Installation and Service Manual – Metered Carbon Filter
Page 26
Copyright © 2012 Applied Membranes, Inc. All Rights Reserved.
Drive Cap Assembly
Disassembly:
Turn off supply water and relieve system pressure. The drive assembly must be removed to access the
drive cap assembly. The drive cap assembly must be removed to 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 (V3193-02 Figure 1) or insert a ¼” to ½” flat bladed 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 the top 2” of the piston cavity. See
Figure 2. The notches are visible through the holes. Lever the screwdriver so the drive cap assembly turns counter
clockwise. Once loosened unscrew the drive cap assembly by hand and pull straight out.
Inspection:
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. Visually inspect the drive cap for damage and free operation of the
gear and threaded rod. The only replaceable part on the drive cap assembly is the o-ring.
Main Piston
Disassembly and Inspection:
Attached to the drive cap assembly is the main downflow piston. To remove, fully extend
the piston rod and then unsnap the main piston from its latch by pressing on the side with the number. Chemically clean
the piston in dilute sodium bisulfite or vinegar, or replace it. The main piston is Teflon coated. If the teflon coating is
abraded, replace the main piston.
Reassembly:
Reattach the main piston to the drive cap assembly. 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 until the
backside of the drive cap bottoms out and is flush with the casting or 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 of the piston 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 (4 pin, black cable) and plug back in. This
resets the electronics and establishes the service piston position. The display should flash all wording, then flash the
software version and then reset the valve to the service position.
