5-2
SECTION 5: CONTROL VALVE SERVICE INSTRUCTIONS
Drive Assembly:
Remove the valve cover to access the drive assembly.
IMPORTANT NOTE:
Disconnect the power source plug (black wire) from the PC board prior to disconnecting the motor or water meter plugs from the
PC board. The power source plug connects to the four-pin jack. The motor plug connects to the two-pin jack on the left-hand side of the PC board.
The water meter plug (grey wire) connects to the three-pin jack on the far right-hand side of the PC board.
The PC board can be removed separately from the drive bracket but it is not recommended. Do not attempt to remove the display panel from the
PC board. Handle the board by the edges. To remove the PC board from the drive bracket, unplug the power, water meter and motor plugs from
the PC board. Lift the middle latch along the top of the drive bracket while pulling outward on the top of the PC board. The drive bracket has two
plastic pins that fi t into the holes on the lower edges of the PC board. Once the PC board is tilted about 45° from the drive bracket it can be lifted
off of these pins. To reinstall the PC board, position the lower edge of the PC board so that the holes in the PC board line up with the plastic pins.
Push the top of the PC board towards the valve until it snaps under the middle latch, weave the power and water meter wires into the holders and
reconnect the motor, water meter and power plugs.
The drive bracket must be removed to access the drive cap assembly and pistons or the drive cap gear cover. It is not necessary to remove the PC
board from the drive bracket to remove the drive bracket. To remove the drive bracket, start by removing the plugs for the power source and the
water meter. Unweave the wires from the side holders. Two tabs on the top of the drive back plate hold the drive bracket in place. Simultaneously
lift the two tabs and gently ease the top of the drive bracket forward. The lower edge of the drive bracket has two notches that rest on the back
plate. Lift up and outward on the drive bracket to disengage the notches.
To reassemble, seat the bottom of the drive bracket so the notches are engaged at the bottom of the drive back plate. Push the top of the drive
bracket toward the two latches. The drive bracket may have to be lifted slightly to let the threaded piston rod pass through the hole in the drive
bracket. Maintain a slight engaging force on top of the drive bracket while defl ecting the bracket slightly to the left by pressing on the side of the
upper right corner. This helps the drive gears mesh with the drive cap assembly. The drive bracket is properly seated when it snaps under the
latches on the drive back plate. If resistance is felt before latching, then notches are not fully engaged, the piston rod is not in the hole, the wires are
jammed between the drive bracket and drive back plate, or the gear is not engaging the drive cap assembly. To inspect the drive gears, the drive
gear cover needs to be removed. Before trying to remove the gear cover, the drive bracket must be removed from the drive back plate. (Refer to
the proceeding instructions regarding removing the drive bracket from the drive back plate. The drive gear cover can be removed from the drive
bracket without removing the motor or the PC board.) The drive gear cover is held in place on the drive bracket by three clips. The largest of the
three clips is always orientated to the bottom of the drive bracket. With the PC board facing up, push in and down on the large clip on the drive gear
cover. Handle the cover and the gears carefully so that the gears do not fall off of the pegs in the cover.
Replace broken or damaged drive gears. Do not lubricate any of the gears. Avoid getting any foreign matter on the refl ective coating because dirt
or oils may interfere with pulse counting.
The drive gear cover only fi ts on one way, with the large clip orientated towards the bottom. If all three clips are outside of the gear shroud on the
drive bracket and the drive gear cover slips easily into place.
The drive bracket does not need to be removed from the drive plate if the motor needs to be removed. To remove the motor, disconnect the power
and motor plugs from the jacks on the PC board. Move the spring clip loop to the right and hold. Rotate the motor at least a 1/4 turn in either direc-
tion so the wires are vertical (up & down) before gently pulling on the wire connectors to remove the motor. Pulling directly on the wires without
rotating the motor may break the wires off the motor.
Replace the motor if necessary. Do not lubricate the motor or the gears. To reinstall the motor, move the spring clip loop to the right and hold.
Gently turn the motor while inserting so that the gear on the motor meshes with the gears under the drive gear cover. Release the spring clip loop
and continue to rotate the motor until the wires are horizontal and the motor housing engages the small plastic bulge inside the drive bracket motor
retainer. Reconnect the motor plug to the two-pronged jack on the lower left hand side of the PC board. If the motor will not easily engage with the
drive gears when reinstalling, lift and slightly rotate the motor before reinserting. Reconnect the power.
Replace the valve cover. After completing any valve maintenance, press and hold NEXT and REGEN buttons for 3 seconds or unplug power source
jack (black wire) and plug back in. This resets the electronics and establishes the service piston position. The display should fl ash all wording, then
9. Time of day fl ashes on and off
A. Power has been out more than eight hours, the AC
Adapter was unplugged and then plugged back into the
wall outlet, the AC Adapter plug was unplugged and then
plugged back into the board or the NEXT and REGEN but-
tons were pressed to reset the valve
A. Reset the time of day
Summary of Contents for 3MWTS100
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