System Sensor WFD Series, WFD20, WFD25, WFD30, WFD35 Installation And Maintenance Instructions Manual
...
INSTALLATION AND MAINTENANCE INSTRUCTIONS
WFD Vane-type Waterflow
3825 Ohio Avenue, St. Charles, Illinois 60174
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: 250 PSI (Max) 2" – 8"
Dimensions, Installed: 3.5"H x 3.0"W x 6.7"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: 4 to 7 lb., according to size.
Enclosure Rating: NEMA 4, as tested by Underwriters Laboratories, Inc.
(requires optional Outdoor Cover Gasket Model WFDN4 and cover part #C58-164-01)
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.
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 reset 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.
1-800-SENSOR2, FAX: 630-377-6495
A Division of Pittway
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.
Do not use in potentially explosive atmospheres. Do not allow unused wires to remain exposed.
This System Sensor installation manual covers the following waterflow detectors for sprinkler/fire alarm applications.
Models
WFD20 Waterflow detector, Schedule 10/40, 2"
WFD25 Waterflow detector, Schedule 10/40, 2-1/2"
WFD30 Waterflow detector, Schedule 10/40, 3"
WFD35 Waterflow detector, Schedule 10/40, 3-1/2"
WFD40 Waterflow detector. Schedule 10/40, 4"
WFD50 Waterflow detector, Schedule 10/40, 5"
WFD60 Waterflow detector, Schedule 10/40, 6"
WFD80 Waterflow detector, Schedule 10/40, 8"
D770-01-00 1 I56-459-07
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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 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, Section 3.17
NFPA 25: Inspection, Testing and Maintenance of Sprin-
kler Systems
Other applicable NFPA standards, local codes, and the requirements of the authority having jurisdiction
Failure to follow these directions may prevent the device
from reporting the flow of water in the event the associated
sprinkler system is activated by a fire. System Sensor is not
responsible for devices that have been improperly installed,
tested, or maintained.
Figure 1. Mounting dimensions:
3-3/4"
3"
U-bolt nut
Pipe saddle
U-bolt
Overall width = pipe diameter + 3"
Pipe diameter
plus 5-1/4"
Pipe
Plastic vane
A78-1609-00
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 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 arrow matches the direction
of flow in the pipe.
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 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.
Figure 2. Mounting hole location:
Wrong
Right
Remove burrs from edge of hole. Clean out scale and foreign
matter for one pipe diameter on each side of hole.
A78-1496-01
D770-01-00 2 I56-459-07
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Table 2:Table 1:
WFD SIZE Hole Size
2" - 3-1/2
4" - 8
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.
4. Seat the O-ring or 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. 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 en-
sure 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 cause before proceeding.
Be sure the direction-of-flow arrow points in the right direction or else water flow will go unreported. See Figure 3.
Preoperation Testing
1. Fill the 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.
page 6). 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 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.
"
"
CAUTION
1-1/4
2
"
"
CAUTION
Wiring
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.
1. All models have two SPDT switches. Switch contacts
COM and B are closed when water is flowing and open
when it is not. Connect the switches, as shown in Figure
4 on page 5, depending on the application.
2. When connected to a listed sprinkler/fire alarm control
panel, the initiating circuit must be nonsilenceable.
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
5A, page 5.
4. If a second conduit entry is required, remove the knockout plug using a flat blade screwdriver as shown on Figure 5B, page 5. Strike sharply with a hammer to pierce
the wall of the knockout plug. Move to an adjacent wall
section and repeat until the plug falls out. Make sure
that the waterflow detector is supported adequately during this operation to avoid injury.
