16 | 3MWTS Series Water Softeners – Installation Instructions
3MWTS Series Water Softeners – Installation Instructions | 17
Drive Assembly:
Remove the valve cover to access the drive assembly.
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 deflecting 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
brackets 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 reflective coating because dirt or oils may
interfere with pulse counting.
The drive gear cover only fits 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 direction 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.
Drive Cap Assembly, Main Piston and Regenerant Piston
The drive assembly must be removed to access the drive cap
assembly. The drive cap assembly must be removed access the
piston(s). The drive cap assembly is threaded into the control
valve body and seals with an o-ring. To remove the drive cap
assembly use the special plastic wrench or insert a ¼” to ½” flat
blade screwdriver into one of the slots around the top 2” of the
drive cap assembly so it engages the notches moulded into the
drive back plate around 2” or the piston cavity. See Figure 5 on
page 5-3. The notches are visible through the holes. Lever the
screwdriver so the drive cap assembly turns to the left. Once
loosened, unscrew the drive cap assembly by hand and pull
straight out. The drive cap assembly contains the drive cap,
the main drive gear, drive cap spline, piston rod and various
other parts that should not be dissembled in the field. The
only replaceable part on the drive cap assembly is the o-ring.
Attached to the drive cap assembly is the main piston and a
regenerant piston.
The regenerant piston (the small diameter one behind the main
piston) is removed from the main piston by pressing sideways
and unsnapping if from its latch. Chemically clean in dilute
sodium bisulfite or vinegar, or replace the regenerant piston if
needed. After cleaning, rinse the component with clean water
before wiping with a clean cloth. To remove the main piston fully
extend the piston rod and then unsnap the main piston from its
latch by pressing on the side with the number. Chemically clean
in dilute sodium bisulfite or vinegar, or replace the main piston.
After cleaning, rinse the component with clean water before
wiping with a clean cloth.
Reattach the main piston to the drive cap assembly. Reattach the
regenerant piston (if needed) to the main piston. Do not lubricate
the piston rod, main piston or regenerant piston. Lubricant
will adversely affect the clear lip seals. Reinsert the drive cap
assembly and piston into the spacer stack assembly and hand
tighten the drive cap assembly. Continue to tighten the drive cap
assembly using a screwdriver as a ratchet until the black o-ring
on the spacer stack assembly is no longer visible through the
drain port. Excessive force can break the notches moulded into
the drive back plate. Make certain that the main drive gear still
turns freely.
The exact position is not important as long as the main drive gear
turns freely. Reattach the drive assembly to the control valve
and connect all plugs. 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
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.
Summary of Contents for 3MWTS Series
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