IONPURE
®
VNX CEDI Modules
Page 19 IP-MAN-VNX-1019-EN.pdf
· Ensure that polarity of DC connections is correct before applying
DC power. Operation with polarity reversed will permanently
damage the cathode. It is critical that the red and black wires are
correctly oriented on the positive (+) and negative (-) terminal
blocks.
· Junction box terminal strips screws should be tightened to 1.6 N-
m (14 lb
f
-in) to avoid wire loosening, arcing and overheating.
· The ground in the junction box must be connected to earth ground.
· All wiring done in the field must conform to local electrical codes. Consult your Local
Service Provider if there is a conflict between the instructions in this manual and the
local codes.
· Power connections for the modules must be connected to a suitable DC power supply
capable of meeting the DC power requirements of the module (see Table 2-2).
3.4. RO/CEDI System Design Considerations
· Direct feed of an RO system to the CEDI system requires use of a pressure relief valve
or rupture disk between the RO and CEDI to prevent accidental overpressure of the
CEDI.
· If the CEDI system is fed from a tank instead of directly from an RO system, there are
two requirements:
o The CEDI feed pump must be sized so that its dead-head pressure does not
exceed the 100 psig (6.9 bar) pressure limit of the CEDI modules.
o There must be prefiltration directly upstream of the CEDI system (5 micron
suggested) as experience has shown tanks and repumping to be a common
source of particulate contamination.
· The CEDI DC power supply must be interlocked with the RO feed pump or the CEDI
feed pump (whichever is appropriate) to ensure that the power supply can’t be
energized if the pump is not running.
· In addition, the EDI system must have low flow protection for both the product and
reject.
· Piping to the CEDI modules should be designed to minimize mechanical stress on the
CEDI piping connectors.
· Start/stop systems should have provisions to automatically divert RO permeate to
drain upon startup from standby condition. This is necessary because the initial RO
permeate is usually worse quality than the RO feed water! It is better to flush for a set
time period (3-5 minutes) rather than to a conductivity endpoint.
· Systems that reclaim CEDI reject and send it back to the RO inlet should have
provisions for venting the electrode gases.
· Automatic valves downstream of the CEDI should be designed to close slowly (>3
seconds) and must avoid momentary dead-heading of the CEDI module.
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