8
Chapter 4 |
Chapter 5 |
Connection and start-up
Maintenance
Hot Water Storage Tank with Coil
WTB 220-400
• Check the operation of the safety valve as de-
scribed by the manufacturer of the valve.
• Clean the inside of the storage tank periodical-
ly. Cleaning intervals depends, among the other
things, on the hardness of the water present in a
given area.
• To ensure optimum protection of the storage tank
against corrosion, we recommended checking the
level of wear of the isolated magnesium anode
once every 2 years.
• The isolated protective anode earth conductor
must be connected to the steel components of the
storage tank (top bottom of the tank). Otherwise,
the tank will not be protected against corrosion.
• In order to eliminate any odour of hydrogen sulphide
(caused by bacteria in the oxygen defi cient water),
we recommend observing the periodic cleaning of
the tank and replacement of the electrode and, in
addition, from time to time and independently of the
normal temperature setting, overheating the water
in the tank to a temperature above 70 °C. This also
eliminates the risk of Legionella bacteria growth.
• In the systems with the electric heating unit, en-
sure that the electrical installation is properly pro-
tected by protective circuit.
• When heating water using a coil, limit the temper-
ature of the heating medium to 80°C, it will be pos-
sible to avoid turning on the temperature limiter.
• In order to reduce the possibility of scalding by the
water, we recommend installing a anti-scalding
valve.
• Report any malfunctions in the storage tank op-
eration to the authorized service centres. You can
fi nd the complete list of our authorized service
centres at our website.
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
Storage tanks with one coil of WTB Series are, in
order to protect them against corrosion, coated in-
side with ceramic enamel and in addition, protected
with isolated protective magnesium anode. The an-
ode corrodes fi rst under normal operation, thus pro-
tecting the storage tank jacket. Therefore, you have
to inspect its condition from time to time. Corrosion
rate of the protective anode is diff erent and depends
upon the quality of water in the area. We recommend
checking the protective anode condition once every
2 years in order to ensure optimum corrosion pro-
tection.
• Activate the heating medium circuit or electric
heating unit if the tank is not fi lled with water.
•
Use the storage tank, if you fi nd any malfunction
of the safety valve.
•
Install any device (such as cut-off and/or check
valves, etc.) between the storage tank and the
safety valve (except T-pipes).
• Make any unauthorized repairs.
• Stop water leaks from the safety valve.
• When heating with only the electric unit, the coil
circuits may not be isolated.
Warnings and Practical
Requirements
Inspection of the Protective
Magnesium Anode
We recommend the following
It is forbidden to
5 Maintenance
Fig. 8
Insulated protective magnesium anode.
NOTE
The use of the isolated anode allows you to
monitor the degree of wear of the anode by
measuring 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 contributes to the
reliability and long lifetime.
Caution
It is possible to grow Legionella bacteria in
domestic hot water. To eliminate this danger,
it is recommended to heat the water to 70°C
once a week and keep it at this temperature
for 5 minutes.
Caution
Check the safety valve performance as spe-
cifi ed by the valve manufacturer periodically
(min. every 14 days) or before each start-up of
the heater after decommissioning.
