Check/Replacement Of The Sacrificial Anode; Emptying The Boiler - Ferroli EGEA 90 LT Manuel D'utilisation, Installation Et Entretien

fig. 44- Safety thermostat reset
The intervention of the safety
thermostat may occur due to a
fault in the control board or the
ATTENTION
absence of water in the boiler
tank.
NB!: The intervention of the thermostat ex-
cludes the operation of the electrical resist-
ance but not the heat pump system within the
allowed operating limits.
If the operator is unable to elim-
inate the fault, switch off the
equipment and contact the Tech-
ATTENTION
nical Assistance Service, com-
municating the model of the
product purchased.
7.3 CHECK/REPLACEMENT OF THE
SACRIFICIAL ANODE
The integrity of the Mg anodes must be checked at least
once every two years (once a year is recommended). The
check should be carried out by a qualified technician.
The magnesium anode (Mg), also known as an "sacrificial" an-
ode, prevents any eddy currents generated inside the boiler
from triggering surface corrosion.
Magnesium is, in fact, a less noble metal than the material lin-
ing the inside of the boiler, therefore, it attracts the negative
charges first that are formed by heating the water, and is con-
sumed. The anode, therefore, "sacrifices" itself and corrodes
instead of the boiler tank. The boiler has two anodes, one fitted
in the lower part of the tank and one fitted in the upper part of
the tank (area more subject to corrosion).
148
EN
Before carrying out the check, you must:
• Close the cold water inlet.
• Proceed with emptying the boiler (see par. "7.4 EMPTYING
THE BOILER").
• Remove the bottom cover 1.
• Disconnect the heating element safety thermostat electri-
cal 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.
The flange has a special gasket which must be replaced if the
anode is checked or replaced.
7.4

EMPTYING THE BOILER

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 hydrau-
lic connections chap. "6.7 HYDRAULIC CONNECTIONS" on
page 137 (see fig. 35).
NB!: In case of low temperatures, remember
to empty the system to avoid freezing.
cod. 3541T580 - Rev. 06 - 04/2022
EGEA
90 LT - 120 LT
3
4
2
1
fig. 45
4
fig. 46