System Sensor AFDT and AFDTH User Manual
Afdt/afdth accuflow, Installation and maintenance instructions, Figure 1. mounting dimensions
Figure 1. Mounting dimensions:
A78-1939-01
3
3
/
4
(AFDT)
3
9
/
16
(AFDTH)
3
4
5
/
16
Gage (End of Paddle Tree)
Must Fit Between Top of
Tee and Bottom of Flange
Tee Fitting
Plastic Vane
Tee Adapter
Tee Depth
Refer to
Tee Depth
Table
Specifications
Contact Ratings:
0.6 A @ 125 VAC; 2 A @ 30 VDC
Triggering Threshold Bandwidth
(Flow Rate):
4–10 GPM
Static Pressure Rating:
250 PSI (Max.)
Dimensions, Installed:
AFDT–
4
5
⁄
16
″H × 3
3
⁄
4
″W × 6
3
⁄
4
″D
AFDTH–
4
5
⁄
16
″H × 3
9
⁄
16
″W × 6
3
⁄
4
″D
Operating Temperature Range: 32°F - 120°F (0°C - 49°C)
Shipping Weight:
2.6 lbs.
Enclosure Rating:
AFDT–
NEMA Type 4, as tested by
Underwriters Laboratories, Inc.
(U.L.)
AFDTH–
Indoor use only, as tested by U.L.
Voltage Range:
8.4–35 V (DC–FWR); 108–132 VAC
Power Requirements:
300 µA at 12 or 24 V (DC–FWR);
400 µA at 120 VAC
U.S. Patent Number:
3,845,259; 6,084,521; 6,275,160
D770-34-00
1
I56-1621-004R
AFDT/AFDTH Accuflow™
Vane-type Waterflow Detectors
with Solid State 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 man-
ual or a copy of it with the user. Read all instructions carefully
before beginning.
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 AFDTs have a controlled delay mechanism. Delays are noncu-
mulative; 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/Risers
The AFDT and AFDTH fit 1″ to 1
1
⁄
2
″ NPT threaded ferrous and
brass, 1″ to 2″ sweat brass, 1
1
⁄
2
″ polybutylene plastic and 1″ cpvc
plastic tees having a 1″ threaded NPT branch (see Figure 1 and
chart for recommended tee depths). For 2″ cast and malleable
threaded tees use 2″ paddle ( P02-0023-000) provided.
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 13D:
Standard for 1 and 2 Family Dwellings and
Manufactured Homes
NFPA 13R:
Standard for Residential Occupancies up to and
including Four Stories in Height
NFPA 25:
Inspection, Testing, and Maintenance of Water-
based Fire Protection Systems
Approximate Tee Depth Requirements
(See Figure 1)
Tee Depth
Threaded Sweat Poly B CPVC
1
Ч
1
Ч
1
″
1
1
/
4
Ч
1
1
/
4
Ч
1
″
1
1
/
2
Ч
1
1
/
2
Ч
1
″
2
Ч
2
Ч
1"
2
1
/
8
″
2
1
/
2
″
2
3
/
4
″
2
3
/
4
″
2
1
/
4
″
3
1
/
4
″
2
1
/
6
″
N/A
2
1
/
2
″
N/A
N/A
N/A
N/A
1
3
/
4
″
N/A
2
1
/
4
″
CPVC/Central
N/A
N/A
N/A
N/A
N/A
N/A
2
15
/
32
″
2
13
/
16
″
CPVC/Spears/
Victaulic
The AFDTH can be installed between 2X4 stud wall construction.
Panel Compatibility:
The AFD waterflow indicators may receive power and operate on
a two-wire 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 AFD draws a maximum current of 0.3 mA.
In alarm, the AFD acts as a short across the initiating zone (sim-
ilar 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 water-
flow indicators connected to the panel’s signaling line circuit
shall be limited only by the circuit’s current capacity.