Culligan International Water Softener CSM-750-2

Refer to steps 1 thru 5 under 'Pilot Valve Assembly Removal'

The pilot valve drive motor assembly is held in place with 3 panhead screws. Remove the screws and disconnect the motor leads

NOTE At this point it is also advisable to visually inspect the cam gear and microswitches for any wear indicating the need for replacement

Install the replacement pilot valve drive motor assembly making certain that the gears and assembly are properly engaged. Securely tighten the 3 screws and reconnect the motor leads

Reinstall the pilot valve body assembly in the enclosure. Make certain the pilot valve position faces left when viewed from the front of the controller. Reconnect the four quick connect wire leads to the microswitches

Connect the two motor leads to the circuit board. Reconnect all pilot valve tube connections

Warning: Ensure you are working on the correct system

Electrical power to the MVP controller disconnected

Separate source isolation valve closed

External source of pressure to the pilot valve closed

Position dial on the pilot valve rotated to position #1

Refer to steps 1 thru 3 under 'Pilot Valve Spool Removal & Replacement' on page 71.

Mark and remove all pilot valve tube connections from the pilot valve body.

Disconnect the four quick connect wire leads from the microswitches. Also disconnect the two motor leads from the circuit board. See Figure 115 and Figure 116.

Remove the 2 large panhead screws with nuts located at the bottom of the enclosure that secure the pilot valve body assembly. The pilot body assembly will now separate from the enclosure.

Refer to 'Pilot Valve Assembly Replacement' on page 73 for reinstallation instructions.

Close the manual inlet isolation valve, the manual outlet isolation valve, the manual brine valve, and any external source of pressure to the pilot valve assembly

Depressurize the system following the instructions on page 65

Disconnect the power to the MVP controller

Manually rotate the position dial on the pilot valve clockwise to position #1 to relieve pressure. Allow the flow of water to drain to stop

Remove the panhead retaining screw located at the bottom front portion of the pilot valve body. Grasp the position dial and pull the pilot valve spool assembly from the pilot valve body

Using a screw driver, gently pry the retaining clip off of the pilot valve spool

LIGHTLY lubricate all seals on the replacement pilot valve spool with Dow Corning #11 silicone grease and assemble the position dial onto the pilot valve spool assembly

Insert the new pilot valve spool assembly into the pilot valve body. Make sure that the #1 on the position dial aligns with the pilot valve body position indicator arrow

Replace the small panhead retaining screw to secure the pilot valve spool assembly into the pilot valve body. Open the manual inlet isolation valve

Warning: This service requires trained personnel with PPE!

Is the Backwash Flow Controller plugged with scale, rust, or other foreign material?

If the Backwash Flow Controller is not plugged, report the status to the maintenance team and stop the procedure

Was the cleaning of the Backwash Flow Controller successful?

Enter the backwash flow rate after cleaning

Sign off on the Backwash Flow Controllers Service