System Sensor WFDT and WFDTH - Manual (Page 3)

N770-05-00 3 I56-0480-013R
figUre 3. fieLD 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 30 seconds at the factory. To adjust the delay,
turn the adjustment dial on the delay mechanism. Turn clockwise to increase
the delay, counterclockwise to decrease the delay. Delay can be adjusted over
a range from 0-90 seconds. See Figure 4.
NOTE: Set the delay to the minimum required to prevent false alarms due to
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 maximum, replace the mechanical delay assembly. Refer to
Maintenance section 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 security 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 time delay.
figUre 4. 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
mainTenance
To prevent accidental water damage, control valves should be shut tightly
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. Test detectors at least quar-
terly as described under Operational Testing above to insure proper operation.
This device is not designed for use on “dry pipe” systems. Test more often if
required by the authority having jurisdiction.
Under normal conditions System Sensor waterflow detectors should provide
years of trouble-free service. If, however, the delay mechanism becomes faulty,
replacement kits are available. To replace the delay mechanism, request Part
No. A3008-00; for switch enclosure, request Part No. A77-01-02. Complete
instructions are enclosed with each. Either mechanism can be easily replaced
without removing the detector from the pipe or draining the pipe. If damage
occurs to paddle, order replacement kit PRK9. Refer to procedure below for re-
moval of detector on pipe. Do not repair or replace any other waterflow detec-
tor components in the field. If any other part of the detector does not perform
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. Unscrew WFDT or WFDTH from tee fitting.
4. 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.