Mounting Instructions
1. Drain the pipe.
2. Cut a hole at the desired location. Center the hole in the pipe, as
shown in Figure 2, and be sure the hole is perpendicular to the center
of the pipe. Before drilling, use a punch or scribe to mark the drill site
to prevent the bit from slipping. If the hole is off center, the vane will
bind against the inside wall of the pipe. Use a drill or hole saw to cut
a hole of the proper diameter. See Table 1 for hole size.
CAUTION
When drilling the hole with a hole saw, make certain that the center of
the cut does not remain in the pipe.
3. Remove burrs and sharp edges from the hole. Clean and remove all
scale and foreign matter from the inside of the pipe for one diameter
on each side of the hole to ensure free movement of the vane. Clean
the outside of the pipe to remove dirt, metal chips, and cutting lubri-
cant.
4. Seat the O-ring or 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. 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 metal cover with the tamper-proof wrench provided.
Manually actuate the limit 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 points in the right direction or else
water flow will go unreported. See Figure 3.
Preoperation Testing
1. Fill the 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
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.
Wiring
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 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. All models have two SPDT switches. Switch contacts COM and B are
closed when water is flowing and open when it is not. Connect the
switches, as shown in Figure 4, depending on the application.
2. When connected to a listed sprinkler/fire alarm control panel, the
initiating circuit must be non-silenceable.
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 3, page 3.
4. If a second conduit entry is required, remove the plug using a hex
wrench.
Wrong
Right
Remove burrs from edge of hole. Clean out scale
and foreign matter from inside wall of pipe.
W0238-00
Figure 1. Mounting dimensions:
W0106-00
Figure 2. Mounting hole location:
Table 1:
WFD MODEL*
HOLE SIZE
20, 25, 35
1
1
/
4
˝
30-2, 40, 50, 60, 80
2˝
Table 2:
WFD MODEL*
TORQUE
20, 25, 35
30-35 ft.-lb.
30-2, 40, 50, 60, 80
55-60 ft.-lb.
*See model listing on page 1 for pipe sizes.
D770-24-00
2 I56-1452-004R
6.75˝
4.019˝
5.019˝
U-BOLT NUT
PIPE SADDLE
U-BOLT
PLASTIC VANE
PIPE
PIPE DIAMETER
PLUS 6.5˝
Mechanical Delay Adjustment
The pneumatic delay is preset at the factory to 30 seconds. To adjust the
setting, turn the adjustment dial clockwise to increase the delay, coun-
terclockwise to decrease it. The delay is adjustable from 0 to 70 seconds.
See Figure 5, page 4.
NOTE:
Set the delay to the minimum required to prevent false alarms
from flow surges.
After extended service, parts of the detector may become worn, reduc-
ing the delay time and causing false alarms. If this happens, increase the
delay. If the delay is already at the maximum, replace the mechanical
delay assembly. Refer to Maintenance for ordering replacement parts.
