TABLE 2.
MODEL NUMBER
HOLE DIAMETER
TORQUE SETTING
WFD20EN
31.8 mm +1.6 mm
1
1
/
4
in +
1
/
16
in
40.7 - 47.5 NT-M
30 - 35 FT-LBS
WFD25EN
WFD30EN
50.8 mm + 1.6 mm
2 in +
1
/
16
in
61.6 - 67.8 MT-M
45 - 50 FT-LBS
WFD40EN
WFD60EN
WFD80EN
3. Remove burrs and sharp edges from the hole. Clean and remove all scale and
foreign matter from the inside wall of pipe for a distance equal to the pipe di-
ameter on either side of the hole to ensure free movement of the vane. Clean the
outside of the pipe to remove dirt, metal chips, and cutting lubricant.
4. Seat the saddle gasket against the saddle and mount detector directly to pipe.
Carefully roll the vane opposite the direction of flow and insert it through the
hole (see Figure 4). Seat the saddle firmly against the pipe so that the locating
boss goes into the hole.
5. Install the U-bolt, tightening the nuts alternately to ensure a uniform seal (see
Table 2 for torque values).
6. Remove the 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 cause before proceeding.
CAUTION
Be sure the direction-of-flow arrow and directional cover point in the correct direc-
tion, or else waterflow will go unreported. See Figure 4.
FIGURE 1. MOUNTING DIMENSIONS
8.9 CM
(3.5")
6.6 CM
(2.6")
PIPE DIAMETER
PLUS 12.7 CM
(5")
PIPE
VANE
OVERALL WIDTH = PIPE DI 6.4 CM (2.5")
U-BOLT
NUT
PIPE
SADDLE
U-BOLT
PIPE
W0384-00
FIGURE 2. LOCATION OF MOUNTING HOLE TOP VIEW
WRONG
RIGHT
REMOVE BURRS FROM EDGE OF HOLE. CLEAN OUT SCALE
AND FOREIGN MATTER FROM INSIDE WALL OF PIPE.
W0106-00
PREOPERATION TESTING
1. Fill the fire sprinkler system and check for leaks around the waterflow detector.
If it leaks, first check for proper torque on U-bolt nuts. If leak persists, drain the
system and remove the detector (refer to Maintenance). Check for dirt or for-
eign objects under the gasket, and make sure that the pipe surface is not dented.
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 switch ter-
minals. The ohmmeter should indicate an open circuit.
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
1. All models have two SPDT switches. Switch contacts COM and B-NO are closed
when water is flowing and open when water is not. Connect the switches as
shown in Figure 7 depending on the application.
2. When connected to a listed fire sprinkler/fire alarm control panel, the initiating
circuit must be unable to be silenced.
3. A ground screw is provided with all waterflow detectors. When grounding is
required, clamp wire with screw in hole located between conduit entrance 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 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 field
wiring, such as a circuit breaker.
MECHANICAL DELAY ADJUSTMENT
The pneumatic delay is preset at the factory to a dial setting of approximately 25 sec-
onds. To adjust the setting, turn the adjustment dial clockwise to increase the delay,
counterclockwise to decrease it. Delay can be adjusted over a range from 0 to 30 sec-
onds maximum, see Figure 3.
NOTE: Set the delay to the minimum required to prevent false alarms due to flow
surges.
Periodically test time delay as required by Authority Having Jurisdiction or code au-
thority.
2
I56-4051-F
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