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, following 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.
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.
WARNING
THE LIMITATIONS OF WATERFLOW ALARM DEVICES
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.
FIGURE 6. FIELD WIRING
UL-LISTED
COMPATIBLE
CONTROL PANEL
POWER
24VDC OR
120 VAC
SUGGESTED EOL
RESISTOR
SSM24-X
SSV120-X
NOTE: COMMON AND B-NO
CONNECTIONS WILL CLOSE
WHEN VANE IS DEFECTED,
I.E.,WHEN WATER IS FLOWING.
DUAL SWITCHES PERMIT
APPLICATIONS TO BE COMBINED
ON A SINGLE DETECTOR.
CONTACT RATINGS
SCHEMATIC OF
INDIVIDUAL
SWITCH IN
“NO WATERFLOW”
CONDITION
A-NC
COM
B-NO
BREAK WIRE AS
SHOWN FOR
SUPERVISION OF
CONNECTION. DO
NOT ALLOW
STRIPPED WIRE
LEADS TO EXTEND
BEYOND SWITCH
HOUSING. DO NOT
LOOP WIRES.
125 / 250 VAC
24 VDC
10 AMPS
2.5 AMPS
INITIATING
LOOP
W0393-02
UL LISTING LIMITATIONS
In accordance with the UL certification, the model WFDNFT has additional critical installa-
tion limitations when installed in sprinkler systems constructed of metallic pipe and fittings.
The model WFDNFT must be installed in accordance with the limitations for BlazeMaster
®
CPVC pipe and fittings, which limits the installation of the product to systems in Light Hazard
occupancies as defined in ANSI/NFPA 13, Residential occupancies as defined in ANSI/NFPA
13R, and Residential occupancies as defined in ANSI/NFPA 13D. All Listing limitations of
BlazeMaster
®
CPVC pipe and fittings as outlined in BlazeMaster
®
installation and design manuals
must be followed for model WFDNFT to be used in accordance with its Listing. These consider-
ations include, but are not limited to: (1) Acceptable installation limitations (concealed, exposed,
system risers); (2) Chemical compatibility; 3) Handling and storage; (4) Freeze protection and
proximity to heat sources.
THREE-YEAR LIMITED WARRANTY
SAFE SIGNAL warrants that the equipment herein shall conform to said descriptions as to all af-
firmation of fact and shall be free from defects of manufacture, labeling, and packaging for a pe-
riod of three (3) years from the invoice date to the original purchaser, provided that representative
samples are returned to SAFE SIGNAL for inspection. Upon a determination by SAFE SIGNAL
that a product is not as warranted, SAFE SIGNAL shall, at its exclusive option, replace or repair
said defective product or parts thereof at its own expense except that Purchaser shall pay all
shipping, insurance, and similar charges incurred in connection with the replacement of the
defective product or parts thereof. This Warranty is void in the case of abuse, misuse, abnormal
usage, faulty installation, or repair by unauthorized persons, or if for any other reason SAFE
SIGNAL determines that said product is not operating properly as a result of causes other than
defective manufacture, labeling, or packaging.
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