WFD SIZE Torque
2" - 3-1/2
4" - 8
"
"
WARNING
30 - 35 ft-lb
55 - 60 ft-lb
D770-01-00 3 I56-459-07
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Figure 3. Assembly diagram:
Cover
Tamper proof wrench
(P/N WFDW)
Switch enclosure
(Replacement P/N A77-01-02)
Delay mechanism
(Replacement
P/N A3008-00)
Mounting plate
Pipe saddle
Roll paddle opposite
of flow arrow
while inserting
Saddle gasket
Plastic vane
Conduit entrance
Direction-of-flow arrow
U-bolt nut
Pipe
Waterflow
WFD Size
"
– 3-1/2"
2
4
"
– 8
D770-01-00 4 I56-459-07
"
Hole Size
1-1/4"
2
"
U-bolt
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A78-1914-00
Figure 4. WFD wiring:
WFD Switch
Assembly
Top View
to nonsilenceable initiating
zone of listed FACP
to power source
compatible
with bell
Switch 1
COM
ABBA
WFD
B
B
COM
COM
Typical FACP Connection
(Multiple Detectors)
B
COM
Typical Local Bell Connection
COM
local
bell
COM
B
NOTE: Common and B connections will
close when vane is deflected, i.e.,
when water is flowing. Dual switches
permit applications to be combined
on a single detector.
Switch 2
CONTACT RATINGS
125/250 VAC
24 VDC
WFD
B
end-of-line resistor
COM
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
Figure 5A. Ground screw location: Figure 5B. Knockout plug removal:
GROUND
SCREW
(GREEN)
MOUNTING
PLATE
A78-1586-00
A78-1914-03A78-2063-00
D770-01-00 5 I56-459-07
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Mechanical Delay Adjustment
The pneumatic delay is preset at the factory to dial setting
2. To adjust the setting, turn the adjustment dial clockwise
to increase the delay, counterclockwise to decrease it. The
delay is adjustable from 0 to 70 seconds. See Figure 6.
NOTE: Set the delay to the minimum required to prevent
false alarms from flow surges.
Maintenance
To prevent accidental water damage, control valves
should be shut tight and the system completely drained
before waterflow detectors are removed or replaced.
Inspect detectors monthly for leaks and replace if a leak
occurs. Test detectors at least monthly, as described under
Operational Testing, to ensure proper operation. Test more
often if required by the authority having jurisdiction.
After extended service, parts of the detector may become
worn, reducing the delay time and causing false alarms. If
this happens, increase the delay. If the delay is already at
the maximum, replace the mechanical delay assembly. Refer to Maintenance for ordering replacement parts.
Operational Testing
Always notify a central station monitoring waterflow
alarms before repairing, maintaining, or testing waterflow
alarm devices.
1. Replace the cover and tighten the tamper proof screws
with the tamper proof wrench. Store the wrench in a secure place.
2. Open the inspector’s test valve and time how long it
takes for the detector to indicate a flow condition. The
detector should remain activated until the inspector’s
test valve is closed. Air pockets in the sprinkler system
may increase the apparent delay.
Under normal conditions, System Sensor waterflow detectors should provide years of trouble-free service. However,
if the delay mechanism or switch enclosure becomes
faulty, replace it. To replace the delay mechanism or
switch enclosure, use a phillips head screwdriver to remove the three screws that hold it in place. Either mechanism can be easily replaced without removing the
detector from the pipe or draining the pipe. Do not repair
or replace any other waterflow detector components. If
any other part of the detector does not perform properly,
replace the entire detector. Failure to to follow this instruction may result in failure of the detector to report the
flow of water. To replace the delay mechanism, request
Part No. A3008-00. For switch enclosure, request Part No.
A77-01-02.
Figure 6. Delay adjustment dial:
Table of dial settings
embossed here.
See below.
ON
ER
DIAL
MB
NU
2
3
Delay adjustment dial
0
APP
0
ROX
IMA
1
15
TE
1
2
30
TIME
4
45
55
DEL
0
5
AY
70
(SE
CON
DS)
5
4
3
Dial setting
Seconds (±50%)
D770-01-00 6 I56-459-07
0
0
15
1
23
30
45
55
5
4
70
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A78-1496-05
To remove a detector:
1. Drain the pipe.
2. Turn off electrical power to the detector and disconnect
the wiring.
