Specifications
Contact Ratings: 0.6 A @ 125VAC; 2 A @ 30VDC
Triggering Threshold Bandwidth
(Flow Rate): 3 gpm maximum
Static Pressure Rating: 450 PSI (Max)
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: See Low Flow models listed below
Shipping Weight: 4 to 7 lb., according to size.
Enclosure Rating: NEMA Type 4
Voltage Range: 8.4–35 V (DC–FWR); 108–132 VAC
Power Requirements: 300µA at 12 and 24 V (DC–FWR) or
400µA at 120 VAC
U. S. Patent Number: 3,845,259; 6,084,521; 6,275,160
Panel Compatibility:
The LFD waterflow indicators may receive power and operate on a twowire initiating zone of a fire alarm control panel. When determining compatibility of these devices, the standby operating voltage of the control
panel must be between 8.5 and 35 volts. In the standby mode, the LFD
draws a maximum current of 0.3mA. In alarm, the LFD acts as a short
across the initiating zone (similar to a manual fire box). For two wire
conventional fire alarm control panels, not more than 5 waterflow
indicators may be connected to a single initiating zone. The maximum
retard/reset time of the waterflow indicator plus the initiating zone shall
not exceed 90 seconds.
For two wire addressable control panels, the number of waterflow indicators connected to the panel’s signaling line circuit shall be limited
only by the circuit’s current capacity.
D770-30-00 1 I56-1620-002R
LFD Accuflow™Low Flow
Vane-type Waterflow Detector
with Solid State Time Retard
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 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
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.
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 controlled 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 3 gallons per minute or greater. This
System Sensor installation manual covers the following waterflow detectors for sprinkler/fire alarm applications.
Low Flow Models Nominal Pipe O.D. Nominal Wall Thickness
LFD20 2″ (60.3mm) 3.9mm to 4.5mm
LFD25-73MM 21⁄2″ (73.0mm) 4.8mm to 5.2mm
LFD25-76MM 21⁄2″ (76.0mm) 4.3mm to 4.7mm
LFD30-2 3″ (88.9mm) 5.0mm to 5.6mm
LFD40 4″ (114.3mm) 5.4mm to 6.4mm
The LFD models are approved for use on stainless steel and brass pipe
only.
Do NOT use any of the LFD models on any other pipe materials.
Do NOT install steel or iron pipe sections in copper piping for mounting a
waterflow detector. Incompatibility between the dissimilar metals causes
bimetallic corrosion.
CAUTION
CAUTION
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 Sprinkler Systems
NFPA 750: Water Mist Fire Protection Systems
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 associated 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 detector 6 to 7 ft. above the floor to protect from potential 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 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.
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.
CAUTION
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. 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 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.
Pre-operation
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). 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.
Be sure the direction-of-flow arrow points in the right direction or else
water flow will go unreported. See Figure 9.
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 wires and two sets of terminals.
Relay Wires (W1 & W2 designated on PCB): These wires are connected to a latching normally open (as in No Flow) relay contact. They
are isolated from all electronics. They will close and cause a short when
water flows and the retard time elapses. They will remain shorted until
waterflow stops. Once waterflow stops, these contacts will re-open.
Power Terminals (T2 designated on PCB): This is a two screw terminal block. The Accuflow gets its power from these terminals. These terminals must have voltage present from the FACP or other suitable
source of power before anything will work. If no power is present, the
Accuflow will not provide proper alarm signals. These terminals will
accept power in any polarity as well as AC-line power.
Aux Relay Terminals (T1 designated on PCB): This is a THREE screw
terminal block. These terminals are connected to a latching Form C
relay. In no flow conditions, COM is connected to A. When flow is
detected COM will disconnect from A and connect to B. This relay will
latch in that state and reset after water stops flowing.
2. Adjust Dip Switch to desired time delay. See Figure 11. For Dip Switch
location, see Figure 9.
3. When connected to a listed sprinkler/fire alarm control panel, the initiating circuit must be nonsilenceable.
4. 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 10A, page 4.
5. If a second conduit entry is required, remove the knockout plug using
a flat blade screwdriver as shown on Figure 10B, page 4. 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.
NOTE: Power terminals must be connected to FACP or other non-
silenceable initiating circuit.
Operation 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.
WARNING
CAUTION
A78-1609-00
Figure 1. Mounting dimensions:
3″
3-3/4″
Pipe saddle
U-bolt nut
Plastic vane
Pipe
U-bolt
Overall width = pipe diameter + 3″
Pipe diameter
plus 5-1/4″
Figure 2. Mounting hole location:
D770-30-00 2 I56-1620-002R
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.
Under normal conditions, System Sensor waterflow detectors should provide years of trouble-free service.
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.
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 under 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.
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.
