Nordica DSA Manuel Utilisateur page 32

Never overload the appliance. Too much fuel and too much air for the combustion may cause overheating and then damage
the product. You should always use the appliance with the door closed in order to avoid damages due to overheating (forge effect).
The adjustment of the registers necessary to reach the rated calorific yield is the following one: see chap. TECHNICAL DESCRIPTION.
The appliance works as an intermittent operating appliance.
In the event that the water temperature exceeds the tripping temperature of the safety devices, immediately
suspend the feeding of wood, and make sure that the water temperature and the flame decrease, eliminating the
causes of the overheating (if necessary by closing the air register). If the water system is connected in the thermo-
fireplace, the hot water tap can be opened to speed up the cooling of the appliance.
Besides the adjustment of the air for the combustion, the intensity of the combustion and consequently the thermal performance of
the device is influenced by the stack. A good draught of the stack requires a stricter adjustment of air for combustion, while a poor
draught requires a more precise adjustment of air for combustion.
To verify the good combustion, check whether the smoke coming out from the stack is transparent.
If it is white, it means that the device is not properly adjusted or the wood is too wet; if instead the smoke is gray or black, it signals
that the combustion is not complete (it is necessary a greater quantity of secondary air).
WARNING: When fuel is added onto the embers in the absence of a flame, a considerable amount of fumes may develop.
Should this happen, an explosive mixture of gas and air may form, and in extreme cases an explosion may occur. For safety
reasons it is advisable to perform a new lighting procedure with the use of small strips.
ELECTRICAL POWER SUPPLY FAILURE
In the event of an unexpected electrical power supply failure during normal system operation, it will be necessary to carry out these
simple manoeuvres to prevent the water in the boiler starting to boil as a consequence of the lack of pump operation.
• Close completely the primary and secondary air registers in order to smother the flame as much as possible.
• Close the smokes register, if existing, to limit further coming of combustive air through possible cracks.
OPERATION DURING TRANSITION PERIODS
During transition periods when the external temperatures are higher, if there is a sudden increase of temperature it can happen that
the combustion gases inside the flue cannot be completely sucked up.
The exhaust gases do not come out completely (intense smell of gas). In this case, shake the grating more frequently and increase
the air for the combustion. Then, load a reduced quantity of fuel in order to permit a rapid burning (growing up of the flames) and the
stabilization of the draught. Then, check that all openings for the cleaning and the connections to the stack are air-tight. In case of
doubt, do not operate the thermo-fireplace.
ATTENTION: never light for any reason if the installation is not completely full of water in order to avoid a serious damage
of the whole structure. The installation must always be full of water even when the thermo-fireplace is not used. A possible
no use during winter season must be faced by adding antifreeze substances.
SUMMER USE
The system must be completely filled with water. The absence of water in the system would lead to serious damage of the entire
structure.
ATTENTION: For no reason must the fire be ignited before the system has been completely filled with water; doing this
would lead to serious damage of the entire structure.
In order to prevent water boiling, the circulation pump must be always in function in order to drain on the radiators, or on the puffer,
or on any other thermal absorption structure the heat given from the boiler to the water.
If the pump does not circulate or for any reason the water temperature exceeds 95°C, acts the DSA valve
discharging heat in the throughway water. It is recommended to supervise the water temperature in the
thermoproduct during summer use to avoid recurrent interventions of the DSA valve which may jeopardize its
good operation.
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