3. Loosen the nuts and remove the U-bolts.
4. Gently lift the saddle far enough to get your fingers un-
der it. Then, roll the vane so it will fit through the hole
while continuing to lift the waterflow detector saddle.
5. Lift the detector clear of the pipe.
CAUTION
If a vane breaks in a pipe, find and remove it. If it is not removed, the vane may restrict the flow of water to all or part
of the sprinkler system.
D770-01-00 7 I56-459-07
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The Limitations of Waterflow Alarm Devices
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
Three-Year Limited Warranty
System Sensor warrants its enclosed waterflow detector to be free from defects in materials and workmanship under normal use and service for a
period of three years from date of manufacture. System Sensor makes no
other express warranty for this waterflow detector. No agent, representative, dealer, or employee of the Company has the authority to increase or
alter the obligations or limitations of this Warranty. The Company’s obligation of this Warranty shall be limited to the repair or replacement of any
part of the waterflow detector which is found to be defective in materials
or workmanship under normal use and service during the three year period commencing with the date of manufacture. After phoning System
Sensor’s toll free number 800-SENSOR2 (736-7672) for a Return Authorization number, send defective units postage prepaid to: System Sensor,
WARNING
of 10-15 years. Hard water systems, however, may reduce waterflow detector service life to 4 or 5 years.
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.
Repair Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL
60174. Please include a note describing the malfunction and suspected
cause of failure. The Company shall not be obligated to repair or replace
units which are found to be defective because of damage, unreasonable
use, modifications, or alterations occurring after the date of manufacture.
In no case shall the Company be liable for any consequential or incidental
damages for breach of this or any other Warranty, expressed or implied
whatsoever, even if the loss or damage is caused by the Company’s negligence or fault. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may
not apply to you. This Warranty gives you specific legal rights, and you
may also have other rights which vary from state to state.
D770-01-00 8 I56-459-07
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© System Sensor 1996
INSTALLATION AND MAINTENANCE INSTRUCTIONS
WFDT/WFDTH Vane-type
Waterflow Detectors
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
A Division of Pittway
Specifications
Contact Ratings: Two sets of SPDT (Form C)
10 A @ 125/250 VAC; 2.5 A @ 24 VDC
Triggering Threshold Bandwidth (Flow Rate): 4 - 10 GPM
Service Pressure Rating: 250 PSI (Max.)
Overall Dimensions, Installed: WFDT– 45/16
WFDTH– 45/16
″
H × 3
″
H × 3
3
/4
″
9
/16
W × 6
″
W × 6
3
/4″D
3
/4″D
Operating Temperature Ranges: 32°F - 120°F (0°C - 49°C)
Shipping Weight: 2.6 lbs.
The WFDT is U.L. listed for indoor and outdoor installations
The WFDTH is U.L. listed for indoor use only. The WFDTH can be installed between 2×4 stud wall construction.
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.
Tee Depth Threaded Sweat Poly B CPVC
1 × 1 × 1″
11/4 × 11/4 × 1″
11/2 × 11/2 × 1″
2 × 2 × 1"
Approximate Tee Depth Requirements
(See Figure 1)
21/8″
21/2″
23/4″
13/4″ N/A 21/4″
21/6″ N/A
21/4″
21/2″
N/A 23/4″
N/A
N/A
N/AN/A
CAUTION
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 off 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. Water flow in the pipe deflects a vane.
Deflection of the vane produces a switched output, usually
after a specified delay.
All WFDTs have a pneumatically controlled mechanical
delay mechanism. Delays are noncumulative; they reset if
the flow of water stops before the entire delay has elapsed.
All detectors will activate on a sustained flow of water
greater than 10 gallons per minute (gpm) but will not
activate if the flow rate is less than 4 gpm.
Compatible Pipe Tees
The WFDT and WFDTH fit 1″ to 11/2″ NPT threaded ferrous
and brass, 1″ to 2″ sweat brass, 11/2″ polybutylene plastic
and 1″ pvc plastic tees having a 1″ threaded NPT branch
(see Figure 1 and chart for recommended tee depths).
