IONPURE
®
VNX CEDI Modules
Page 27 IP-MAN-VNX-1019-EN.pdf
· Verify that all piping connections are secure.
· Close cleaning pump discharge valve until ready to pump the cleaning solution into
the VNX system.
6.6.2 Cleaning
· Follow the instructions in Section 6.6.1 (above) to prepare the VNX system for
chemical cleaning.
· Make sure the tank drain valve is closed.
· Fill the tank with the required amount of water, according to the applicable solution
recipe in Section 6.7.
· Circulate water through the CEDI system, check CIP apparatus for leaks, fix any leaks
if present.
· Mix the required amount of chemical (from the applicable recipe in Section 6.7) with
the water in the tank. In the case of HCl, additional acid may be required during the
recirculation period.
· Open the pump suction and pump bypass valves.
· Start the cleaning pump and circulate the solution through the pump bypass to mix the
contents of the tank.
· When the solution is well mixed, gradually open the pump discharge valve while
closing the pump bypass valve to adjust the product and reject flow rates to the values
given in Section 6.4, Table 6-1.
· Recirculate the solution through the module for 30-60 minutes. Longer contact time
may be desirable in some instances. See Ionpure Service Bulletin 2007-02b. Contact
Ionpure Technical Support if you have further questions.
6.6.3 Return to service
· Turn off the cleaning pump.
· Check pH of solution in tank. Neutralize if necessary, then drain the CIP system tank.
· Refill the tank with water.
· Optional step: make brine solution, circulate through CEDI and then drain tank. This
helps remove chemicals from CEDI and may speed rinse up to quality.
· Refill tank with water, circulate through CEDI and then drain tank.
· Close the cleaning pump discharge valve. Keep product and reject lines directed to
drain and disconnect the CIP equipment from the CEDI system.
· Turn on the feed water supply to the CEDI system. Gradually allow RO product water
to flow through the module to drain.
· Flush residual cleaning solution from the CEDI system for five minutes, then apply the
DC power.
· Flush water to drain with DC power on until reaching desired CEDI product water
quality, then send product water to use.
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