Aqua-Pure CWS150MECJ - Manual (Page 17)

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fl ash the software version (e.g. 181) and then reset the valve to the service 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” fl at blade screwdriver into one of
the slots around the top 2” of the drive cap assembly so it engages the notches molded
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 fi eld.
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 form the main piston by pressing sideways and unsnapping if
from its latch. Chemically clean in dilute sodium bisulfi te 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 bisulfi te 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 molded 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 electronics and establishes the service piston position. The display should fl ash all wording, then fl ash the software version
(e.g. 181) and then reset the valve to the service position.
Spacer Stack Assembly:
To access the spacer stack assembly remove the drive assembly, drive cap assembly and piston. The spacer stack assembly can be removed easily
without tools by using thumb and forefi nger. Inspect the black o-rings and clear lip seals for wear or damage. Replace the entire stack if necessary.
Do not disassemble.
The spacer stack assembly may be chemically cleaned (dilute sodium bisulfi te or vinegar) or wiped with a soft cloth. After chemically cleaning, rinse
the component with clean water before wiping with a clean cloth.
The spacer stack assembly can be pushed into the control valve body bore by hand. Since the spacer stack assembly can be compressed it is easier
to use a blunt object (5/8” to 1-1/8” in diameter) to push the center of the assembly into the control valve body. The assembly is properly seated with
at least four threads exposed (approximately 5/8’). Do not force the spacer stack assembly in. The control valve body bore interior can be lubricated
with silicone to allow for easy insertion of the entire stack. Do not use silicone or any other type of lubricant on the clear lip seals of the piston.
Reattach the drive cap assembly and piston(s) and the drive assembly.
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 fl ash the software version
(e.g. 181) and then reset the valve to the service position.
Injector Cap, Screen, Injector Plug and Injector:
Unscrew the injector cap and lift off. Loosen cap with special plastic wrench or pliers if necessary. Attached to the injector cap is a screen. Remove
the screen and clean if fouled. The plug and/or injector can be pried out with a small screwdriver. The plug can be wiped clean. If the plug leaks
replace the entire plug. The injector consists of a throat and a nozzle. Chemically clean the injector with vinegar or sodium bisulfi te. After chemically
cleaning, rinse the component with clean water before wiping with a clean cloth. The holes can be blown out with air. Both pieces have a small
Figure 5