CAUTION
Table 1:
LFD MODEL Hole Size
20, 25-73MM, 25-76MM 1-1/4
"
30-2, 40 2
"
Table 2:
LFD MODEL Torque
20, 25-73MM, 25-76MM 30 - 35 ft-lb
30-2, 40 55 - 60 ft-lb
A78-1496-07
Wrong
Right
Remove burrs from edge of hole. Clean out scale and foreign
matter for one pipe diameter on each side of hole.
Break wire as shown for
supervision of connection.
DO NOT allow stripped wire
leads to extend beyond
switch housing. Do NOT
loop wires.
D770-30-00 3 I56-1620-002R
Figure 3. Wiring LFD to bell:
BELLBELL
POWER SOURCE
A
B
C
O
M
POWER
TERMINALS
AUX RELAY
TERMINALS
Figure 7. Wiring the LFD to a panel and other device:
Leave the Relay Wires installed under the Power Terminals and connect
the panel initiating loop wires as shown below. The LFD requires power
to operate, therefore connect the FACP initiating loop wires to the Power
Terminals and Relay Wires as shown. If power should be interrupted
before the panel, the batteries in the panel will maintain power to the
LFD.
EOL
OR NEXT
DEVICE
FACP
POWER SOURCE
BELLBELL
A B COM
POWER
TERMINALS
AUX RELAY
TERMINALS
RELAY
WIRES
Figure 6. Wiring the LFD to a panel:
Leave the Relay wires installed under the Power Terminals and connect
the panel initiating loop wires as shown below.
OR NEXT
DEVICE
POWER
TERMINALS
AUX RELAY
TERMINALS
A B
C
O
M
EOL
FACP
RELAY
WIRES
TO NEXT MODULE
OR EOL
INTELLIGENT
MODULE
FACP
A B COM
POWER
TERMINALS
AUX RELAY
TERMINALS
RELAY
WIRES
Figure 8. (2 Wire Addressable) Wiring the LFD to an addressable
panel using the SLC loop wires for power:
Remove the Relay Wires from under the Power Terminals. Connect these
wires to the Addressable Module.
NOTE: Consult FACP Manufacturers’ Compatibility Guide prior to
installation.
Figure 4. (4 Wire Addressable) Wiring the LFD to an addressable
panel using an auxiliary power supply for power:
Remove the Relay Wires from under the Power Terminals. Connect these
wires to the Addressable Module.
Figure 5. Wiring the LFD using 4 wires. (Aux. Power from Panel):
Remove the Relay Wires from the Power Terminals. Cut off the spade lugs
from the ends of the Relay Wires. Put wire nuts over ends of Relay Wires
as shown. Use Aux. Relay Terminals to make connection to panel and next
device as shown.
AUX. POWER
OUTPUT
INITIATING
LOOP
A B COM
POWER
TERMINALS
AUX RELAY
TERMINALS
RELAY
WIRES
FACP
EOL POWER
SUPERVISION
RELAY (SHOWN
ENERGIZED)
A77-716 12/24V
EOL
NOTE: To comply with NFPA code, never put more than two wires in
a wire nut.
Relay wires and power terminal wiring must be contained within either a
common enclosure or enclosures within 20 feet of each other with wiring
inside conduit.
CAUTION
AUX.
POWER
OUTPUT
MODULE
SLC
LOOP
A B COM
POWER
TERMINALS
AUX RELAY
TERMINALS
RELAY
WIRES
FACP
MODULE
A B COM
POWER
TERMINALS
AUX RELAY
TERMINALS
RELAY
WIRES
NOTE: PLACE MODULE EOL
RESISTOR ACROSS RELAY
WIRES INSIDE AFD COVER.
NOTE: PLACE MODULE EOL
RESISTOR ACROSS RELAY
WIRES INSIDE AFD COVER.
AFD
ENCLOSURE
AFD
ENCLOSURE
EOL POWER
SUPERVISION
RELAY (SHOWN
ENERGIZED)
A77-716 12/24V
D770-30-00 4 I56-1620-002R
©
2001 System Sensor
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, 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.
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 of NFPA Standard 13
and NFPA 750.
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 of 10-15
years. Hard water systems, however, may substantially reduce water-
The Limitations of Waterflow Alarm Devices
WARNING
flow detector service life.
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.
Figure 11. Solid State Retard Timing Char t:
Figure 10A. Ground screw location:
Figure 10B. Knockout plug removal:
CAUTION: Only use the above timer settings.
Timing must not exceed 90 seconds.
GROUND
SCREW
(GREEN)
MOUNTING
PLATE
Switch 1 Switch 2 Switch 3
Time (sec) (60 sec) (30 sec) (15 sec)
0OFFOFFOFF
15 OFF OFF ON
30 OFF ON OFF
45 OFF ON ON
60 ON OFF OFF
75 ON OFF ON
90 ON ON OFF
ON 1 2 3
A78-1914-05
A78-1914-04
Figure 9. Assembly diagram:
Please refer to insert for the Limitations of Fire Alarm Systems
Loading...