Operating Conditions - Cordivari PUFFER Bedienungshandbuch

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 domestic water supply must be made by a group of
hydraulic safety conforming 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
operation of the boilers themselves.
Ensure that the technical room, where the equipment will be located, has opening of sufficient size to allow the free
passage out of it without having to operate demolitions of any kind. Ensure that the room of installation is equipped with
a drain (discharge) system appropriate to the cylinder volume and any other equipment. The warranty does not cover
any costs arising from defaults at this point.
The installation and operation of the equipment covered by these instructions must always respect the national and local
rules and regulations of the installation site, in particular in relation to prescribed safety and control accessories.
The formation of ice inside the thermal accumulator can cause serious damages to the system and destroy the
equipment. Therefore where there is a danger of below-zero temperatures, the thermal accumulator and the heating
system must be protected.
Since the temperature of the domestic hot water contained in the inner tank cannot be limited, i.e. it tends to raise to the
temperature of the primary circuit, to avoid the danger of burnings, it is strongly recommended to install a thermostatic
mixing valve on the domestic hot water outlet.
In case water with a hardness value higher than 25÷30 °Fr is used, it is necessary to carry out a chemical
conditioning treatment on domestic water system inlet so as to prevent any possible scale due to hard water or
corrosion due to aggressive water.
In general, heating plants producing domestic hot water, are always subject to water treatment aiming to reduce
damages from lime scale. In Combi thermal accumulators these treatments become even more important and
necessary because of the impossibility to control the temperature of the accumulated sanitary water.
In order to avoid the effects of any stray galvanic currents it is always necessary to provide a PROPER GROUNDING of
the systems.
4 Commissioning
Before commissioning a new water system, all pipes and equipment internal parts must be washed so as to prevent any
residues from previous machining, dirt, etc. from remaining inside them and leading to problems and malfunctions. The
washing procedure can be carried out by using special cleaning solutions inhibiting the corrosion on heating side and by
simply letting mains water flow inside the high-capacity domestic water circuit for at least ten minutes.
During commissioning, the performance of a leak test (pressure test) is strongly recommended.
5 Connections
The thermal accumulator reports on its label the generic use of its connections. Therefore it is up to the heating system
designer to evaluate, in respect of the laws and regulation in force at the installation site, the best possible plant
diagram, in compliance with the limits (pressure and temperature), declared by the manufacturer.
6 Recommendations
The manufacturer, in order to adapt the product to the technological progress and to special manufacturing, installation
and positioning requirements may decide to make changes without previous notice. As a consequence, even if the
images shown in this manual slightly differ from your equipment, the safety and indications on equipment use are
nevertheless ensured.
7

Operating conditions

Respect the limits of pressure and temperature indicated on the equipment label plate.
Caution! During installation always take care to fill the domestic hot water inner cylinder first (domestic hot
water side) before filling the main cylinder with heating water (heating water side). In operating conditions
always avoid that the pressure of the thermal accumulator exceeds the one of the boiler by more than 1.5 bar
8 Disposal
At the end of the product life-cycle its metallic components should be handed over to operators
authorised to collect metallic materials for recycling purposes, while non-metallic components should be
handed over to operators authorised to dispose of them. If disposed of by the end customer, the products
must be managed as urban waste and therefore in compliance with the municipal regulations of the
relevant municipality. In any case they should not be managed as household waste.
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