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D770-24-00 1 I56-1452-005R

WFDEXP Explosion Proof

Vane-type Waterﬂow Detectors

INSTALLATION AND MAINTENANCE INSTRUCTIONS

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

www.systemsensor.com

IMPORTANT

Please Read Carefully And Save

This instruction manual contains important information about the installation

and 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.

CAUTION

Use vane-type waterflow detectors in wet-pipe systems only. Do NOT use

them in dry pipe, deluge, or preaction systems. The sudden inrush of water in

such systems may break the vane or damage the mechanism.

PRINCIPLES OF OPERATION

Vane-type waterflow detectors mount to water-filled pipes in sprinkler systems.

Waterflow in the pipe deflects a vane, which produces a switched output–

usually after a specified delay. All waterflow detectors have a pneumatically

controlled mechanical delay mechanism. Delays do NOT accumulate; they re-

set if the flow of water stops before the entire delay has elapsed. All switches

actuate when the water flow rate is 10 gallons per minute or greater, but will

not 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)

Pipe

Schedule

Max. Pressure

Rating (psig)

WFD20EXP 2 10 thru 40 450

WFD25EXP 2.5 10 thru 40 450

WFD30-2EXP 3 10 thru 40 450

WFD35EXP 3.5 10 thru 40 450

WFD40EXP 4 10 thru 40 450

WFD50EXP 5 10 thru 40 450

WFD60EXP 6 10 thru 40 450*

WFD80EXP 8 10 thru 40 450*

*Maximum Pressure Rating 400 psig as approved by Factory Mutual Research.

CAUTION

Do NOT use any of the WFD models on copper pipe. The clamping forces of

the mounting bolts may collapse the pipe sufficiently to prevent the detector

from functioning properly.

Do NOT install steel or iron pipe sections in copper piping for mounting a

waterflow detector. Incompatibility between the dissimilar metals causes bi-

metallic corrosion.

NOTE: Not for use in potable water systems, systems where sand or other

material is present or systems employing other than water.

SPECIFICATIONS

Contact Ratings: 10 A @ 125/250 VAC ; 2.5 A @ 24 VDC

Triggering Threshold Bandwidth (Flow Rate): 4 to 10 gpm

Static Pressure Rating: See models listed below

Dimensions (Installed): 4.0 in H × 8.8 in W × 7.0 in D

Operating Temperature Range: 32°F to 120°F (0°C to 49°C)

Compatible Pipe: Steel water pipe, schedule 10 or 40

Shipping Weight: According to size

Enclosure Rating: NEMA 4 indoor/outdoor use

Hazardous Atmosphere Classification: Class I, Groups B, C, D Div, 1; Class II, Groups E, F, G Div. 1; Class III Div. 1

US Patent Number: 5,213,205

INSTALLATION GUIDELINES

Before installing any waterflow alarm device, be thoroughly familiar with:

NFPA 72: National Fire Alarm Code

NFPA 13: Installation of Sprinkler Systems, Section 3.17

NFPA 25: Inspection, Testing and Maintenance of Sprinkler Systems, Section

5.3.3.2

Other applicable NFPA standards, local codes, and the requirements of the

authority having jurisdiction

NOTE: Installation methods other than those listed in this installation manual

may 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 responsible

for devices that have been improperly installed, tested, or maintained.

1. Mount the detector where there is adequate clearance for installation and

removal and a clear view of it for inspections. See Figure 1 for mounting

dimensions.

2. Locate to protect from damage – 6 to 7 feet above the floor.

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 the

housing and impair the operation of the detector. For vertical flow appli-

cations, mount the detector on pipe through which water 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.

CAUTION

Contact the appropriate personnel regarding the proper tools and procedures

when installing this device in a “HAZARDOUS” area. Disconnect supply cir-

cuits before opening the cover, to reduce the chances of ignition of hazardous

atmospheres. Secure the cover and cover screws prior to activating circuits.

Tighten cover screws to 40 in. lbs. min.

MOUNTING INSTRUCTIONS

1. Drain the pipe.

2. Cut a hole at the desired location. Center the hole in the pipe, as shown

in Figure 2, and be sure the hole is perpendicular to the center of the

pipe. 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 bind

against the inside wall of the pipe. Use a drill or hole saw to cut a hole of

the proper diameter. See Table 1 for hole size.

CAUTION

When drilling the hole with a hole saw, make certain that the center of the cut

does not remain in the pipe.

3. Remove burrs and sharp edges from the hole. Clean and remove all scale

and foreign matter from the inside of the pipe for one diameter on each

side of the hole to ensure free movement of the vane. Clean the outside

of the pipe to remove dirt, metal chips, and cutting lubricant.

I56-1452-005R

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Indice de contenidos

Pagina 1 - Vane-type Waterﬂow Detectors

D770-24-00 1 I56-1452-005RWFDEXP Explosion Proof Vane-type Waterﬂow DetectorsINSTALLATION AND MAINTENANCE INSTRUCTIONS 3825 Ohio Avenue, St. Charles

Pagina 2 - W0183-00

4. Seat the O-ring or gasket against the saddle and mount the detector di-rectly to the pipe. Carefully roll the vane opposite the direction of flow

Pagina 3 - W0112-02

D770-24-00 3 I56-1452-005RFIGURE 4. WFD WIRING:++––SSM24-XSSV120-XNOTE: COMMON AND B-NO CONNECTIONS WILL CLOSE WHEN VANE IS DEFLECTED, I.E., WHEN WA

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