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5.3
Expansion Chamber Rupture Disc Replacement (Liquid Systems Only)
5.3.1
Ensure the expansion chamber and manifold lines in the affected area are free of chemical.
5.3.2
Without removing the expansion chamber, loosen the nuts on the four (4) studs so the halves of
the safety head can be separated approximately 1”. Lift the chamber and place a piece of wood
between the safety head top and bottom to keep them separated.
5.3.3
Remove the damaged rupture disc and make a careful inspection of the seating area of the safety
head. If the seat is dirty or tarnished, clean with a soft cloth. If it is nicked or scratched, replace the
safety head. Do not attempt to polish out deep marks.
5.3.4
Grasping the new rupture disc by the name tag, insert into the bottom half of the safety head.
The convex (dome shaped) side of the rupture disc should face the expansion chamber.
5.3.5
Lower the upper half of the safety head and tighten all nuts evenly.
5.4
PLC Reset Instructions
Sometimes a reset of the PLC is required, please follow these instructions.
5.4.1
Confirm that PLC terminal 18 LED is illuminated (indicates 24 volt supply is operational).
If no LED, check the 24V fuse.
5.4.2
Power down PLC.
5.4.3
Install a jumper between terminals 18 & 19 of the PLC. The jumper allows the controller to disregard
all inputs and resets the valve timing delay to 15 seconds.
5.4.4
Reapply power to the PLC. Allow the system to run through the initial start up and self-test.
5.4.5
Run through calibration instructions. See Section 3.1.2 in this instruction manual Be sure to allow
the 15 seconds for the valve to time out. For example: cycle “A” to open, wait 15 seconds then
cycle “A” to close, wait 15 seconds.
5.4.6
Shut off the power; remove the jumper on terminals 18 & 19.
5.4.7
Restore the power to the PLC.
5.4
PLC Fault (Blinking Red Light)
5.5.1
To reset – press ESC from MENU.
5.5.2
Arrow down to MODE SWITCH.
5.5.3 Press
OK.
5.5.4
Arrow to PROGRAM.
5.5.5 Press
OK.
5.5.6
Arrow to RUN.
5.5.7 Press
OK.
5.5.8
Fault should clear, RUN light should illuminate.
If condition persists, contact De Nora Water Technologies Service Department.