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:
300
µ
A at 12 and 24 V (DC–FWR) or
400
µ
A 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 two-
wire initiating zone of a fire alarm control panel. When determining com-
patibility 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 indi-
cators 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 instal-
lation and operation of waterflow detectors. Purchasers who install water-
flow 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 instruc-
tions 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 sys-
tems. Waterflow in the pipe deflects a vane, which produces a switched
output–usually after a specified delay. All waterflow detectors have a con-
trolled delay mechanism. Delays do NOT accumulate; they reset if the
flow of water stops before the entire delay has elapsed. All switches actu-
ate when the water flow rate is 3 gallons per minute or greater. This
System Sensor installation manual covers the following waterflow detec-
tors 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
2
1
⁄
2
″
(73.0mm)
4.8mm to 5.2mm
LFD25-76MM
2
1
⁄
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 lubri-
cant.
CAUTION
firealarmresources.com
