System Sensor WFD Explosion Proof - Manual (Page 3)

D770-24-00 3 I56-1452-005R
fiGUre 4. Wfd WirinG:
+
+
–
–
SSM24-X
SSV120-X
NOTE: COMMON AND B-NO
CONNECTIONS WILL CLOSE
WHEN VANE IS DEFLECTED, I.E.,
WHEN WATER IS FLOWING. DUAL
SWITCHES PERMIT
APPLICATIONS TO BE COMBINED
ON A SINGLE DETECTOR.
BREAK WIRE AS
SHOWN FOR
SUPERVISION OF
CONNECTION. DO
NOT ALLOW
STRIPPED WIRE
LEADS TO EXTEND
BEYOND SWITCH
HOUSING. DO NOT
LOOP WIRES.
POWER
24VDC OR
120VDC
INITIATING
LOOP
UL LISTED
COMPATIBLE
CONTROL PANEL
CONTACT RATINGS
125/250 VAC
24 VDC
10 AMPS
2.5 AMPS
SCHEMATIC OF
INDIVIDUAL
SWITCH IN
“NO WATERFLOW”
CONDITION
SUGGESTED EOL
RESISTOR
B-NO
COM
A-NC
W0356-00
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, counterclockwise
to decrease it. The delay is adjustable from 0 to 90 seconds. See Figure 5.
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, reducing 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.
oPeraTionaL TesTinG
Always notify a central station monitoring waterflow alarms before repairing,
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 detec-
tor to indicate a flow condition. The detector should remain activated un-
til 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 de-
tectors 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 en-
closure needs to be replaced, follow these directions. To replace the delay
mechanism or switch enclosure, use a
3 ⁄
16
-inch socket head screwdriver 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 enclo-
sure, 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 prop-
erly, 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. Sys-
tem Sensor is not responsible for devices that have been improperly installed,
tested, or maintained.
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 water-
flow detector 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.
fiGUre 5. deLaY adjUsTmenT diaL:
DELAY
ADJUSTMENT
DIAL
55
70
0
15
45
30
TI
ME
DE
LAY IN SECO
ND
S
NU
MB
ER
ON
DIAL IS APPRO
XIM
AT
E
NOTE: RETARD TIME MAY EXCEED 90 SECONDS. ADJUST
AND VERIFY THAT TIME DOES NOT EXCEED 90 SECONDS.
NUMBER ON DIAL IS APPROXIMATE TIME DELAY IN
SECONDS WITH AN ACCURACY OF +/− 50%.
W0112-02