System Sensor WFD User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

CAUTION

CAUTION

CAUTION

CAUTION

3825 Ohio Avenue, St. Charles, Illinois 60174

WFDE Vane-type Waterflow Detector

SPECIFICATIONS

Contact Ratings: 10 A @ 125/250 VAC~; 2.5 A @ 24 VDC EC–certificate Number: 0786-CPD-40151
Triggering Flow Rate: Refer to Table 1 EN12259–5
Static Pressure Rating (maximum): 17.25 bar (250 psi) (1725 KPa); 16 bar (VdS)
Operating Temperature Ranges: 0°C to 68°C (32°F to 155°F)
Compatible Pipe: Steel Water Pipe (Refer to Table 1)
Shipping Weight: 1.8 – 3.2 Kilograms
Enclosure Rating: Nema4/IP54

IMPORTANT

Please Read Carefully And Save

This instruction manual contains important information about the installation
and operation of waterflow detectors. Purchasers who install waterflow detec­tors 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 instruc­tions that apply to the model you are installing.

Use vane-type waterflow detectors in wet-pipe systems only. DO NOT USE IN
DRY-PIPE, DELUGE, OR PRE-ACTION SYSTEMS. The sudden inrush of water
in such systems may break the vane or damage the mechanism.

Do not use in potentially explosive atmospheres. Do not leave unused
wires exposed.

PRINCIPLES OF OPERATION

Vane type waterflow detectors mount to water-filled pipes in sprinkler sys­tems. Waterflow in the pipe deflects a vane. Deflection of the vane produces a
switched output, usually after a specified delay. All WFDEs have a pneumati­cally controlled mechanical delay mechanism. Delays are noncumulative; they
reset if the flow of water stops or drops below minimum triggering flow rate
before the entire delay has elapsed. All detectors will activate on a sustained
flow of water greater than the maximum specified in Table 1, but will not acti­vate if the flow rate is less than the minimum specified in Table 1.

This System Sensor installation manual covers the following waterflow detec­tors for sprinkler/fire alarm applications.

TABLE 1:

VdS LPCB

Model

Number

WFD20E 50 (2) 60.3 2.3/2.9
WFD25E 66 (2,5) 76.1 2.6/2.9 76.0 3.6

WFD30-2E 80 (3) 88.9 2.9/3.2 88.8 4.0

WFD40E 100 (4) 114.3 3.2/3.6 114.1 4.5
WFD60E 150 (6) 168.3 4.0/4.5 165.1 5.0
WFD80E 200 (8) 219.1 4.5/5.9 219.1 6.3

DN Ref.

Pipe Size

mm (in)

Nominal

Pipe
O.D.

(mm)

Wall

Thickness

(mm)

Triggering
Flow Rate
(liters/min)

30-57

Nominal

Pipe O.D.

(mm)

60.3 3.6

Wall

Thickness

(mm)

STEEL PIPE COMPATIBILITY

DO NOT USE THE ABOVE 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 will cause bimetallic corrosion.

INSTALLATION GUIDELINES

Before installing any waterflow alarm device, be thoroughly familiar with national
codes of practice and the requirements of the authority having jurisdiction.

Failure to follow these directions may result in failure of the device to report
a waterflow condition. System Sensor is not responsible for devices that have
been improperly installed, tested or maintained.

D770-53-00 1 I56-2617-004R

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 the unit 1.8 – 2.1 meters above the floor to protect from damage.

3. On horizontal runs, position the detector on top or on the 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 ap­plications, mount detector on pipe where upflow conditions exist. Failure
to do so may prevent unit from operating properly.

4. Mount detector at least 15 cm from a fitting which changes the direction
of the water flow, or no closer than 61 cm from a valve or drain.

5. BE SURE DIRECTION-OF-FLOW ARROW MATCHES ACTUAL DIREC­TION OF FLOW IN THE PIPE.

MOUNTING INSTRUCTIONS

1. Drain the pipe.

2. Cut a hole in 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. 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 2 for hole size. Before drilling, use a punch or scribe to mark the
drill site to keep the bit from slipping.

When drilling out hole, make certain that center of hole saw cut does not
remain in pipe.

TABLE 2:

MODEL NUMBER HOLE DIAMETER TORQUE SETTING

WFD20E

WFD25E

31.8 mm +1.6 mm
11/4 in +1/16 in

WFD30-2E

WFD40E

50.8 mm + 1.6 mm

WFD60E

WFD80E

3. Remove burrs and sharp edges from hole. Clean out scale and foreign mat­ter from inside wall of pipe to ensure free movement of the vane. Clean the
outside of the pipe to remove dirt, metal chips, and cutting lubricant.

