FIGURE 2. ASSEMBLY DIAGRAM
GAP MAY BE PRESENT
W0401-01
MOUNTING INSTRUCTIONS
1. The WFDNFS waterflow detector is designed to a fit 1" CPVC tee fitting.
2. WFDNFS 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 solvent cement according to the CPVC fitting manufacturer’s specifica-
tions to the tee-adapter and tee. Insert the tee-adapter into the tee, making sure it
bottoms out. For some tees, a gap between the tee adapter and tee may be present.
See Figure 2. Wait until the solvent cement has cured before continuing. NOTE:
Solvent cement and CPVC fitting assembly must be completed and cured in ac-
cordance with the Listing limitations of the tee manufacturer.
4. Carefully roll the vane opposite the direction of flow and insert through tee. In-
sert 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.
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.
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 proceeding.
CAUTION
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 WFDNFS 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.
NOTE: Set the delay to the minimum required to prevent false alarms due to flow
surges.
After extended service, parts of the detector may become worn reducing the time de-
lay and causing false alarms. If this happens, increase the delay. If the delay is already
at maximum, replace the mechanical delay assembly. Refer to Maintenance section
for ordering replacement parts.
OPERATIONAL TESTING
Always notify a central station monitoring waterflow alarms before repairing, main-
taining or testing waterflow alarm devices.
1. Replace the cover and tighten the security screws with the tamper proof wrench.
Store the wrench in a secure place.
2. Open the inspector’s test valve and time how long it takes for the detector to
indicate a flow condition. The detector should remain activated until the inspec-
tor’s test valve is closed. Air pockets in the sprinkler system may increase the
apparent time delay.
2
I56-4262-B
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