Maintenance; Sacrificial Anode Check/Replacement; Boiler Emptying - Ferroli EGEA 90LT Manual De Uso

9. MAINTENANCE

ATTENTION!: Any repairs to the equipment must
be carried out by qualified personnel. Improper
repairs can put the user in serious danger. If your
equipment needs any repair, contact the service
center.
ATTENTION!: Before undertaking any mainte-
nance operation make sure the equipment is not
and cannot accidentally be electrically powered.
Therefore, disconnect the power at every main-
tenance or cleaning operation.

9.1 Sacrificial anode check/replacement

The magnesium (Mg) anode, also called "sacrificial" anode, pre-
vents any eddy currents generated inside the boiler from trig-
gering surface corrosion processes.
In fact, magnesium is a weakly charged metal compared to the
material of which the inside of the boiler is coated, therefore it
attracts first the negative charges that form with the heating of
water, consuming itself. The anode therefore "sacrifices" itself
by corroding itself instead of the tank. The boiler has two an-
odes, one fitted in the lower part of the tank and one fitted in the
upper part of the tank (area more subject to corrosion).
The integrity of the Mg anodes must be checked at least every
two years (preferably once a year). The operation must be per-
formed by qualified personnel.
Before doing the check:
• Close the cold water inlet.
• Proceed with emptying the boiler (see par. "9.2 Boiler empty-
ing").
• Remove the bottom cover 1.
• Disconnect the heating element safety thermostat electrical
connection from the power board and remove the water NTC
probes from the dedicated pipe in the element flange.
• Remove the flange by unscrewing the bolts 3. The corrosion
of the anode 4 can then be checked; if it affects more than 2/3
of the anode surface, proceed with replacement.
100
EN
The flange has a special gasket which must be replaced if the
anode is checked or replaced.

9.2 Boiler emptying

If not in use, especially in case of low temperatures, it is advis-
able to drain the water inside the boiler. For the equipment in
question, just open the drain cock as per the example hydraulic
connections chap. "Plumbing connections" on page 81 (see
fig. 15).
NB!: In case of low temperatures, remember to empty the
system to avoid freezing.
Any maintenance operation must be carried out by quali-
fied personnel according that prescribed in the chapter
10 of this manual.
cod. 3541T580 - Rev. 00 - 12/2019
EGEA
90LT - 120LT
3
4
2
1
fig. 42
4
fig. 43