Cleaning The Lters; Removing Scale From The Dhw Circuit - DeDietrich ZENA MS 24 MI FF Operating And Installation Instructions

The DHW and CH lters are housed in special extractable cartridges. The CH cartridge is located on the CH return line
( gure 16F) while the DHW cartridge is on the cold water input ( gure 16E). To clean the lters, proceed as described below:
taking care not to apply excessive force;
WARNING
when replacing and/or cleaning the O-rings on the hydraulic assembly, only use Molykote 111 as a lubricant, not oil or grease.

31. REMOVING SCALE FROM THE DHW CIRCUIT

The DHW circuit can be cleaned without removing the water-water heat exchanger if the assembly is tted with the special
tap (available on request) located on the DHW outlet. To clean, proceed as follows:
If the special tap is not supplied, dismount the water-water heat exchanger, as described in the next section, and clean it
separately. Remove the scale from the seat and relative NTC sensor tted on the DHW circuit ( gure 16D).
To clean the exchanger and/or DHW circuit, use Cillit FFW-AL or Benckiser HF-AL.
INSTALLATION INSTRUCTIONS
30. CLEANING THE FILTERS
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71.06952.02 - EN