System Sensor WFDTNR - Manual (Page 2)

through hole in paddle until it seats firmly to actuator lever surface. No
washer is required. For paddle replacement refer to Maintenance section.
3. Thread detector onto tee fitting and tighten with wrench. Use of thread
sealant or tape is recommended. Use height gage (located at end of pad-
dle tree) to ensure proper depth of detector on tee fitting. See Figure 1.
Height gage must fit between top of tee fitting and under side of hex tee
adapter. A gap between gage and tee adapter is acceptable. When cor-
rectly installed, the detector must face in the proper direction of water-
flow and be aligned with the pipe.
4. Remove the plastic cover with the tamper proof wrench provided. Move
the actuator lever back and forth to check for binding. If the vane binds,
remove the detector and correct the problem before proceeding.
CAUTION
Be sure the direction-of-flow arrow points in the correct direction, otherwise a
waterflow condition will go unreported. See Figure 2.
OpERATIONAL TESTINg
Always notify a central station monitoring waterflow alarms before repairing,
maintaining, or testing waterflow alarm devices.
1. Fill the sprinkler and check for leaks around the WFDTNR. If it leaks,
check to see that the fittings are tight. If leak persists, drain the system
and remove the detector (see removal instructions under Maintenance).
Check for damaged threads or cracked fitting. Reinstall detector and
check again for leaks. Do not proceed until all leaks have been stopped.
2. With cover removed, connect an ohmmeter or continuity tester across
(COM and B-NO) terminal switch contacts. The ohmmeter should show an
open circuit, no continuity (when the red switch buttons are depressed).
3. Deflect the actuator lever to release the switch buttons. The ohmmeter or
continuity tester should show a short circuit when the switch buttons are
released.
4. Open the inspector’s test valve to allow 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 prevent the de-
tector from firing immediately.
5. Replace the cover and tighten the security screws with the tamper proof
wrench. Store wrench is a secure place.
FIELD WIRINg
1. The WFDT has two SPDT switches. Switch contacts (COM and B-NO) are
closed when water is flowing and open when water is not flowing. Con-
nect the switches as shown in Figure 3 depending on the application.
2. When connected to a listed sprinkler/fire alarm control panel, the initiat-
ing circuit must be non-silenceable.
3. A ground screw is provided with all WFDT units. When grounding is re-
quired, clamp wire with screw in hole located between conduit entrance
holes. See Figure 2.
WARNING
High Voltage. Electrocution Hazard. Do not handle live AC wiring or work on a de-
vice to which AC power is applied. Doing so may result in severe injury or death.
When utilizing switches at voltages greater than 74VDC or 49VAC
means to provide all–pole disconnection must be incorporated in the field wir-
ing, such as a circuit breaker.
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
W0372-00
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 to insure proper operation. This
device is not designed for use on “dry pipe” systems. Test more often if re-
quired by the authority having jurisdiction.
Under normal conditions System Sensor waterflow detectors should provide
years of trouble-free service. If, however, the switch enclosure becomes faulty,
request Part No. A77-01-08. If damage occurs to paddle, order replacement
kit PRK9. Refer to procedure below for removal of detector on pipe. Do not
repair or replace any other waterflow detector components in the field. If any
other part of the detector does not perform properly, replace the entire detec-
tor. 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 WFDTNR from tee fitting
N770-06-00 2 I56-0509-009R
©2007 System Sensor
System Sensor warrants its enclosed waterflow detector to be free from defects in materi-
als and workmanship under normal use and service for a period of three years from date
of manufacture. System Sensor makes no other express warranty for this waterflow detec-
tor. No agent, representative, dealer, or employee of the Company has the authority to
increase or alter the obligations or limitations of this Warranty. The Company’s obligation
of this Warranty shall be limited to the repair or replacement of any part of the waterflow
detector which is found to be defective in materials or workmanship under normal use
and service during the three year period commencing with the date of manufacture.
After phoning System Sensor’s toll free number 800-SENSOR2 (736-7672) for a Return
Authorization number, send defective units postage prepaid to: System Sensor, Return
1. Waterflow detectors may not work or operate properly if sprinkler piping being
monitored is plugged with pipe scale, mud, stones or other foreign material.
Sprinkler systems should be checked regularly for such blocking material, fol-
lowing the instructions in Chapter 5 of NFPA Standard 13A.
2. Alarms generated by the activation of waterflow detectors may not be received
by a central station if telephone or other communication lines to the detector
are out of service, disabled, or open.
WARNING
ThE LIMITATIONS OF WATERFLOW ALARM DEVICES
3. Vane-type waterflow detectors have a normal service life of 10-15 years. Hard wa-
ter systems, however, may substantially reduce waterflow detector service life.
4. Waterflow detectors are not a substitute for insurance. Building owners should
always insure property and lives being protected by sprinkler systems.
5. If valves controlling the water supply to a sprinkler system are closed, vane-
type waterflow detectors will not work. All valves controlling a sprinkler water
supply should be sealed or locked in the normally open position. The normally
open position should be monitored by a sprinkler supervisory switch.
ThREE-yEAR LIMITED WARRANTy
Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174. Please include a
note describing the malfunction and suspected cause of failure. The Company shall not
be obligated to repair or replace units which are found to be defective because of damage,
unreasonable use, modifications, or alterations occurring after the date of manufacture.
In no case shall the Company be liable for any consequential or incidental damages for
breach of this or any other Warranty, expressed or implied whatsoever, even if the loss
or damage is caused by the Company’s negligence or fault. Some states do not allow the
exclusion or limitation of incidental or consequential damages, so the above limitation
or exclusion may not apply to you. This Warranty gives you specific legal rights, and you
may also have other rights which vary from state to state.
Please refer to insert for the Limitations of Fire Alarm Systems