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 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 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.
4. Mount detector at least 6 inches from a fitting which changes the direc-
tion 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 3
.
MOUNTING INSTRUCTIONS
1. This WFDTNRN waterflow detector is designed to fit only the appropri-
ate tee fitting.
NOTE:
The outlet branch of 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 con-
dition.
2. WFDT units are shipped without the paddles mounted to the actuator. Se-
lect the correct size paddle for the tee being used the appropriate nominal
pipe diameter size is molded on the surface of the paddles. Align hole on
stem of paddle with hole on actuator lever. Fasten together using a #4-40
x
3
/
8
-inch fillister head screw supplied in bag assembly. See
Figure 2
. Use
only the screw provided with the WFDTNRN. Drive screw head through
hole in paddle until it seats firmly to actuator lever surface. No washer is
required. For paddle replacement refer to Maintenance section.
3. Thread detector onto tee fitting and tighten with wrench. Use of thread
sealant or tape is recommended. Use height gage (located at end of pad-
dle tree) to ensure proper depth of detector on tee fitting. See
Figure
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 wa-
terflow and be aligned with the pipe, the provided directional cover il-
lustrates flow direction for device.
4. Remove the plastic cover with the tamper proof wrench provided. 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 points in the correct
direction, otherwise a waterflow condition will go unreported. See
Figure 3
.
FIGURE 3. DIRECTIONAL COVER
OPERATIONAL TESTING
Always notify a central station monitoring waterflow alarms before repairing,
maintaining, or testing waterflow alarm devices.
1. Fill the fire sprinkler system and check for leaks around the WFDTNRN.
If it leaks, check to see that the fittings are tight. If leak persists, drain the
system and remove the detector (see removal instructions under Main-
tenance). Check for damaged threads or cracked fitting. Reinstall detec-
tor and check again for leaks. Do not proceed until all leaks have been
stopped.
2. With cover removed, connect an ohmmeter or continuity tester across
(COM and B-NO) terminal switch contacts. The ohmmeter should show an
open circuit, no continuity (when the red switch buttons are depressed).
3. Deflect the actuator lever to release the switch buttons. The ohmmeter or
continuity tester should show a short circuit when the switch buttons are
released.
4. Open the inspector’s test valve to allow the detector to indicate a flow
condition. The detector should remain activated until the inspector’s test
valve is closed. Air pockets in the sprinkler system may prevent the de-
tector from firing immediately.
5. Replace the cover and tighten the security screws with the tamper proof
wrench. Store wrench is a secure place.
FIELD WIRING
1. The WFDTNRN 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 4
depending on the
application.
2. When connected to a listed sprinkler/fire alarm control panel, the initiat-
ing circuit must be be unable to be silenced.
3. A ground screw is provided with all WFDTNRN units. When grounding
is required, clamp wire with screw in hole located between conduit en-
trance holes. See
Figure 5
.
4. Use proper waterproof conduit fittings where required.
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 field wir-
ing, such as a circuit breaker.
NOTCHED COVER INDICATES FLOW DIRECTION AT A
DISTANCE FROM MULTIPLE VIEWING ANGLES
W0382-00
2
I56-4044-004
11-09
