System Sensor AFDT and AFDTH - Manual (Page 2)

Also, follow 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 inspection.
See Figure 1 for mounting dimensions.
Figure 2. Assembly diagram:
height gage (located at end of paddle tree) 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 cor-
rectly 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 detec-
tor and correct the problem before proceeding.
Be sure the direction-of-flow arrow points in the right direction,
otherwise a waterflow condition will go unreported. See Figure 2.
Preoperation
Fill the sprinkler system with water and check for leaks around
the AFDT or AFDTH. If there is a leak, check to see that the fit-
tings 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.
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 elaps-
es. They will remain shorted until waterflow stops. Once water-
flow 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 con-
nected 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.
See Figures 3 - 8 for specific wiring instructions.
2. Adjust Dip Switch to desired time delay. See Figure 11. For Dip
Switch location, see Figure 2.
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 9, page 4.
5. If a second conduit entry is required, remove the knockout
plug using a flat blade screwdriver as shown on Figure 10,
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.
WARNING
D770-34-00 2 I56-1621-004R
COVER
TAMPER PROOF
WRENCH (P/N WFDW)
DIP SWITCH
GASKET
(AFDT ONLY)
GROUND
SCREW
(GREEN)
MOUNTING
PLATE
FLOW
WATERFLOW
FILLISTER
HEAD SCREW
1 ″ NPT THREAD
ACTUATOR
LEVER
PADDLE
(PADDLE
REPLACEMENT
KIT P/N PRK9)
A78-2134-05
2. Locate the detector 6 to 7 feet above the floor to protect from
potential damage.
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 con-
densation 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 AFDT and AFDTH waterflow detectors are designed to fit
only the appropriate tee fitting.
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.
2. AFDT and AFDTH 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 actua-
tor 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