Figure 1. Mounting dimensions:
33/4″
(WFDT)
39/16″
(WFDTH)
3″
45/16″
Tee Adapter
Tee Depth
Refer to
Tee Depth
Table
Gage (End of Paddle Tree)
Must Fit Between Top of
Tee and Bottom of Flange
Tee Fitting
Plastic Vane
A78-1939-00
Installation Guidelines
Before installing any waterflow alarm device, be
thoroughly familiar with:
NFPA 72: National Fire Alarm Code
NFPA 13: Installation of Sprinkler Systems
NFPA 25: Inspection, Testing, and Maintenance of
Water-based Fire Protection Systems
NFPA 13D: Standard for 1 and 2 Family Dwellings and
Manufactured Homes
NFPA 13R: Standard for Multi-family Dwellings
N770-05-00 1 I56-480-03
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Figure 2. Assembly diagram:
COVER
TAMPER PROOF
WRENCH (P/N WFDW)
DELAY
MECHANISM
(REPLACEMENT
P/N A3008-00)
WATERFLOW
FLOW
FILLISTER
HEAD SCREW
1″ NPT THREAD
ACTUATOR
LEVER
SWITCH ENCLOSURE
(REPLACEMENT
P/N A77-01-02)
GROUND
SCREW
(GREEN)
MOUNTING
PLATE
PADDLE
(PADDLE
REPLACEMENT
KIT (P/N PRK9)
A78-2134-01
(Cover tamper option is available.)
Also, follow other applicable NFPA standards, local codes
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.
1. Mount the detector where there is adequate clearance
for installation and removal and a clear view of it for inspection. See Figure 1 for mounting dimensions.
2. Locate to protect from damage, 6-7 feet above the floor.
3. On horizontal runs, position the detector on top of the
pipe or on the side of it. 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 6 inches from a fitting which
changes the direction of the water flow, or no closer than
24 inches from a valve or drain.
5. BE SURE DIRECTION-OF-FLOW ARROW MATCHES ACTUAL DIRECTION OF FLOW IN THE PIPE.
Mounting Instructions
1. The WFDT and WFDTH waterflow detectors are designed to fit only the appropriate tee fitting.
2. WFDT and WFDTH units are shipped without paddles
mounted to the actuator. Select the correct size paddle
for the type of tee being used. Align hole on stem of
paddle with hole on actuator lever. Fasten together using
a #4-40 x 1/4" fillister head screw supplied in bag assembly. See Figure 2. Use only the screw provided with
the unit. Drive screw head through hole in paddle until
it seats to actuator lever surface. No washer is required.
For paddle replacement refer to Maintenance section.
3. Carefully roll the vane opposite the direction of flow and
insert through tee. Thread detector onto tee fitting and
tighten with wrench. Use of thread sealant or tape is recommended. Use height gage (located at end of paddle
tee) to ensure proper depth of detector on tee fitting. See
Figure 1. Height gage must fit between top of tee fitting
and under side of hex tee adapter. A gap between gage
and tee adapter is acceptable. When correctly installed,
the detector must face in the proper direction of
waterflow and be aligned with the pipe.
4. Remove the metal cover. Move the actuator lever back
and forth to check for binding. If the vane binds, remove
the detector and correct the problem before proceeding.
CAUTION
Be sure the direction-of-flow arrow points in the right direction, otherwise a waterflow condition will go unreported.
See Figure 2.
Preoperation Testing
1. Fill the sprinkler system with water and check for leaks
around the WFDT or WFDTH. If there is a leak, check to
see that the fittings are tight. If leak persists, drain the
system and remove the detector (see removal instructions under Maintenance). Check for damaged threads
or cracked fitting. 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) terminal switch contacts. 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.
