D770-53-00
3
I56-2617-001R
Operational Testing
Always notify the central station monitoring waterflow alarms before re-
pairing, maintaining or testing waterflow alarm devices.
1. Replace the cover and tighten the security screws with the security
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 ac-
tivated until the inspector’s test valve is closed. Air pockets in the
sprinkler system may increase the apparent time delay.
Maintenance
To prevent accidental water damage, control valves should be shut tight
and the system completely drained before waterflow detectors are re-
moved or replaced.
Inspect detectors monthly for leaks. If leaks are found, replace the detec-
tor. Test detectors at least quarterly as described under Operational Testing
above to insure proper operation. Test more often as required by appli-
cable codes or standards.
Under normal conditions System Sensor waterflow detectors should pro-
vide years of trouble-free service. If any part of the detector does not per-
form properly, replace the entire detector.
Failure to follow this instruction
may result in failure of the detector to report a waterflow condition.
Proceed as follows to remove a detector:
1. Drain the pipe.
2. Turn off electrical power to the detector, and then disconnect wiring.
3. Loosen nuts and remove U bolts.
4. Gently lift the saddle far enough to get your fingers under it. With
your fingers, roll the vane so it will fit through the hole while continu-
ing to lift the waterflow detector saddle.
5. Lift detector clear of pipe.
CAUTION
If a vane breaks off in a pipe, find and remove it. Failure to do so may
restrict the proper flow of water to part of the sprinkler system.
Figure 3. Assembly diagram:
Figure 4. Field wiring:
W0234-02
WFDE
B
B
COM
COM
WFDE
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
Cover
Tamper proof wrench
Delay mechanism
Pipe saddle
Plastic vane
Mounting plate
Roll paddle opposite
of flow arrow
while inserting
Saddle gasket
Waterflow
U bolt nut
Electrical conduit entrance
(22.2 mm dia.)
Terminal block
Pipe
U bolt
Refer to Table 2
MODEL
NUMBER
HOLE
DIAMETER
TORQUE
SETTING
WFD20E
31.8 mm +1.6 mm
1-1/4 in. +1/16 in
40.7 - 47.5 NT-M
30 - 35 FT-LBS
WFD25E
WFD30-2E
50.8 mm + 1.6 mm
2 in. +1/16 in.
74.6 - 81.3 NT-M
55 - 60 FT-LBS
WFD40E
WFD60E
WFD80E
W0101-02
