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5 Maintenance
Periodic inspections and maintenance are the condi-
tions of continuous operational readiness, reliability
and a long service life of the product.
Maintenance activities include the following:
•
Routine inspections and replacement of the pro-
tective magnesium anode.
•
Cleaning of the storage tank.
CAUTION
Check the safety valve performance as spec-
ifi ed by the valve manufacturer periodically
(min. every 14 days) or before each start-up
of the heater after decommissioning.
Inspection of the
Protective
Magnesium Anode
Storage tank BA-ST 9030/9040/9050 - 1FEDC with coil
is, in order to protect them against corrosion, coated
inside with ceramic enamel and in addition, protected
with isolated protective magnesium anode. The anode
corrodes fi rst under normal operation, thus protecting
the storage tank jacket. Therefore, you have to inspect
its condition from time to time. Corrosion rate of the
protective anode is different and depends upon the
quality of water in the area. We recommend checking
the protective anode condition once a year in order to
ensure optimum corrosion protection.
TIP
The use of the isolated anode allows you to mon-
itor the degree of wear of the anode by measur-
ing the intensity of the protecting direct current
without having to remove it and empty the tank
(interrupting operation of the storage tank). This
solution simplifi es operation and additionally con-
tributes to the reliability and long lifetime.
Fig. 8 Insulated protective magnesium anode.
Hot Water Storage Tank with large surface coil
BA-ST 9030 - 1FEDC
BA-ST 9040 - 1FEDC
BA-ST 9050 - 1FEDC
Protective Isolated
Magnesium Anode
Measurement of the
Protective Magnesi-
um Anode Wear
In order to check the degree of wear of the anode, do
the following (see Fig. 11):
1.
Remove the housing cover together with thermal
insulation.
2. Disconnect the connecting conductor (protective)
from the storage tank top head.
3. Connect an electric meter (range in mA) between the
protective conductor and the M5 threaded pin and
measure the intensity of the protective direct current.
Intensity of the protective direct current should not
be lower than 0.3 mA at full storage tank. If it is too
low, remove the anode and check its wear visually. If
the anode is signifi cantly corroded (above 50 % loss),
replace it immediately. Connect the anode protective
conductor to the tank after the measurement.
CAUTION
If the current intensity measurements do not
indicate any wear of the anode, its max oper-
ating time is not longer than 18 months. The
anode should be replaced after this time.
PE
Fig. 9 Measurement of the protective direct current
intensity.
Replacement of the
Protective Magnesi-
um Anode
Replace the protective magnesium anode every 18
months (regardless the measurement). Instead of the
magnesium anode, you can use the titanium anode. In-
stall it in accordance with the anode installation manual.
CAUTION
Replace the protective magnesium anode
every 18 months. Its timely exchange and
proper installation are the conditions to
maintain the warranty on the storage tank.
0,3 mA
M5 pin
Chapter 5 |
Maintenance
9
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