect an ohmmeter or continuity tester across (COM and B-NO) terminal switch contacts. The ohmmeter should show an open circuit, no
continuity.
3. Deflect the actuator lever and hold it until the pneumatic delay shaft
releases the switch buttons. The ohmmeter or continuity tester should
show a short circuit after the delay has elapsed. If there is no delay,
check the setting of the delay adjustment dial.
FIELD WIRING
W0127-00
MOUNTING INSTRUCTIONS
1. The WFDT and WFDTH waterflow detectors are designed to fit only the
appropriate tee fitting.
NOTE: Leg of tee perpendicular to flow of water must have a 1-inch NPT
thread. Do not use a reducer to achieve the correct thread size. Failure
to follow this instruction will result in failure of the detector to report a
waterflow condition.
2. WFDT and WFDTH units are shipped without paddles mounted to the
actuator. Select the correct size paddle for the type of tee being used.
Align hole on stem of paddle with hole on actuator lever. Fasten together
using a #4-40×1⁄4-inch fillister head screw supplied in bag assembly. See
Figure 2. Use only the screw provided with the unit. Drive screw head
through hole in paddle until it seats to actuator lever surface. No washer
is required. For paddle replacement refer to Maintenance section.
High Voltage. Electrocution Hazard. Do not handle live AC wiring or work on
a device to which AC power is applied. Doing so may result in severe injury
or death.
When utilizing switches at voltages greater than 74VDC or 49VAC
means to provide all–pole disconnection must be incorporated in the fixed
wiring, such as a circuit breaker.
1. The WFDT and WFDTH have two SPDT switches. Switch contacts (COM
and B-NO) are closed when water is flowing and open when water is not
flowing. Connect the switches as shown in Figure 3 depending on the
application.
2. When connected to a listed sprinkler/fire alarm control panel, the initiating circuit must be non-silenceable.
3. A ground screw is provided with all units. When grounding is required,
clamp wire with screw in hole located between conduit entrance holes.
See Figure 2.
N770-05-00 2 I56-0480-013R
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