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The type of curve is entered by means of the controls of the display
P.C.B located under the lid of the P.C.B. itself. To access the
programming buttons (+ / -), raise the lid with a screwdriver as shown
in the illustration.
In the event of the chosen curve not being the most suitable for the
type of system, it may be changed (selecting a more appropriate
one) or moved until the desired thermal behaviour is obtained for the
boiler and the system.
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3.6.2. OUTDOOR SENSOR
In the case of the use of an outdoor sensor, the microprocessor-
controlled P.C.B. calculates the most suitable flow temperature,
taking into account the external temperature and the type of system.
The microprocessor is capable of doing this because it is possible to
establish a link between the external temperature and the flow
temperature of the heating system water. This link translates into a
"thermal curve".
The type of curve should be chosen in correspondence with the
planned temperature of the system and the nature of the heat loss
present in the building.
The flow temperature directly influences the room temperature,
therefore making reference to the room temperature is equivalent to
indicating variations in the temperature of the building.
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PROCEDURES AND PRACTICAL EXAMPLES
:
If the building is always cold, under all external temperature
conditions (and therefore in all seasons), the steps to take are as
follows:
The curve must be translated parallel to itself, i.e. raising the flow
temperature (and thereby the room temperature) in parity with the
external temperature.
It is possible to carry out this operation by heating temperature knob.
The konb in vertical position set a temperature oh 20°C. Turning the
knob on the right it’s possible to set a higher room temperature.
In this manner, temperatures for the water coming out of the boiler
are set successively higher, which then influence the room
temperature increasing it to the desired settings.
While turning the knob the display shows “d.xx” for few seconds, “xx”
is the room temperature set. Alternatively, it is possible to lower the
output temperature of the boiler if the room temperature is too hot.
It is possible obtain this turning the knob on the left translating lower
the curve.
NB: The last effect achieved by adjusting the thermal curves is to change
the behaviour of the system in relation to the room temperature. If
the curve used has been selected underestimating the thermal
needs of the building, i.e. it is too “low”, it is possible that the building
will not heat up sufficiently (the boiler will arrive to the set-point
before the building reaches the desired temperature); the result is
that the building will feel cold.