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EN
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7.4.1 REPLACING THE HEAT EXCHANGER (COIL)
In order to replace the coil either with a new one or with another coil with opposite hydraulic
connections, operate as follows (see Fig. 5):
1. for models with housing (YSF-EST, YSW-EST) remove the frontal panel and the sides as
indicated in paragraph 6.3; loosen the 4 screws that fix the frontal closing and remove
the air outlet kit;
2. remove the screw that fix the filter to the structure (1);
3. loosen the screws that fix the inner closing panel both in front and sideways (2);
4. remove from the sides of the unit the screws that fix the basement of the fan deck to
the structure (3); remove the fan deck by rotating it slightly;
5. if the unit is installed in a 4 pipe system, also remove the antitorsion plate on the hy-
draulic connections side (4);
6. loosen the upper and side screws that fix the coil to the structure (5) and remove it
frontally. Now, it is possible to replace the coil, by using with the same screws. All the
components have to be remounted very carefully and correctly.
7.4.2 REPLACING THE COMPLETE FAN DECK
If necessary, it is possible to replace the complete fan deck as follows:
1. be sure that the unit has been disconnected from the power supply;
2. for the models with casing (YSF-EST, YSW-EST), operate as indicated in paragraph 6.3;
3. for the models YSF-EST/YSIH-EST/YSIV-EST remove the filter fixing plate;
4. remove the filter (Fig. 6-1);
5. remove the inner closing panel by loosening the screws that fix it both in front and
sideways (three on the right side and three on the left side) (Fig. 6-2);
6. remove the power supply cable and be careful not to damage it while removing the fan
deck; it is necessary to have access to the sides of the inner frame: loosen the screws
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Fig. 5