4. Seat the saddle gasket against the saddle and mount detector directly to
pipe. Carefully roll the vane opposite the direction of flow and insert it
through the hole (see Figure 5). Seat the saddle firmly against the pipe so
that the locating boss goes into the hole.

5.

Install the U-bolt around the pipe. Thread both nuts onto the U-bolt and tighten
them alternately to ensure a uniform seal. See Table 2 for torque values.

6. Remove the metal 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.

Be sure the direction-of-flow arrow points in the correct direction, otherwise a
waterflow condition will go unreported. See Figure 5.

1-800-SENSOR2, FAX: [phone]

www.systemsensor.com

40.7 - 47.5 NT-M
30 - 35 FT-LBS

74.6 - 81.3 NT-M

2 in +1/16 in

55 - 60 FT-LBS

I56-2617-004R

FIGURE 1. MOUNTING DIMENSIONS:

9.5 CM

OVERALL WIDTH = PIPE DIAMETER + 7.6 CM (3˝)

WRONG

AND FOREIGN MATTER FROM INSIDE WALL OF PIPE.

WARNING

(33/4˝)

7.6 CM
(3˝)

PIPE DIAMETER

PLUS 13.3 CM

1

/4˝)

U-BOLT

(5

NUT

PIPE

SADDLE

PIPE

PIPE

VANE

U-BOLT

W0105-00

FIGURE 2. LOCATION OF MOUNTING HOLE:

RIGHT

REMOVE BURRS FROM EDGE OF HOLE. CLEAN OUT SCALE

W0106-00

PREOPERATION TESTING

1. Fill the sprinkler system and check for leaks around the WFDE. If it
leaks, first check for proper torque on U-bolt nuts. If leak persists, drain
the system and remove the detector (see removal instructions under
Maintenance). Check for dirt or foreign objects under the gasket. Check
that pipe surface is not dented. Reinstall the detector and check again for
leaks. Do not proceed until all leaks have been stopped.

2. Connect an ohmmeter or continuity tester across (COM and B-NO) termi­nal switch contacts (see Figure 3). The ohmmeter should show an open
circuit, no continuity.

3. Deflect the actuator lever and hold it until the pneumatic delay shaft
releases the switch buttons. The ohmmeter or continuity tester should
show a short circuit after the delay has elapsed. If there is no delay,
check the setting of the delay adjustment dial.

FIELD WIRING

1. All models have two SPDT switches. Switch contacts (COM and B-NO) are
closed when water is flowing and open when water is not flowing. Con­nect the switches as shown in Figure 3 depending on the application.

2. When connected to a listed sprinkler/fire alarm control panel, the initiat­ing circuit must be non-silenceable.

3. A ground screw is provided with all WFDE units. When grounding is re­quired, clamp wire with screw in hole located between conduit entrance
holes, see Figure 6.

4. Use proper waterproof conduit fittings where required.

5. A 22.2 mm conduit hole is provided for electrical connection. An additional

22.2 mm diameter knockout is provided for multiple line connections.

High Voltage. Electrocution Hazard. Do not handle live AC wiring or work on a de­vice 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 wiring, such as a circuit breaker.

FIGURE 3. FIELD WIRING:

UL-LISTED
COMPATIBLE
CONTROL PANEL

LOOP

+

–

+

–

POWER
24VDC OR
120VAC

INITIATING

SSV120-X

SUGGESTED EOL

RESISTOR

SSM24-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.

CONTACT RATINGS

125/250 VAC

24 VDC

SCHEMATIC OF
INDIVIDUAL
SWITCH IN
“NO WATERFLOW”
CONDITION

BREAK WIRE AS
SHOWN FOR
SUPERVISION OF
CONNECTION. DO
NOT ALLOW
STRIPPED WIRE
LEADS TO EXTEND
BEYOND SWITCH
HOUSING. DO NOT
LOOP WIRES.

10 AMPS

2.5 AMPS

A-NC

COM

B-NO

W0356-01

MECHANICAL DELAY ADJUSTMENT

The pneumatic delay is preset at dial setting 25 at the factory. To adjust the
delay, turn the adjustment dial on the delay mechanism. Turn clockwise to
increase the delay, counterclockwise to decrease the delay. Delay can be ad­justed over a range from 0 to 30 seconds maximum, see Figure 4.

NOTE: Set the delay to the minimum required to prevent false alarms due to
flow surges.

After extended service, parts of the detector may become worn reducing the
delay time and causing false alarms. If this happens, increase the delay.

FIGURE 4. DELAY ADJUSTMENT DIAL:

DELAY

ADJUSTMENT

DIAL

0

5

10

25

20

15

DIAL SETTING

0

DIAL SETTING EQUALS DELAY IN SECONDS REFERENCE ONLY.

10 15 25

5

20

W0102-04

D770-53-00 2 I56-2617-004R