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1 General information - PUFFER
This document is intended for the installer and the end user. It must therefore be handed over to the end user or to the
person in charge of managing the system after the system has been installed and started.
Thermal Accumulators
PUFFER, PUFFER 1 and PUFFER 2, PUFFER 1 CTS and PUFFER 2 CTS manufactured by
Cordivari S.r.l. are designed to be used in those heating systems intended to exploit a thermal source with a typically
discontinuous 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. manufactured by Cordivari
In particular the installation of a Puffer combined with a solid fuel generator guarantees the following advantages:
• Allows the generator to operate smoothly, without interruptions due to insufficient demand for energy from the heating
system: in these conditions, 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
exhaustion 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 automatically 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, Puffer thermal accumulators are designed to contain only primary water (so-
called “technical water”) of closed-circuit heating systems. Any use of the product other than the one stated in this
document relieves the manufacturer of any liability and will void any warranty.
Therefore, Puffer thermal accumulators are designed to contain only primary water (so-called “technical water”) of
closed-circuit heating systems. As a consequence, they do not feature any anti-corrosive treatment of the surfaces
coming into contact with water since, under 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. Any use of the product other than the one stated in this
document relieves 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).
The versions that include the presence of one or more heat exchangers allow to use the energy produced by a solar
thermal system and in general to separate more energy sources hydraulically.
The CTS (with Higher Heat Load) Puffers are mainly suitable to optimize the use of the energy stored through the
thermal stratification inside the storage unit. In fact, the lower exchanger, which is positioned at the very bottom, quickly
heats the surrounding water that, channelled by the CTS system, naturally moves up to the storage unit upper part,
being thus immediately available for use. At the same time, the return of cold water is possible thanks to the Cordivari-
patented Labyrinth® spreader preventing it from being mixed and ensuring the separation between the hot (upper) and
cold (lower) parts. Due to the special above-described configuration, the heat probe of the solar system on CTS Puffers
must be compulsorily fitted on the lowest point of the storage system (1
st
hose from the bottom among those devoted to
probe connection).
2 Category identification (Directive 97/23/EC)
According to Directive 97/23/EC the thermal accumulator object of this document are under the provisions stated in
Article 3.3 of the Directive itself. Therefore they do not require EC marking. However, Cordivari S.r.l. 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. Contact 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 sheltered from atmospheric conditions, on an adequate
and solid base, verifying, before making the connections, that there is enough space for the extraction of the devices