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 detec-
tor. 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 con-
nected 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 termi-
nal block. The Accuflow gets its power from these terminals. These ter-
minals 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 ini-
tiating 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 repair-
ing, 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 detec-
tor 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 di 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 detec-
tors at least monthly, as described under Operational Testing, to ensure
proper operation. Test more often if required by the authority having juris-
diction.
Under normal conditions, System Sensor waterflow detectors should pro-
vide 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.
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