Wiring Harnesses
The wiring harnesses are designed to fit one way. The
connectors are unique to the port they plug into. The wires are
held in place by clips and the connectors latch in place.
Do not run wires through holes in topplate.
Turbine
Figure 18 - Wire Harness Routing
To remove a wiring harnesses:
Latch
Wire Clips
Slots for Motor and
Turbine Harness
1. Disconnect power to the unit.
2. Remove cover.
3. Remove controller.
4. Remove connections by squeezing the latch on the
connector and pulling out.
5. Pull the harness out of the clips on the top plate.
To install a wiring harness:
NOTE:
Start at the back of the valve and work toward the
controller. This will place any slack behind the
controller. Slack or loose wires can become tangled
in the camshaft.
Slots for motor and
transformer wires
Slots for turbine wire
1. Depending on which harness is being installed, plug the
connector into the motor or turbine.
2. Route the harness through the opening at the back of the
top plate.
3. Place the harness into the clips on the top plate. Do not
leave any slack. Put the motor wire in first, then the turbine
sensor cable second.
4. Feed the wire through the opening on the front of the top plate.
5. If installing the motor harness the connector to the optical
sensor can be clipped in place.
6. Connect the harness to the back of the controller.
NOTE:
If using both a motor and turbine cable harness,
install the smaller motor cable first. Install the
larger turbine cable second. This will lock the motor
cable beneath the wire management clips.
Microswitch (Optional Under the Cover)
The microswitch is located under the cover and is screwed to
the top plate. This switch is turned on/off by a cam lobe on the
camshaft. Its function is to signal that the unit is in-service or
out-of-service (regenerating).
Microswitches are available as kits from Pentair Water or a
standard microswitch can be used as well.
WARNING:
This switch will normally control an event on
another piece of equipment. Be certain of what
effect your actions will have on the
other equipment.
Mounting Holes
To install microswitch:
1. Connect wires.
2. Use self-tapping screws to secure the switch base to the
blind boss top plate.
3. Adjust microswitch distance to cam.
NOTE:
Proper procedure for replacing a self-tapping screw:
A. Drop screw into hole.
B. With a screwdriver, back the screw up
(counterclockwise) until the threads click.
C. Rotate the screw forward (clockwise) until finger tight.
WARNING:
The Pentair Water valve is rated for low
voltage (less than 48 volts) microswitch
components only. Using a high voltage switch
may result in damaged valves or fire and may
interfere with electronic control function.
To remove microswitch:
1. Disconnect power to the switch.
2. Remove cover.
3. Unscrew switch base from top plate.
4. Disconnect wires.
Microswitch (Optional - Front of Camshaft)
Optional Microswitch Mount
Post
Hole
Switch
Cam
This microswitch is mounted behind the controller at the front
end of the camshaft. The switch is mounted to the top plate.
The cam for this switch is screwed to the front of the camshaft.
This cam can be adjusted to activate the microswitch at any
time during the regeneration cycle.
The front end cam switch is available as a kit from Pentair Water.
WARNING:
This switch will normally control an event on
another piece of equipment. Be certain of what
effect your actions will have on the
other equipment.
SERVICE AND MAINTENANCE
CONTINUED
26
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AUTOTROL
®
740/760 Control 255 & Performa Series Valves (268, 268FA) Service Manual
