Instructions For Cleaning The Screen - Uvar UDI 6Matic 706M002 Maintenance Manual

Maintenance Manual - 6Matic.

9.7 - Instructions for cleaning the screen

It is recommended that the filter screen is removed annually for cleaning and checking, or sooner if
the pressure drop does not decrease after three consecutive flushing cycles using the differential
pressure switch.
Cleaning with a high pressure cleaner:
Use a high pressure cleaner (100-120 Bar) with clean water.
Clean the screen from the outside by holding the lance of the high pressure cleaner close to the
screen and cleaning the screen with even movements. Ensure overlapping movements, so that all
parts of the filter screen are cleaned evenly.
Then clean the filter screen with the high-pressure cleaner from the inside to the outside.
If the cleaning of the filter element according to the above method does not give the desired result,
we recommend chemical cleaning of the screen.
Chemical cleaning:
First of all, the filter screen must be fully dismantled, see instructions from chapter 9.5-A 1 to 9.
All mechanical parts such as the reversing mechanism, the dirt collector and all seals must be
removed before the filter screen is chemically cleaned.
Always choose one of the cleaning methods below, never combine cleaning methods.
Only after thorough rinsing of the filter screen with clean water is it allowed to change the
chemical cleaning method.
Always read the chemical manufacturer's safety instructions before use and observe all
prescribed safety measures.
In the case of inorganic contamination (deposit of minerals):
This contamination can be removed by immersing the filter screen for a period of approximately 15
minutes in a solution of acid (for example nitric acid, HNO3) diluted to a pH 2 or a concentration of
approximately 1%.
In the case of organic contamination (for example bio-film):
This contamination can be removed by immersing the filter screen for a period of approximately 30
minutes in a solution of alkaline (for example Sodium hypochlorite, NaOCl) with a maximum
concentration of 0.1%. Sodium hydroxide (NaOH) can be used up to a pH of 12.
Never leave the filter screen immersed in a chemical solution for longer period than strictly necessary.
Rinse with clean water:
After chemical cleaning, rinse the filter strainer thoroughly with clean water.
Check:
Visually check if the filter screen is clean, if this is not the case, repeat the cleaning process.
Installation:
Place the filter element back into the filter housing according to the assembly instructions from
chapter 9.5-C 1 to 9.
Commissioning:
Perform the start-up procedure for the filter as described in chapter 6.
UDI 5-3-2020
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