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Figure 16 - top cover removal
Figure 17 - resetting the safety thermostat
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11.2. Inspections
Visual inspection of the general condition of the product and its systems, as well as inspection of the
absence of leaks and the ventilation filter is recommended on a quarterly basis. This must be con-
ducted by qualified professional. Inspection of the tightening of bolts, nuts, flanges and water supply
connections that may have been loosened by vibration, is recommended on an annual basis. This
must be conducted by a qualified professional. We also recommend to check the integrity status of all
magnesium anodes - see section 11.3. below.
11.3. Magnesium anodes
The magnesium anode (Mg), also called “sacrificial” anode, prevents any parasitic current generated in
the product, which can cause corrosion processes on the surface of the product.
In fact, magnesium is a metal with a lower electrochemical potential compared to the material that cov-
ers the inside of the water heater, therefore, it attracts the negative charges that are formed during the
heating of the water causing corrosion. Therefore, the anode “sacrifices” itself corroding in place of the
deposit. The water heater has two anodes; the first is mounted on the bottom and the second on the
top of the tank (the area most affected by corrosion).
The integrity of magnesium anodes should be checked at least once every two years (we recommend
the magnesium anodes are checked at least once per year). The operation must be carried out by qual-
ified personnel. Before performing the inspection, you must:
•
Close the cold water inlet. Empty water from the water heater (see paragraph 11.5).
•
Loosen the upper anode and check its corrosion condition. If more than 30% of the anode surface
has suffered corrosion, it must be replaced.
•
Carry out the same operation for the lower anode.
The anodes have adequate sealing joints to prevent water leakage. It is recommended to use anaerobic
sealant for compatible threads for use in sanitary and heating systems. The joints must be replaced
both in the case of an inspection and in the case of replacement of anodes with new joints.
Summary of Contents for Dalis 200DHW4
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