the device to report a waterflow 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.
FIGURE 2. ASSEMBLY DIAGRAM
W0388-02
MOUNTING INSTRUCTIONS
1. The WFDNFT waterflow detector is designed to only the appropriate tee fitting.
NOTE: The outlet branch of the tee 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. WFDNFT units are shipped without paddles mounted to the actuator. Select
the correct size paddle for the type of tee being used. Align the hole on the stem
of paddle with hole on the actuator lever. Fasten together using the supplied
screw. See Figure 2. Use only the screw provided with the unit. Drive screw head
through hole in paddle until it seats to the actuator lever surface. No washer is
required.
3. Apply up to two turns of teflon tape to the 1" NPT thread to help prevent leaks.
Install the adapter between one and two turns past hand tight. A 1" pipe plug
combined with a 1" NPT tee can be used to tighten the adapter. Use the supplied
gauge to verify a minimum of .15" clearance between the tee adapter shoulder
and tee. The flat side of the gauge must be able to fit in the gap between the tee
adapter and tee. See Figure 1.
4. Carefully roll the vane opposite the direction of flow and insert through tee.
Insert the O-ring into the groove in the internal adapter under the locking
collar. Hand tighten the locking collar to the tee adapter making sure the
detector is aligned parallel to the pipe. When correctly installed, the detector
must face in the proper direction of waterflow and be aligned with the pipe. The
provided directional cover illustrates flow direction for the detector.
5. Remove the cover. Move the actuator lever back and forth to check for binding.
If the vane binds, remove the detector and correct the problem before proceed-
ing.
CAUTION
Avoid using a pipe wrench to tighten the locking collar. Over-torquing the locking collar
may cause damage to the detector. If additional tightening past hand tight is required on
the collar, use of a band wrench is recommended to protect collar surface, not to exceed
hand tight plus 1 notch on collar.
Be sure the direction-of-flow arrow and directional cover point in the right direction,
otherwise a waterflow condition will go unreported. See Figure 2 and Figure 5.
PREOPERATION TESTING
1. After all fittings have had the manufacturer’s recommended curing time, fill the
sprinkler system with water and check for leaks around the detector. If there is a
leak, check to see that the fittings are tight. If the leak persists, drain the system
and remove the detector (see removal instructions under Maintenance). Check
for damage or cracked fittings. 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
WARNING
High Voltage. Electrocution Hazard. Do not handle live AC wiring or work on a de-
vice 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 WFDNFT has 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 6 depending on the application.
2. When connected to a listed sprinkler/fire alarm control panel, the initiating cir-
cuit must be unable to be silenced.
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 3.
4. Use proper waterproof conduit fittings where required. Ensure both conduit en-
tries are properly sealed to avoid debris entering the detector.
FIGURE 3. GROUND SCREW
GROUND
GROUND
SCREW
SCREW
W0383-01
MECHANICAL DELAY ADJUSTMENT
The pneumatic delay is preset at approximately 30 seconds at the factory. To adjust the
delay, turn the adjustment dial on the delay mechanism. Turn clockwise to increase
the delay, counterclockwise to decrease the delay. Delay can be adjusted over a range
from 0-90 seconds maximum. See Figure 4. As a point of reference when setting time
delay in dark environments the notch in the dial indicates an approximate 30 second
time delay and the larger of the three tabs indicates an approximate 60 second time
delay.
