WFD
B
B
COM
COM
WFD
B
B
COM
COM
nonsilenceable
initiating zone of listed
Fire Alarm Control Panel
Typical Fire Alarm Control Panel Connection
Two Waterflow Detectors Shown
power source
compatible
with bell
local
bell
COM
B
Typical Local Bell Connection
Top View
NOTE: Common and B connections will
close when vane is deflected, i.e.,
when water is flowing. Dual switches
permit applications to be combined
on a single detector.
end-of-line-resistor
Break wire as shown for
supervision of connection.
DO NOT allow stripped wire
leads to extend beyond
switch housing. DO NOT
loop wires.
CONTACT RATINGS
125/250 VAC
24 VDC
10 AMPS
2.5 AMPS
B
COM
A
Schematic of
Individual Switch
in “No Waterflow”
Condition
T16-0010-XXX
B
COM
A
COM
COM
SWITCH 1 SWITCH 2
A
B B
A
•CAUTION•
ROUTE WIRING
AWAY FROM
SHARP EDGES
& COMPONENTS
SWITCH SCHEMATIC
•READY• STATE
Operational Testing
Always notify a central station monitoring waterflow alarms before repair-
ing, maintaining, or testing waterflow alarm devices.
1. Replace the cover and tighten the tamper proof 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 inspector’s test valve is closed. Air pockets in the
sprinkler system may increase the apparent delay.
Maintenance
To prevent accidental water damage, control valves should be shut
tight and the system completely drained before waterflow detectors are
removed or replaced.
Inspect detectors in accordance with applicable NFPA codes and standards
and/or the authority having jurisdiction for leaks and replace if a leak
occurs. Test detectors at least quarterly, as described under Operational
Testing, to ensure proper operation. Test more often if required by the
authority having jurisdiction.
Under normal conditions, System Sensor waterflow detectors should
provide years of trouble-free service. However, if the delay mechanism or
switch enclosure needs to be replaced, follow these directions. To replace
the delay mechanism or switch enclosure, use a 3⁄16
˝
socket head screw-
driver to remove the three screws that hold it in place. Either mechanism
can be easily replaced without removing the detector from the pipe or
draining the pipe. To replace the delay mechanism, request Part No. A3008-
00. For switch enclosure, request Part No. A77-01-02. Do not repair or
replace any other waterflow detector components. If any other part of the
detector does not perform properly, replace the entire detector. Installation
methods other than those listed in this installation manual may prevent
the device from reporting the flow of water in the event the associated
sprinkler system is activated by a fire. System Sensor is not responsible for
devices that have been improperly installed, tested, or maintained.
D770-24-00
3 I56-1452-004R
W0183-00
Figure 3. Assembly diagram:
W0234-00
Figure 4. WFD wiring:
COVER
SWITCH
ENCLOSURE
(REPLACEMENT
P/N A77-01-02)
GROUND SCREW
(GREEN)
CONDUIT
ENTRANCE
U-BOLT NUT
DIRECTION OF
FLOW ARROW
PIPE
U-BOLT
HOLE SIZE
(REFER TO CHART)
SADDLE GASKET
ROLL PADDLE (VANE)
OPPOSITE OF FLOW ARROW
WHILE INSERTING
PLASTIC VANE
PIPE SADDLE
DELAY MECHANISM
(REPLACEMENT
P/N A3008-00)
To remove a detector:
1. Drain the pipe.
2. Turn off electrical power to
the detector and disconnect the
wiring.
3. Loosen the nuts and remove
the U-bolts.
4. Gently lift the saddle far enough
to get your fingers under it.
Then, roll the vane so it will fit
through the hole while continu-
ing to lift the waterflow detec-
tor saddle.
5. Lift the detector clear of the
pipe.
CAUTION
If a vane breaks in a pipe, find
and remove it. If it is not removed,
the vane may restrict the flow of
water to all or part of the sprinkler
system.
