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Cod. 1910000001094 - nv01
1. General information
This document is intended for the installer and the end user. It must there -
fore be handed over to the end user or to the person in charge of manag -
ing the system after the system has been installed and started.
The combined thermal accumulators COMBI 1, 2, 3 XC/WC VT pro
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duced by the manufacturer, are designed to be used in those heat -
ing system with simultaneous production of heating and domestic hot
water, with one or more heat sources typically working on discontinu
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ous mode. In fact, thanks to their ability to store heat they are used in
heating systems operating on solid fuel boilers, heat pumps and solar
thermal systems. Combi thermal accumulators always consist of two
chambers of which one, the main chamber serves as thermal accu
-
mulator and the second one (contained inside the first one) is used to
store the domestic hot water. Combi 2 and Combi 3 are also provided
respectively with 1 and 2 helical coil/s, allowing the use of the energy
produced by a solar thermal system and in general to separate more
energy sources hydraulically.
The main cylinder of the Combi connected to a traditional solid fuel boiler,
guarantees the following advantages:
• Allows the generator to operate smoothly, without interruptions due to
insufficient demand for energy from the heating system: in these con -
ditions, rather than stopping the combustion or overheating the rooms,
the generator can be operated continuously storing energy in storage
unit. This energy will become available later when the progressive ex
-
haustion of the fuel will reduce the power supplied by the boiler. The
operation without any interruptions reduces smoke emissions and the
fouling of the chimney, it protects the boiler from harmful formation of
condensed tar, and increases the overall performance of the system.
• It is a “thermal flywheel” for the heating system and greatly increases
operator comfort, making it very similar to that of automatic gas/diesel
systems. In fact, the energy contained in the form of hot water is au
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tomatically transferred to the heating system when it is needed. This
ensures even a few hours of heating when the boiler is off, for example
in the early hours of the morning.
Therefore, the Combi thermal accumulators main volume is designed to
contain only primary water (so-called “technical water”) of closed-circuit
heating systems. As a consequence they do not feature any anti-corro
-
sive treatment of the surfaces coming into contact with water since, un -
der standard intended operating conditions, the technical water does not
originate any corrosive process. Any corrosive-related problem (of the
surfaces in contact with technical water) cannot be attributed to product
defects, but to product misuse.
The secondary cylinder is instead thought to contain domestic hot water
that warms up because the secondary cylinder is “immersed” in the main
cylinder.
Any use of the product other than the one stated in this document re
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lieves the manufacturer of any liability and will void any warranty.
If the accumulator is connected to a biomass generator (wood, chip or
pellet boiler), it is advisable to install on the return pipe to the generator
a suitable device keeping return temperature at a constant level; such
device must consist of a mixing valve (either motorised or automatic) to
prevent the back flow inside boiler of water at too a low temperature and
thus ensuring considerable advantages (increase of generator lifetime)
thanks to the elimination of thermal shocks and the reduction of corrosion
risks due to condensate development).
2. Category identification
(Directive 2014/68/EU)
According to Directive 2014/68/EU the thermal accumulator object of this
document are under the provisions stated in Article 4.3 of the Directive
itself. Therefore they do not require EC marking. However, the manufac
-
turer guarantees, as established by the Directive, a sound engineering
practice (assured by the Quality System ISO 9001) which ensures safe
operation and identification of the manufacturer.
3. Installation and Maintenance
Warnings
The manufacturer's liability is limited to the supply of the equipment. Your
system must be professionally made - in compliance with the prevailing
instructions and professional regulations - by qualified staff, acting on
behalf of companies taking the full responsibility of the whole system.
The manufacturer cannot be held responsible for modifications made to
the product without previous authorization and for the use of non-original
spare parts.
Do not touch product hot parts, such as water inlet and outlet pipes. Con
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tact with such surfaces may lead to serious burns.
The handling of equipment whose weight exceeds 30 kg requires the use
of suitable means of lifting and carrying. To this end, the containers must
be handled only when empty. The pallet that eventually comes with the
device should be removed before installation. If the insulation comes not
mounted, please note that it must be mounted on the equipment before
connecting the pipes.
Thermal accumulators must always be installed so that they are shel
-
tered from atmospheric conditions, on an adequate and solid base, veri -
fying, before making the connections, that there is enough space for the
extraction of the devices directly connected to it (like for example the
electrical heating element or, for thermal accumulators combined with
HSW tank, the magnesium anode) and for the usual maintenance opera
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tions. Under no circumstances tank must be "hanged" to pipes.
For thermal accumulators combined with an integrated domestic hot
water volume, provide adequate expansion systems both for thermal
accumulator (calculated taking into account also the volume of the heat
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ing system) and for the cylinder containing domestic hot water. Always
comply with rules and laws in force at the installation site, considering
also the type and power of the connected generator/s. On the domestic
hot water circuit, even when laws and local rules and regulations state
that the expansion system can only consist of appropriately sized safety
valves, it is recommended to install an expansion tank, closed non-toxic
membrane type, to avoid continuous opening of the safety valve and to
absorb water hammers on the domestic hot water side.
Where required, the connection of domestic cold water inlet to the do
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mestic water supply must be made by a group of hydraulic safety con -
forming with EN 1487:2002, including at least one shut-off valve, a check
valve, a check valve control device, a safety valve, one hydraulic load
breaking device and all the other accessories necessary for safe opera
-
tion of the boilers themselves.
English
User Manual COMBI