System Sensor WFDN Series Installation And Maintenance Instructions page 2

3. Remove burrs and sharp edges from the hole. Clean and remove all scale
and foreign matter from the inside of the pipe for a distance equal to the
pipe diameter 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 cut-
ting lubricant.
4. Seat the gasket against the saddle and mount the detector directly to the
pipe. Carefully roll the vane opposite the direction of flow and insert it
through the hole (see Figure 3). 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 1 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.
Be sure the direction-of-flow arrow and directional cover point in the correct
direction or else water flow will go unreported. See Figure 3 and Figure 6.
FIGURE 1. MOUNTING DIMENSIONS:
6.6 CM
(2.6")
U-BOLT
NUT
PIPE
SADDLE
U-BOLT
OVERALL WIDTH = PIPE DIAMETER + 6.4 CM (2.5")
FIGURE 2. MOUNTING HOLE LOCATION:
TABLE 1:
WFDN MODEL HOLE SIZE (IN)
20, 25
40
30, 50, 60, 80
SS-200-025
CAUTION
8.9 CM
(3.5")
PIPE DIAMETER
PLUS 12.7 CM
(5")
PIPE
PIPE
VANE
W0384-00
TORQUE
1
1 / 30–35 ft.-lb.
4
2 45–50 ft.-lb.
2 60-65 ft.-lb
PRE-OPERATION TESTING
1. Fill the fire sprinkler system and check for leaks around the waterflow
detector. If it leaks, first check for the proper torque on the U-bolt nuts.
If the leak persists, drain the system and remove the detector (refer to
Maintenance). Check for dirt or foreign 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 the COM and B-NO
switch terminals. 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.
FIGURE 3. ASSEMBLY DIAGRAM:
MOUNTING PLATE
PIPE SADDLE
ROLL PADDLE
OPPOSITE OF
FLOW ARROW
WHILE INSERTING
SADDLE GASKET
FIELD WIRING
1. All models have two SPDT switches. Switch contacts COM and B-NO
are closed when water is flowing and open when it 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 ground-
ing is required, clamp wire with screw in hole located between conduit
entrance holes. See Figure 4.
4. Use proper waterproof conduit fittings where required.
W0106-00
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 injury or death.
When utilizing switches at voltages greater than 74VDC
means to provide all–pole disconnection must be incorporated in the fixed
wiring, such as a circuit breaker.
MECHANICAL DELAY ADJUSTMENT
The pneumatic delay is preset at the factory to 30 seconds. To adjust the set-
ting, turn the adjustment dial clockwise to increase the delay, counterclock-
wise to decrease it. The delay is adjustable from 0 to 90 seconds max. See
2
TAMPER PROOF
WRENCH
(P/N WFDW)
COVER
TIMER
(REPLACEMENT
P/N FS-RT)
COVER TAMPER
SWITCH
(OPTIONAL P/N CTS)
REFER TO
TABLE 1
WARNING
ELECTRICAL
CONDUIT
ENTRANCE
U-BOLT
NUT
PIPE
U-BOLT
W0392-00
or 49VAC
I56-4045-002R
1/19