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INSTALLATION AND MAINTENANCE MANUAL FOR
VITRIFIED TANKS AND INTERACUMULATORS
1.- Generalities
This document is intended for the installer and the end
user. Therefore, after commissioning of the installation, it
is necessary to ensure that this manual is delivered to the
end user or the person responsible for managing the
installation.
The products that are the object of this document have
been manufactured according to the 2014/68 / CE
directive relative to the pressure devices in accordance
with the fluid contained in them and the conditions of use
contemplated for their use.
2.- Instalation and maintenance
• The tanâ must alïays be sheltered from atmospheric
agents, on a solid base, verifying before installation that
there is sufficient space for the extraction of anodes,
resistances, instrumentation and to facilitate the opening
of the manhole.
• It must be ensured that the room intended to contain the
tank is provided with an access to the exterior with the
appropriate dimensions to facilitate the passage of the
apparatus without the need to carry out any demolition
work. The guarantee does not cover the occasional costs
derived from the breach of this point.
• It must also be ensured that the local referral is equipped
with a drainage system appropriate to the volume of the
accumulator and other possible devices. The guarantee
does not cover the occasional costs derived from the
breach of this point.
• The inlet connection of the domestic cold water to the
domestic water network must be made by means of a
hydraulic safety group that includes at least a shut-off
tap, a check valve, a check valve control device, a
control device hydraulic load interruption, all accessories
necessary to use the accumulator efficiently and safely.
• If the pressure of the domestic water supply system
could exceed the design pressure value of the tank, a
pressure reducing valve should be installed as far as
possible from the same tank. In order to prevent
pressure shocks that damage the tank, it is always
necessary to install an expansion vessel.
For tanks with water-fed primary at a temperature of less
than 100 ºC, the expansion system must consist of an
exhaust valve, of counterïeight or spring type, ïith an
outlet diameter (mm) not less than (V / 5) 1 / 2, ïhere V is
the volume (lts) of the tanâ, ïith a minimum of 15 mm. The
valve must be set at a pressure not higher than the
design pressure. In addition to the exhaust valve, it is
advisable, to avoid continuous openings, to install an
expansion vessel of the closed membrane type.
In order for the product to have effective protection
against electrochemical corrosion and to fulfill the
guarantee, it is necessary to always provide cathodic
protection for each material. HTW provides as standard in
its internally vitrified tanks magnesium anodes that must
be replaced periodically. The correct installation of the
tanks (according to the instructions provided with the
material), as well as proper maintenance, is essential to
guarantee the useful life of the tank. To avoid eventual
galvanic wandering currents, it is essential to connect the
tank to an earth connection. Failure to comply with these
rules invalidates the guarantee offered by HTW.
The progressive consumption of the magnesium anode
can vary depending on the nature of the water and the
conditions of use. It is necessary to program the periodic
replacement of the magnesium anode, with a maximum
periodicity of 18 months.
The minimum periodicity for cleaning the accumulator is
one year, according to RD 865/2003 for the prevention
and control of legionellosis. Cleaning and maintenance is
essential to guarantee the life of the accumulator.
Maintenance and cleaning tasks must be recorded in the
maintenance log, in accordance with article 8 of RD
865/2003. If disinfection is necessary, it may be done by
thermal or chemical means, complying with Annex 3 of
the aforementioned Royal Decree.
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