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.
Transformer (Optional)
A transformer is available to be mounted under the cover.
Holes are provided on the top plate for a standard 24 VAC to 12
VAC transformer. This type of transformer is used when the
plug-in AC adapter is not acceptable.
Mounting Holes
To install transformer:
1. Disconnect power to unit.
2. Remove cover.
3. Use self-tapping screws to secure transformer to top plate.
4. Clip wires with plastic tie-wrap to ensure that the wires do
not tangle in camshaft.
Top Plate
The top plate holds the valve discs in place during operation. This
plate is removed to allow cleaning and replacing the valve discs.
NOTE:
The Pentair Water valve discs are made from a
chloramine resistant severe service rubber. The valve
discs will usually not need to be changed. Before
removing the top plate for valve disc service be
certain that one of the discs is not operating correctly.
To remove top plate:
Remove screws
1. Disconnect power to unit.
2. Remove cover.
3. Remove motor.
4. Remove camshaft.
5. Place unit in bypass.
6. Release water pressure by pushing the last valve disc open
with a screwdriver.
7. Any optional items may be removed.
8. Wiring harnesses should be removed.
9. Remove valve disc and spring.
10. Use a phillips screwdriver to remove the screws from the
top plate.
11. Lift the top plate off. All the valve discs can be pulled
straight out.
Inspect valve discs for wear. The sealing surface is the raised
ridge on the underside of the top shoulder.
Check each valve disc cavity in the valve for debris. Remove
any foreign objects before replacing the valve disc.
To install valve discs:
NOTE:
If the valve disc fits properly in the cavity, it will
work correctly.
1. Put the valve disc into the correct (based on shoulder size)
valve port cavity. The metal end without rubber coating
should be visible.
2. Push down on the shoulder to position the valve disc
completely into the port cavity.
3. The metal portion will be positioned straight up and the top
of the shoulder will be level with the valve.
To install the top plate:
1
5
9
13
17 15
11
7
3
4
8
12 16
18 14
10
6
2
NOTE:
All valve discs should be in position. Use the same
screws that were removed to reassemble the top plate.
WARNING:
Follow the procedure to engage the screws
with the existing threads. If the same threads
are not used, the holding power of the screw
is lost. Under pressure the valve can leak.
Screws that have the same diameter but have
different threads should not be used.
1. Position the top plate on top of the valve and over the
valve discs.
2. Insert a screw at one of the corner positions.
WARNING:
This procedure for reinserting screws must be
followed to ensure proper holding strength of
the screws.
A. Drop screw of same size and thread into the hole.
B. Use a phillips screwdriver and lightly rotate the screw
backwards (counterclockwise).
SERVICE AND MAINTENANCE
CONTINUED
28
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AUTOTROL
742/762 Control 255 & Performa Series Valves (263, 268, 268FA) Service Manual