System Sensor WFD Installation And Maintenance Instructions page 2

h e -boli, tightening the
nuts
alernately
to
ensure
a
unilform
seal
PRE-OPERATION TESTING
(see Table 1 for torque values)
6.
Remove
the metal
cover
with the
tamper-proof
wrench
provlded.
ove
Ihe
actuator lever back
and forth
to
check
for binding.
I the
vane
binds, re*
move
the detector
and
correct
the
cause
before
proceeding
. Fill the sprinkler system and check lor 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 (reler to Mainte
nance). 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.
ACAUTION
Be sure the direction-of-low arow points in the right direction or else water 2. Connect an ohmmeter or econtinuity tester actos the COM and B-NO
low will
go
unreported.
See
Figure
3
switch terminals. The ohnmeter should indicate an open clrcuít.
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.
FIaURE 1.
MOUNTING
DIMENSIONS
_95mm
(3/T)
FiGURE 3. AsSEMBLY DIAGRAM:
-COVER
TAMPER PROOF
WRENCH
(P/N WFDW)
76mm
(3)
PIPE DIAMETER
PLUS 133mm
(5)
U-BOLT
NUT
TERMINAL
BLOCK
(REPLACEMENT
P/N A77-01-02)
h,|
PIPE
SADDLE
DELAY
MECHANISM
(REPLACEMENT
(P/N A3008-00)
ELECTRICAL
CONDUIT
ENTRANCE
PIPE
MOUNTING PLATE
PIPE
VANE
U-BOLT
NUT
PIPE SADDLE
U-BOLT
PLASTIC VANE
ROLL PADDLE
OPPOSITE OF
FLOW ARROW
WHILE INSERTING
OVERALL IDTH = PIPE DIAMETER+76mm (3)
FIGURE 2. MOUNTING HOLE LOCATION:
SADDLE GASKET
WRONG
PIPE
RIGHT
WATERFLOw
REFER To
TABLE 1
U-BOLT
WIRING
REMOVE BURRS FROM EDGE OF HOLE. CLEAN OUT SCALE
AND
FOREIGN
MATTER FROM INSIDE
WALL OF PIPE.
1. All models have two SPDT switches. Switch contacts COM and B-NO
are closed when water is lowing and open when it is not. Connect the
switches, as shown in Figure 4, depending on the application.
When connected to a listed sprinkler/fire alarm control panel, the initat-
ing circuit must be nonsilenceable.
TABLE 1:
WFD MODEL
HOLE SIZE (IN) TORQUE
A
ground
screw
is provided
with all waterflow detectors. When
ground
ing ls required, clamp wire with serew in hole located between condult
entrance holes. See Figure SA, page 4.
f a second conduit enuy is required, remove the knockout plug using à
1lat blade screwdriver as shown on Figure 5B, page 4. Strike sharply ith a
hamner 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 watertlow
detector
is
supported alequately
during this
operatlon
to
avoid
injury
20, 25
14
30-35 It-b.
30-2, 35, 40, 50, 60, 80|
2
55-60 fl-lb.
D770-01-0OC
156-0459-017C