System Sensor AFDT and AFDTH - Manual (Page 4)

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 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 increase the apparent time
delay.
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 monthly for leaks. Test detectors at least month-
ly as described under Operational Testing above to insure proper
operation. This device is not designed for use on “dry pipe” sys-
tems. Test more often if required by the authority having jurisdic-
tion.
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 detector.
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 AFDT or AFDTH from tee fitting.
4. Lift detector clear off the pipe.
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.
CAUTION
Three-Year Limited Warranty
System Sensor warrants its enclosed waterflow detector to be free from defects in
materials 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 detector. 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 replace-
ment of any part of the waterflow detector which is found to be defective in materi-
als or workmanship under normal use and service during the three year period com-
mencing with the date of manufacture. After phoning System Sensor’s toll free num-
ber 800-SENSOR2 (736-7672) for a Return Authorization number, send defective
units postage prepaid to: System Sensor, Repair 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 exclu-
sion 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.
The Limitations of Waterflow Alarm Devices
WARNING
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 NFPA Standard 25.
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.
3. Vane-type waterflow detectors have a normal service life of 10-15 years. Hard water
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 sup-
ply should be sealed or locked in the normally open position. The normally open
position should be monitored by a sprinkler supervisory switch.
D770-34-00 4 I56-1621-004R
© 2002 System Sensor
Figure 11. Solid State Retard Timing Chart:
ON 1 2 3
Caution: Only use the above
timer settings. Timing
settings must not exceed
90 seconds.
Switch 1 Switch 2 Switch 3
Time (sec) (60 sec) (30 sec) (15 sec)
0 OFF OFF OFF
15 OFF OFF ON
30 OFF ON OFF
45 OFF ON ON
60 ON OFF OFF
75 ON OFF ON
90 ON ON OFF
Figure 9. Ground screw location:
Figure 10. Knockout plug removal:
GROUND
SCREW
(GREEN)
MOUNTING
PLATE
Please refer to insert for the Limitations of Fire Alarm Systems