System Sensor A3008-00 and A77-01-02 - Manual

N770-07-00 1 I56-0516-002
Replacement Timer Delay Assembly
A3008-00 and Switch Assembly
A77-01-02 for WFD and WFDT
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
NOTICE: This manual should be left with the owner/user
of this equipment.
General Information
This manual includes instructions for replacing either of
the assemblies listed above. Either of these may be replaced
without replacing the other.
The waterflow device need not be removed from the sprin-
kler system while the timing delay and/or switch assembly
is being replaced. Do not tamper with the main plate attach-
ment screws since water leakage will occur. (See Figure 1.)
Do not replace any other component of the waterflow indi-
cator in the field. If any other functional part of the detector
becomes faulty, remove and replace the entire detector. Not
doing so may result in the failure of the detector to indicate
a waterflow condition.
Delay Mechanism Removal
1. Turn the dial to zero (0) and remove the three screws
holding the delay mechanism in place.
2. Gently lift the front of the delay mechanism approxi-
mately 30 degrees to clear the paddle lever arm (see
Figure 1).
3. Pull forward and rock the delay mechanism back and
forth slightly to disengage the switch buttons from the
timer stop.
Figure 1. Delay Assembly (WFDT shown, WFDXX lower unit configuration is different):
Delay Mechanism Replacement
1. Turn the replacement delay mechanism to zero (0).
2. Orient the timer stop as depicted in Figure 2. Note the off-
set in the two vertical faces of the stop and their position.
3. Placing the mechanism on a slight angle to the water-
flow device as shown in Figure 1, slide the rear of the
timer shaft between the switch buttons until the timer
stop is encountered. Rock the delay mechanism back
and forth to retract the switch buttons and continue to
seat the delay mechanism into position on the plate.
4. Check the following before replacing the retaining
screws (refer to Figures 1 and 2).
a. Insert the end of the shaft into the rear slot of the
switch enclosure (see Figure 1).
b. Rest the paddle lever arm on the front face of the
timer stop (see Figure 2).
c. Center the delay mechanism on the plate, making
sure the slots in the plastic are aligned with the holes
in the metal mounting plate.
d. Make sure the leading edge of the mounting plate
boss is in contact with the stops on the delay mecha-
nism (see Figure 1).
e. Firmly seat the delay mechanism on the three sup-
port posts.
f. Seat the spring hook in the groove in the paddle le-
ver arm.
W0204-00
PART NO.
A3008-00
TILT 30 ∞ TO
REMOVE AND
RE-INSTALL
DELAY
MECHANISM.
TIMER STOP
CUTAWAY
VIEW
RAISED
BOSS
PART NO.
A77-01-02
STOP
SWITCH
ENCLOSURE
VERTICAL
ALIGNMENT
WALL
(BEHIND STOP)
SWITCH ENCLOSURE SLOT
SPRING
PADDLE LEVER ARM
DO NOT REMOVE!
MAIN PLATE
ATTACHMENT
SCREWS
WFDT - 3
WFDXX - 4
ACTUATOR
ASSEMBLY
DELAY
MECHANISM
MOUNTING
PLATE BOSS
DELAY
MECHANISM
STOP
VERTICAL
ALIGNMENT
WALL
SPRING
HOOK
I56-0
516-00
2