NOTE: Leg of tee perpendicular to flow of water must
have a 1" NPT thread. Do not use a reducer to
achieve the correct thread size. Failure to follow
this instruction will result in failure of the detector
to report a waterflow condition.
N770-05-00 2 I56-480-03
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Figure 3. Field wiring:
Switch 1
COM
Top Vie w
NOTE: Common and B connections will
close when vane is deflected, i.e.,
when water is flowing. Dual switches
permit applications to be combined
on a single detector.
COM
ABBA
WFDTH
WFDT
BB
to nonsilenceable initiating
zone of listed FACP
to power source
compatible
with bell
COM COM
Typical FACP Connection
B
COM
Typical Local Bell Connection
Field Wiring
WARNING
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.
Switch 2
WFDTH
WFDT
BB
COM COM
local
bell
WFDT and WFDTH
switch assembly
CONTACT RATINGS
125/250 VA C
24 VDC
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
end-of-line resistor
A78-1992-00
After extended service, parts of the detector may become
worn reducing the delay time and causing false alarms. If
this happens, increase the delay. If the delay is already at
maximum, replace the mechanical delay assembly. Refer to
Maintenance section for ordering replacement parts.
1. The WFDT and WFDTH have two SPDT switches. Switch
contacts (COM and B) 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 units. When grounding is required, clamp wire with screw in hole located
between conduit entrance holes. See Figure 2.
Mechanical Delay Adjustment
The pneumatic delay is preset at dial setting 2 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 0-70 seconds. See Figure 4.
NOTE: Set the delay to the minimum required to prevent
false alarms due to flow surges.
N770-05-00 3 I56-480-03
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Figure 4. Delay adjustment dial:
Table of dial settings
3
2
45
1
30
0
15
0
1
0
2
3
Delay adjustment dial
Dial setting
Seconds (±50%)
001152303454555
embossed here.
See below.
4
55
5
70
5
4
70
A78-1596-05
Operational Testing
Always notify a central station monitoring waterflow
alarms before repairing, maintaining or testing waterflow
alarm devices.
1. Replace the cover and tighten the security screws with
the tamper proof wrench. Store the wrench in a secure
place.
2. Open the inspector’s test valve and time how long it
takes for the detector to indicate a flow condition. The
detector should remain activated until the inspector’s
test valve is closed. Air pockets in the sprinkler system
may increase the apparent time delay.
Maintenance
To prevent accidental water damage, control valves should
be shut tightly and the system completely drained before
waterflow detectors are removed or replaced.
Inspect detectors monthly for leaks. Test detectors at least
monthly as described under Operational Testing above to
insure proper operation. This device is not designed for use
on “dry pipe” systems. Test more often if required by the
authority having jurisdiction.
replacement kits are available. To replace the delay
mechanism, request Part No. A3008-00; for switch
enclosure, request Part No. A77-01-02. Complete
instructions are enclosed with each. Either mechanism can
be easily replaced without removing the detector from the
pipe or draining the pipe. If damage occurs to paddle, order
replacement kit PRK9. Refer to procedure below for
removal of detector on pipe. Do not repair or replace any
other waterflow detector components in the field. If any
other part of the detector does not perform properly,
replace the entire detector. Failure to follow this
instruction may result in failure of the detector to report
a waterflow condition.
Proceed as follows to remove a detector.
1. Drain the pipe.
2. Turn off electrical power to the detector, and then disconnect wiring.
3. Unscrew WFDT or WFDTH from tee fitting.
4. Lift detector clear of pipe.
CAUTION
Under normal conditions System Sensor waterflow
detectors should provide years of trouble-free service. If,
however, the delay mechanism becomes faulty,
WARNING
The Limitations of Waterflow Alarm Devices
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 NFPA Standard 25.
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.
