System Sensor WFDNA Series, WFD20NA, WFD25NA, WFD50NA, WFD60NA Installation And Maintenance Instruction

INSTALLATION AND MAINTENANCE INSTRUCTIONS

CAUTION

WARNING

CAUTION

CAUTION

WFDNA Series Vane-type Waterow

6581 Kitimat Road, Unit 6, Mississauga, Ontario L5N-3T5

Detectors

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: 2.6 in H x 3.5 in W x 6.7 in D
Operating Temperature Range: 32°F to 150°F (0°C to 66°C)
Compatible Pipe: Steel water pipe, schedule 7 through 40 (See chart below)
Shipping Weight: 3 to 6 lbs (according to size)
Enclosure Rating: NEMA Type 4, as tested by Underwriters Laboratories, Inc.
U. S. Patent Numbers: 5,213,205

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.

The model WFDNA is a vane-type waterflow detector for use in wet-pipe fire
sprinkler systems only. Vane-type waterflow detectors shall not be used as
the sole initiating device in both deluge and preaction systems; waterflow de­tectors used in these types of systems may result in an unintended discharge
caused by a surge, trapped air or a short retard time.

Installation must be performed by qualified personnel and in accordance with
all national and local codes and ordinances.

Shock hazard: Disconnect power source before servicing. Serious injury or
death could result.

Risk of explosion: Not for use in hazardous locations. Serious injury or
death could result.

PRINCIPLES OF OPERATION

Vane-type waterflow detectors mount to water-filled pipes in fire sprinkler
systems. Waterflow in the pipe deflects a vane, which produces a switched
output, usually after a specified delay. All WFDNA’s have a pneumatically
controlled mechanical delay mechanism. Delays do NOT accumulate; they
reset if the flow of water stops or drops below minimum triggering flow rate
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 Sensor installation manual covers the following waterflow detec­tors for fire sprinkler/fire alarm applications.

Model

WFD20NA 2 7 thru 40 450
WFD25NA 2.5 7 thru 40 450
WFD30NA 3 7 thru 40 450
WFD40NA 4 7 thru 40 450
WFD50NA 5 10 thru 40 450
WFD60NA 6 10 thru 40 450
WFD80NA 8 10 thru 40 450

Pipe Size

(inches)

Pipe

Schedule

Max. Pressure

Rating (psig)

Do NOT use any of the WFDNA 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 bi­metallic corrosion.

INSTALLATION GUIDELINES

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

NFPA 72: National Fire Alarm Code
NFPA 13: Installation of Sprinkler Systems, Sect. 3.17
NFPA 25: Inspection, Testing and Maintenance of Sprinkler Systems, Sect.

5.3.3.2
CAN/ULC S524: Installation of Fire Alarm Systems
Other applicable Canadian and NFPA standards, local codes, and the re-

quirements 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 associ­ated fire 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 the detector 6 to 7 feet above the floor to protect from accidental
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 the hous­ing and impair the operation of the detector. For vertical flow applications,
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 direc­tion of water flow and no less than 24 inches from a valve or drain.

5. Be sure the direction-of-flow arrows and directional cover match the direc­tion of flow in the pipe. See Figure 6.

MOUNTING INSTRUCTIONS

1. Drain the pipe.

2. Cut a hole in the pipe at the desired location. Center the hole on 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
prevent 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.

1-800-SENSOR2, FAX: [phone]

www.systemsensor.ca

SS-200-035 1 I56-4175-002

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

CAUTION

8.9 CM

WRONG

TAMPER PROOF

WARNING

scale and foreign matter from the inside of the pipe for a distance equal
to the pipe diameter on either 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.

4. Seat the gasket against the saddle and mount the detector directly to the
pipe. Carefully roll the vane opposite the direction of flow and insert it
through the hole (see Figure 3). Seat the saddle firmly against the pipe
so that the locating boss goes into the hole.

5. Install the U-bolt, tightening the nuts alternately to ensure a uniform seal
(see Table 1 for torque values).

6. Remove the 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 cause before proceeding.

Be sure the direction-of-flow arrow and directional cover point in the correct
direction or else water flow will go unreported. See Figure 3 and Figure 6.

FIGURE 1. MOUNTING DIMENSIONS:

(3.5")

6.6 CM
(2.6")

PIPE DIAMETER

PLUS 12.7 CM

UBOLT

NUT

PIPE

SADDLE

(5")

PRE-OPERATION TESTING

1. Fill the fire sprinkler system and check for leaks around the waterflow
detector. If it leaks, first check for the proper torque on the U-bolt nuts.
If the leak persists, drain the system and remove the detector (refer to
Maintenance). Check for dirt or foreign objects under the gasket, and
make sure that the 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 the COM and B-NO
switch terminals. The ohmmeter should indicate an open circuit.

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.

FIGURE 3. ASSEMBLY DIAGRAM:

WRENCH

MOUNTING PLATE

PIPE SADDLE

ROLL PADDLE

OPPOSITE OF
FLOW ARROW

WHILE INSERTING

(P/N WFDW)

COVER

TIMER
(REPLACEMENT
P/N FS-RT)

COVER TAMPER

SWITCH
(OPTIONAL P/N CTS)

ELECTRICAL
CONDUIT
ENTRANCE

U-BOLT
NUT

UBOLLT

OVERALL WIDTH = PIPE DIAMETER + 6.4 CM (2.5")

FIGURE 2. MOUNTING HOLE LOCATION:

REMOVE BURRS FROM EDGE OF HOLE. CLEAN OUT SCALE

AND FOREIGN MATTER FROM INSIDE WALL OF PIPE.

RIGHT

TABLE 1:

WFDNA MODEL HOLE SIZE (IN) TORQUE

20, 25 1

1

/4 30–35 ft.-lb.

40 2 45- 50 ft.-lb

30, 50, 60, 80 2 60- 65 ft.-lb.

PIPE

PIPE
VANE

W0384-00

W0106-00

SADDLE GASKET

PIPE

LOW

WATERF

REFER TO

T ABLE 1

U-BOLT

W0392-00

FIELD WIRING

1. All models have two SPDT switches. Switch contacts COM and B-NO
are closed when water is flowing and open when it is not. Connect the
switches, as shown in Figure 7, depending on the application.

2. When connected to a listed fire sprinkler/fire alarm control panel, the
initiating circuit must be unable to be silenced.

3. A ground screw is provided with all waterflow detectors. When ground­ing is required, clamp wire with screw in hole located between conduit
entrance holes. See Figure 4.

4. Use proper waterproof conduit fittings where required.

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 injury or death.

When utilizing switches at voltages greater than 74VDC or 49VAC

means to provide all–pole disconnection must be incorporated in the

fixed wiring, such as a circuit breaker.

SS-200-035 2 I56-4175-002