System Sensor WFDT and WFDTH - Manual (Page 2)

N770-05-00 2 I56-0480-013R
Failure to follow these directions may result in failure of the device to report
a waterflow condition. 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.
2. Locate to protect from damage, 6-7 feet above the floor.
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 condensation may collect in
the housing and impair the operation of the detector.
For vertical flow applications, mount detector on pipe where upflow con-
ditions exist. Failure to do so may prevent unit from operating properly.
4. Mount detector at least 6 inches from a fitting which changes the direc-
tion of the water flow, or no closer than 24 inches from a valve or drain.
5. BE SURE DIRECTION-OF-FLOW ARROW MATCHES ACTUAL DIREC-
TION OF FLOW IN THE PIPE.
figUre 2. assembLY Diagram:
TAMPER
PROOF
WRENCH
(P/N WFDW)
COVER
DELAY
MECHANISM
(P/N A3008-00)
GASKET
(WFDT ONLY)
WATERFLOW
FLOW
TERMINAL BLOCK
(REPLACEMENT P/N
A77-01-02)
GROUND SCREW
(GREEN)
MOUNTING
PLATE
PADDLE
(P/N PRK9)
FILLISTER
HEAD SCREW
1˝ NPT
THREAD
ACTUATOR
LEVER
COVER TAMPER
SWITCH
(P/N 546-7000)
W0127-00
moUnTing insTrUcTions
1. The WFDT and WFDTH waterflow detectors are designed to fit only the
appropriate tee fitting.
NOTE: Leg of tee perpendicular to flow of water must have a 1-inch 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. WFDT and WFDTH 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 actuator lever. Fasten together
using a #4-40×
1 ⁄
4
-inch 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 height gage (located at end
of paddle tree) to ensure proper depth of detector on tee fitting. See Fig-
ure 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
correctly installed, the detector must face in the proper direction of wa-
terflow 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 detector and correct the prob-
lem before proceeding.
CAUTION
Be sure the direction-of-flow arrow points in the right direction, otherwise a
waterflow condition will go unreported. See Figure 2.
preoperaTion TesTing
1. Fill the sprinkler system with water and check for leaks around the
WFDT or WFDTH. If there is a leak, check to see that the fittings are
tight. If leak persists, drain the system and remove the detector (see re-
moval 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.
2. Connect an ohmmeter or continuity tester across (COM and B-NO) ter-
minal switch contacts. The ohmmeter should show an open circuit, no
continuity.
3. Deflect the actuator lever and hold it until the pneumatic delay shaft
releases the switch buttons. The ohmmeter or continuity tester should
show a short circuit after the delay has elapsed. If there is no delay,
check the setting of the delay adjustment dial.
fieLD Wiring
WARNING
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
means to provide all–pole 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-NO) are closed when water is flowing and open when water is not
flowing. Connect the switches as shown in Figure 3 depending on the
application.
2. When connected to a listed sprinkler/fire alarm control panel, the initiat-
ing circuit must be non-silenceable.
3. A ground screw is provided with all units. When grounding is required,
clamp wire with screw in hole located between conduit entrance holes.
See Figure 2.