Three-Year Limited Warranty
System Sensor warrants its enclosed waterflow detector to be free from defects in materials and workmanship under normal use and service for a
period of three years from date of manufacture. System Sensor makes no
other express warranty for this waterflow detector. No agent, representative, dealer, or employee of the Company has the authority to increase or
alter the obligations or limitations of this Warranty. The Company’s obligation of this Warranty shall be limited to the repair or replacement of any
part of the waterflow detector which is found to be defective in materials
or workmanship under normal use and service during the three year period commencing with the date of manufacture. After phoning System
Sensor’s toll free number 800-SENSOR2 (736-7672) for a Return Authorization number, send defective units postage prepaid to: System Sensor,
If a vane breaks off in a pipe, find and remove it. Failure to
do so may restrict the proper flow of water to part of the
sprinkler system.
3. Vane-type waterflow detectors have a normal service life
of 10-15 years. Hard water systems, however, may reduce waterflow detector service life to 4 or 5 years.
4. 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.
Repair Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL
60174. Please include a note describing the malfunction and suspected
cause of failure. The Company shall not be obligated to repair or replace
units which are found to be defective because of damage, unreasonable
use, modifications, or alterations occurring after the date of manufacture.
In no case shall the Company be liable for any consequential or incidental
damages for breach of this or any other Warranty, expressed or implied
whatsoever, even if the loss or damage is caused by the Company’s negligence or fault. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may
not apply to you. This Warranty gives you specific legal rights, and you
may also have other rights which vary from state to state.
N770-05-00 4 I56-480-03
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© System Sensor 1996
INSTALLATION AND MAINTENANCE INSTRUCTIONS
WFDTNR Vane-type
Waterflow Detector
Specifications
Contact Ratings: 10 A @ 125/250 VAC
2.5 A @ 24 VDC
Triggering Threshold Bandwidth (Flow Rate): 4 - 10 GPM
Static Pressure Rating: 250 PSI (Max.)
Overall Dimensions, Installed: 3.25" x 4.25" cover dia.
3.25" above pipe tee
Operating Temperature Range: 32°F - 120°F (0°C - 49°C)
Shipping Weight: 1.5 lbs.
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.
CAUTION
Tee Depth Threaded Sweat Poly B CPVC
1 × 1 × 1″
11/4 × 11/4 × 1″
11/2 × 11/2 × 1″
2 × 2 × 1"
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
Approximate Tee Depth Requirements
(See Figure 1)
21/8″
21/2″
23/4″
13/4″ N/A 21/4″
21/6″ N/A
21/4″
21/2″
N/A 23/4″
N/A
N/A
N/AN/A
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 off 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 wet-pipe systems
only. Water flow in the pipe deflects a vane. Deflection of
the vane produces a switched output. All detectors will activate on a sustained flow of water greater than 10 gallons
per minute (gpm) but will not activate if the flow rate is
less than 4 gpm.
Compatible Pipe Tees
Model WFDTNR fits 1"–11/2" NPT threaded ferrous and
brass, 1" - 2" sweat brass, 11/2" polybutylene plastic and 1"
pvc plastic tees having a 1" threaded NPT branch (see Figure 1 and chart for recommended tee depths).
Installation Guidelines
Before installing any waterflow alarm device, be thoroughly familiar with:
NFPA 72: Installation, Maintenance and Use of Local
Protective Signalling Systems
Figure 1. Mounting dimensions:
3 1/4"
1 3/4"
3 1/4"
"TEE DEPTH"
REFER TO
TEE DEPTH
TABLE
PIPE TEE FITTING
PLASTIC VANE
HEX TEE ADAPTOR
INSTALLATION GAGE
(END OF PADDLE TREE)
MUST FIT BETWEEN TOP
OF TEE AND BOTTOM OF
HEX TEE ADAPTOR FLANGE.
A78-2110-00
NFPA 13: Installation of Sprinkler Systems, specifically
Section 3.17
NFPA 25: Inspection, Testing and Maintenance of Sprin-
kler Systems, specifically Chapters 4 and 5
NFPA 13D: Standard for Residential Dwellings
NFPA 13R: Standard for Multifamily Dwellings
Other applicable NFPA standards, local codes 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
N770-06-00 1 I56-509-01
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