System Sensor WFD20A Installation Instruction

D770-44-00 1 I56-2338-004RWfDa vane-type Waterflow DetectorsinsTaLLaTion anD mainTenance insTrUcTionsimporTanTPlease Read Carefully And SaveThis instruction manual contains important information about the installationand operation of waterflow detectors. Purchasers who install waterflow detec-tors for use by others must leave this manual or a copy of it with the user.Read all instructions carefully before beginning. Follow only those instruc-tions that apply to the model you are installing.CAUTIONUse vane-type waterflow detectors in wet-pipe systems only. Do NOT usethem in dry pipe, deluge, or pre action systems. The sudden inrush of water insuch systems may break the vane or damage the mechanism.Do not use in potentially explosive atmospheres. Do not allow unused wiresto remain exposed.principLes of operaTionVane-type waterflow detectors mount to water-filled pipes in sprinkler sys-tems. Waterflow in the pipe deflects a vane, which produces a switched output–usually after a specified delay. All waterflow detectors have a pneumaticallycontrolled mechanical delay mechanism. Delays do NOT accumulate; they re-set if the flow of water stops before the entire delay has elapsed. All switchesactuate when the water flow rate is 10 gallons per minute or greater, but willnot actuate if the flow rate is less than 4 gallons per minute. This System Sen-sor installation manual covers the following waterflow detectors for sprinkler/fire alarm applications.Model Pipe Size(inches)PipeScheduleMax. PressureRating (psig)WFD20A 2 (50 mm) 10 thru 40 450WFD25A 2.5 (65 mm) 10 thru 40 450WFD30-2A 3 (80 mm) 10 thru 40 450WFD40A 4 (100 mm) 10 thru 40 450WFD50A 5 (130 mm) 10 thru 40 450WFD60A 6 (150 mm) 10 thru 40 450*WFD80A 8 (200 mm) 10 thru 40 450**Max Pressure Rating 400 psig as Approved by Factory Mutual Research.CAUTIONDo NOT use any of the WFDA models on copper pipe. The clamping forces ofthe mounting bolts may collapse the pipe sufficiently to prevent the detectorfrom functioning properly.Do NOT install steel or iron pipe sections in copper piping for mounting awaterflow detector. Incompatibility between the dissimilar metals causes bi-metallic corrosion.specificaTionsContact Ratings: 10 A @ 125/250 VAC ; 2.5 A @ 24 VDCCover Tamper Switch Ratings: 5 A @ 125/250 VAC; 2.5 A @ 24 VDCTriggering Threshold Bandwidth (Flow Rate): 4 to 10 gpmStatic Pressure Rating: See models listed belowDimensions, Installed: 3.5 in H × 3.0 in W × 6.7 in DOperating Temperature Range: 0°C to 49°C (32°F to 120°F)Compatible Pipe: Steel water pipe, schedule 10 through 40Shipping Weight: 4 to 7 lbs, according to sizeAll WFDA waterflow detectors are ULC approved. U.S. Patent Numbers: 5,213,205insTaLLaTion gUiDeLinesBefore installing any waterflow alarm device, be thoroughly familiar with:NFPA 72: National Fire Alarm CodeNFPA 13: Installation of Sprinkler SystemsNFPA 25: Inspection, Testing and Maintenance of Sprinkler Systems,Section 5.3.3.2CAN/ULC S524Other applicable NFPA standards, local codes, and the requirements of theauthority having jurisdictionNOTE: Installation methods other than those listed in this installation manualmay prevent the device from reporting the flow of water in the event the asso-ciated sprinkler system is activated by a fire. System Sensor is not responsiblefor devices that have been improperly installed, tested or maintained.1. Mount the detector where there is adequate clearance for installation andremoval and a clear view of it for inspections. See Figure 1 for mountingdimensions.2. Locate the detector 6 to 7 ft. above the floor to protect from acciden-tal damage.3. On horizontal runs, position the detector on the top or side of the pipe.Do not mount it upside down because condensation may collect in thehousing and impair the operation of the detector.For vertical flow applications, mount the detector on pipe through whichwater flows upward. Otherwise, the unit may not operate properly.4. Mount the detector at least 6 inches from a fitting that changes the direc-tion of water flow and no less than 24 inches from a valve or drain.5. Be sure the direction-of-flow arrow matches the direction of flow in the pipe.moUnTing insTrUcTions1. Drain the pipe.2. Cut a hole at the desired location. Center the hole in the pipe, as shownin Figure 2, and be sure the hole is perpendicular to the center of thepipe. Before drilling, use a punch or scribe to mark the drill site to pre-vent the bit from slipping. If the hole is off center, the vane will bindagainst the inside wall of the pipe. Use a drill or hole saw to cut a hole ofthe proper diameter. See Table 1 for hole size.CAUTIONWhen drilling the hole with a hole saw, make certain that the center of the cutdoes not remain in the pipe.3. Remove burrs and sharp edges from the hole. Clean and remove all scaleand foreign matter from the inside of the pipe for one diameter on eachside of the hole to ensure free movement of the vane. Clean the outsideof the pipe to remove dirt, metal chips, and cutting lubricant.4. Seat the gasket against the saddle and mount the detector directly to thepipe. Carefully roll the vane opposite the direction of flow and insert itthrough the hole. Seat the saddle firmly against the pipe so that the locat-ing boss goes into the hole.5. Install the U-bolt, tightening the nuts alternately to ensure a uniformseal. See Table 1 for torque values.3825 Ohio Avenue, St. Charles, Illinois 601741-800-SENSOR2, Fax: 630-377-6495www.systemsenor.comI56-2338-004R

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