System Sensor WFDT Installation And Maintenance Instructions page 3

Figure 3. Field wiring:
T o nonsilenceable
initiating zone of
listed FACP
To power source
compatible
Field 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 severe injury or death.
When utilizing switches at voltages greater than
74VDC or 49VAC
disconnection must be incorporated in the fixed wiring,
such as a circuit breaker.
1. The WFDT and WFDTH have two SPDT switches. Switch
contacts (COM and B) are closed when water is flowing
and open when water is not flowing. Connect the switch-
es as shown in Figure 3 depending on the application.
2. When connected to a listed sprinkler/fire alarm control
panel, the initiating circuit must be non-silenceable.
3. A ground screw is provided with all units. When ground-
ing is required, clamp wire with screw in hole located
between conduit entrance holes. See Figure 2.
Mechanical Delay Adjustment
The pneumatic delay is preset at 30 seconds at the factory.
To adjust the delay, turn the adjustment dial on the delay
mechanism. Turn clockwise to increase the delay, counter-
clockwise to decrease the delay. Delay can be adjusted over
a range from 0-70 seconds. See Figure 4.
N770-05-00
•CAUTION •
T16-0010-XXX
ROUTE WIRING
B
AWAY FROM
SHARP EDGES
COM
& COPONENTS
A
SWITCH SCHEMATIC
•READY • STATE
SWITCH 1 SWITCH
A B B
WFDTH
WFDT
B B
COM
Typ ical FACP Connection
B
with bell
Typ ical Local Bell Connection
WARNING
means to provide all–pole
NOTE: Common and B connections will
close when vane is deflected, i.e.,
when water is flowing. Dual switches
permit applications to be combined
on a single detector.
2
A
WFDTH
WFDT
B B
COM COM
local
bell
COM
WFDT and WFDTH
switch assembly
NOTE: Set the delay to the minimum required to prevent
false alarms due to flow surges.
After extended service, parts of the detector may become
worn reducing the delay time and causing false alarms. If
this happens, increase the delay. If the delay is already at
maximum, replace the mechanical delay assembly. Refer to
Maintenance section for ordering replacement parts.
Figure 4. Delay adjustment dial:
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W0112-01
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3
CONTACT RATINGS
125/250 VAC 10 AMPS
24 VDC 2.5 AMPS
end-of-line resistor
COM
Break wire as shown for
supervision of connection.
DO NOT allow stripped wire
leads to extend beyond
switch housing. DO NOT
loop wires.
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W0129-00
I56-0480-012R