To remove microswitch:
1. Disconnect power to the switch.
2. Remove cover.
3. Remove controller.
4. Unscrew switch from top plate.
5. Disconnect wires.
To install microswitch:
1. Connect wires.
2. Screw switch base to top plate using the switch guide pin
over screw boss.
3. Attach the switch cam to front of the camshaft with a self-
tapping screw. Adjust to the appropriate cycle and tighten.
NOTE:
The cam for this switch is adjustable. To have the
microswitch activate at a different point in the cycle,
rotate the cam as needed. To rotate the cam loosen
the center screw, tighten when the cam is in the
new position.
Spring (Valve Discs)
This spring is a one-piece metal spring that applies pressure
to the valve discs holding them closed. The rotating camshaft
overcomes this pressure to open the valve discs as needed.
The shape of the spring is critical for proper operation.
WARNING:
Do not attempt to straighten or repair this
spring. If this spring is damaged, valve discs
may not operate correctly.
To remove spring:
Push open
Valve Discs
Spring locked under tabs
1. Disconnect power to the unit.
2. Remove cover.
3. Remove motor.
4. Remove camshaft.
5. Place unit in bypass.
6. Release water pressure by pushing the last valve discs
open with a screw driver.
7. Locate valve discs 3, 4 and 5.
8. Position yourself on the spring side of the valve discs.
9. Place two (or more) fingers on the flat part of the spring.
10. Move the fingers toward the valve discs and into the spring
valley between the previously located valve discs.
11. By pulling back and up on the spring, the spring will pop
out of the valley.
12. Pull back further to remove the spring.
To install spring:
SERVICE AND MAINTENANCE
CONTINUED
7
5
6
6
1. Inspect the spring for damage. Do not attempt to repair a
bent spring.
2. Position yourself on the spring side of the valve discs.
3. Position the spring over the valve body close to final
position. The wide spring segments will be located at the
wide valve discs. The curve of the spring will be down into
the valley.
4. The long flat close edge is inserted first. This edge slides
into a channel on the valve body.
5. Rock the spring back and place the flat edge into the channel.
6. Lower the springs until they rest on top of the valve discs.
7. A tool (phillips screwdriver) will be needed to push the
springs in place.
8. The spring posts will guide the spring into position.
9. Hold the flat part down with one hand.
10. Spread your fingers apart to cover the length and push down.
11. With the other hand use the tool to push down in the valley
of each spring segment.
The spring will slide off the top of the valve disc downward.
The small projection on the end of the spring will drop into the
hole in the valve disc to provide secure positioning. Repeat for
all spring segments.
NOTE:
If a spring segment goes beyond the locating hole, it can
be pulled back using a small flat blade screwdriver.
NOTE:
In high pressure (80 psi and higher) applications, the
standard single valve disc springs can be installed on
top of the one piece spring.
Terminal Block (Optional)
WARNING:
The Pentair Water valve is rated for low
voltage microswitch components only. Using
a high voltage switch may result in damaged
valves or fire and may interfere with electronic
control function.
Holes are provided to mount standard terminal blocks. The
location is under the cover on the top plate.
Mounting Holes
To install terminal blocks:
1. Disconnect power to unit.
2. Remove cover.
3. Use self-tapping screws to secure terminal block to top plate.
4. Clip wires with plastic tie-wrap to ensure that the wires do
not tangle in camshaft.
26
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AUTOTROL
®
Logix 764 Control Performa Cv Series Valves (273, 278) Service Manual
