Ariston 47-116-17 installation instructions Outdoor Sensor

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.

9	8	7
100
		6
		5
		4
60		3
		2
		1
20
+20		-20

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.

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 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.

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.

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