IONPURE
®
VNX50HH-2 CEDI Modules
Page 27
IP-MAN-VNX50HH2
7.
Start the cleaning pump. When chemicals are well mixed, gradually open the
cleaning pump discharge valve while closing the bypass valve to adjust the
product and reject flow rates to the values given in Section 6.5.
8.
Recirculate the solution through the module for 30 minutes. Some gas will be
produced. In addition, the module pressure drop will increase during this
procedure.
9.
Turn off the cleaning pump.
10. Check pH. Neutralize if necessary. Drain the tank.
STEP 4: Salt Flush To Drain
This salt flush rinses the cleaning solution from the module, and returns the ion exchange
resin to the sodium and chloride forms.
Chemicals needed for Step 4 (5%NaCl):
VNX50-HH
Water (RO permeate or CEDI product)
180 gal (675 liters)
Sodium chloride (NaCl)
75 lbs (34.2 kg)
1.
Remove product and reject outlet lines from the cleaning tank, and direct to
drain.
2.
Fill the tank with the water.
3.
Dissolve the sodium chloride (NaCl) in the water.
4.
Start the cleaning pump and flush to drain for about three minutes.
5.
Turn off the cleaning pump.
6.
Drain the tank.
STEP
5:
Water
Flush to Drain
This step flushes the cleaning solution out of the system, and prepares the system for
return to operation.
1.
Close the cleaning pump discharge valve. Keep product and reject lines directed
to drain and disconnect the cleaning equipment from the module.
2.
Turn on the feed water supply to the system. Slowly open the feed valve to allow
RO product water to flow through the module to drain.
3.
After flushing all residual cleaning solutions from the system, follow the initial
start-up procedures in Section 5 of this manual. Start without the DC power
applied to the VNX module for five minutes, and then apply normal operating DC
power.
6.11.
Sanitizing with Peracetic Acid
Peracetic Acid is a mixture of corrosive chemicals. Avoid contact with
these chemicals.
