Operator`s manual

WRO 300 H
P/N 3027436 Rev. C
Regular Maintenance
25
Dissolve 100 ml of citric acid in 200 ml of product water from the
WRO 300 H. This will result in a 2 percent solution in the WRO 300 H.
Refer to Cleaning Procedure below.
3.3.2 Alkaline Cleaning
Alkaline cleaning should be performed when:
• Product performance is affected and cleaning with citric acid does
not improve performance.
• Organic fouling is suspected.
Use MINNCLEAN
®
TF according to manufacture’s instruction.
Refer to Cleaning Procedure below.
3.3.3 Cleaning Procedure
Step 1 Press until the display shows RUN. Wait until the product
water conductivity stabilizes and record the value. Press
until light goes out to stop the WRO.
Step 2 Follow the chemical disinfection procedure, but instead select
WARM CITRIC, or ALKALINE CLEAN in the CHEM SELECT
menu. Refer to Chemical Disinfection Procedure on page 19.
3.3.4 Test for Residuals
Step 1 Press until light goes on, to start the WRO 300 H.
Indication will light and will flash.
Step 2 Collect a water sample from the product water line.
Step 3 The absence of cleaning chemical in the product water is
confirmed if the pH is within 1.0 pH unit of the feed water
value (checked with a suitable method) and if the conductivity
of the product water corresponds to the previously recorded
value.
NOTE
Other acid membrane cleaners may be used as an alternative cleaner
for the WRO 300 H. Follow the manufacturer’s guidelines to prepare
the cleaning solution.
CAUTION
If the temperature is not achieved during Warm Acid cleaning,
alarm 407 INSUFFICIENT TEMPERATURE will appear and the
cleaning procedure has to be restarted.
NOTE
The container can be empty before the intake phase is finished.