System Sensor WFD30EXP Installation And Maintenance Instructions page 3

Figure 3. Assembly diagram:
DELAY MECHANISM
(REPLACEMENT
P/N A3008-00)
PIPE SADDLE
PLASTIC VANE
ROLL PADDLE (VANE)
OPPOSITE OF FLOW ARROW
WHILE INSERTING
SADDLE GASKET
HOLE SIZE
(REFER TO CHART)
Figure 4. WFD wiring:
Switch 1
to nonsilenceable initiating
zone of listed FACP
COM
to power source
compatible
with bell
Typical Local Bell Connection
D770-24-00
COVER
SWITCH
ENCLOSURE
(REPLACEMENT
P/N A77-01-02)
GROUND SCREW
(GREEN)
CONDUIT
ENTRANCE
U-BOLT NUT
DIRECTION OF
FLOW ARROW
WFD Switch
Assembly
Top View
A B B A
Switch 2
WFD
WFD
B B B
B
COM
COM
Typical FACP Connection
(Multiple Detectors)
B
local
bell
COM
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 de-
tector to indicate a flow condition. The detector should remain acti-
vated 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 re-
moved or replaced.
Inspect detectors monthly for leaks and replace if a leak occurs. Test
detectors at least monthly, 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 pro-
vide years of trouble-free service. However, if the delay mechanism or
switch enclosure becomes faulty, replace it. To replace the delay mecha-
PIPE
nism or switch enclosure, use a
the three screws that hold it in place. Either mechanism can be easily re-
placed without removing the detector from the pipe or draining the pipe.
Do not repair or replace any other waterflow detector components. If any
U-BOLT other part of the detector does not perform properly, replace the entire de-
tector. Failure to follow this instruction may result in failure of the detector
to report the flow of water. To replace the delay mechanism, request Part
No. A3008-00. For switch enclosure, request Part No. A77-01-02.
A78-1914-11
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 continuing to lift the
waterflow detector saddle.
5. Lift the detector clear of the pipe.
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.
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.
CONTACT RATINGS
125/250 VAC 10 AMPS
24 VDC 2.5 AMPS
end-of-line resistor
COM
Break wire as shown for
supervision of connection.
DO NOT allow stripped wire
leads to extend beyond
switch housing. Do NOT
loop wires.
3
" socket head screwdriver to remove
3
/
16
CAUTION
A78-1586-00
I56-1452-002