Replacement Of The Protective Magnesium Anode; Cleaning Of The Storage Tank - Nibe BA-ST 9022 - 2FE Installation And Operating Manual

INSTALLATION AND OPERATING MANUAL
5.3 Replacement of the Protecti ve Magnesium Anode
Replace the protecti ve magnesium anode every 18 months
(regardless the measurement). Instead of the magnesium
anode, you can use the ti tanium anode. Install it in accordan-
ce with the anode installati on manual.
CAUTION
Replace the protecti ve magnesium anode every 18
months. Its ti mely exchange and proper installati on
are the conditi ons to maintain the warranty on the sto-
rage tank.
When replacing the magnesium anode, follow the procedure
below (see Fig. 12):
1. In units with the electric heati ng unit installed, discon-
nect power from the unit fi rst.
2. Switch the storage tank coil heaters OFF and wait unti l
the water inside cools down.
3. Cut-off the hot water supply and drain some water from
the tank through the drain valve (see Fig. 9 item 4).
4. Remove the housing cover together with thermal insula-
ti on (1).
5. Remove the anode protecti ve conductor (2).
6. Remove the worn magnesium anode (3).
7. Screw the new magnesium anode.
8. Connect the anode protecti ve conductor to the storage
tank.
9. Fill the tank with water and vent it as described in par. 4.2
Start-Up.
10. Check ti ghtness of the installed anode.
11. Reinstall the thermal insulati on and the housing cover.
Once making the above steps, the storage tank is ready to use.
Ensure that the anode protecti ve conductor is connected to
the storage tank top head aft er installing the new isolated ma-
gnesium anode. Lack of contact between the anode and the
tank will interfere operati on of the anode and the tank will
not be protected against corrosion.
Fig. 12 Replacement of the protecti ve magnesium anode
Connect the anode protecti ve conductor to the M5 pin fi xed
to the top head of the storage tank.
10
1
3
2

5.4 Cleaning of the Storage Tank

Boiler scale is precipitated from the heated water during the
storage tank operati on. The amount of deposited scale de-
pends on the water hardness, the operati ng temperature and
operati ng ti me. Heati ng surfaces covered with boiler scale re-
duce the heat output of the storage tank, increase power con-
sumpti on and extend the heati ng ti me. It is recommended to
clean the storage tank from deposits at least once every two
years. In the case of hard or very hard water, cleaning should
be carried out at shorter intervals.
Storage tank cleaning procedure:
1. Prepare a new inspecti on opening gasket. The old gasket
may not be reused (for the list of the inspecti on opening
gaskets, see Secti on 6 Accessories and Spare Parts).
2. In storage tanks with the electric heati ng unit installed,
disconnect power from the unit fi rst.
3. Switch the storage tank coil heaters OFF and wait unti l
the water inside cools down.
4. Cut-off the hot water supply and drain the storage tank
through the drain valve (see Fig. 9 item 4)
5. Remove the inspecti on opening blanking plate and gasket
6. Remove the inspecti on opening screws and fl anged co-
ver and fl ush the storage tank and remove accumulated
sludge and lime slurry. If necessary, remove lime deposits
from the coil – this guarantees a proper heat exchange.
Pay special att enti on to not damage the ceramic enamel
coati ng.
7. Replace a new gasket and the inspecti on opening fl anged
cover. Screw ti ghtening torque: 35±5 Nm.
8. Fill the tank with water and vent it as described in par. 4.2
Start-Up.
9. Check ti ghtness of the inspecti on opening.
10. Replace the insulati on and inspecti on opening blanking
plate.
Once cleaned, the unit is ready to use.
Informati on
During mechanical cleaning, be careful to not damage
the enamel. In the case of chemical cleaning, pay special
att enti on to neutralize the chemicals used for cleaning.
Torque
35 ± 5 Nm
Fig. 13 Installati on of the inspecti on opening cover (moun-
ti ng order).
Hot Water Storage Tank with Two Coils
BA-ST 9022/9100 - 2FE