Dismounting The Water-Water Heat Exchanger - DeDietrich MS 24 MI FF Operating And Installation Instructions

32. DISMOUNTING THE WATER-WATER HEAT EXCHANGER

The stainless steel plate-type water-water heat exchanger can be disassembled with a hex wrench by operating as de-
scribed below:
• drain the system, just the boiler if possible, through the drain tap;
• drain the DHW system;
• unscrew the pipe connecting the expansion vessel to the hydraulic assembly;
• remove the heating pressure switch (16H) without disconnecting the cable harness;
• remove the two screws (fig. 16B) at the front securing the water-water heat exchanger and pull it out using the space
created after removing the heating pressure switch;
• clean the heat exchanger and put it back in place;
• screw on the pipe connecting the expansion vessel to the hydraulic assembly;
• put the hydraulic pressure switch back in place.
Figure 16
WARNING
Pay great attention when dismantling the individual parts of the hydraulic assembly.
Do not use sharp tools, do not apply excessive force when removing the fixing clip.
INSTALLATION INSTRUCTIONS
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71.03982.03 - EN