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Instructions for the installer
3.15 Installation of the (optional) external probe and sliding temperature operation
The boiler can be connected to an (optional) external temperature probe (optional, provided by the manufacturer) for sliding temperature
operation.
If an external probe is installed, then it will not be possible to install an ambient probe.
WARNING
Only original external temperature probes supplied by the manufacturer must be used.
If non-original external temperature probes are used, correct operation of the boiler and external probe cannot be guaranteed.
The external temperature probe must be connected by means of a double insulated wire, minimum cross-section 0.35 sq.mm.
The external probe must be connected to terminals (1) and (2) of boiler electronic board.
WARNING
The temperature probe cables must NOT be routed together with power cables.
The temperature probe must be installed on an outside wall facing NORTH - NORTH EAST, in a position protected from weather.
Do not install near a window, ventilation openings or sources of heat.
The external temperature probe automatically modifies the CH flow temperature in relation to:
• Measured external temperature.
• Selected thermoregulation curve.
• Selected fictitious ambient temperature.
The thermoregulation curve is selected via parameter P10.
During adjustment, the set value will flash on LCD. Such value can also be read as parameter TSP10 on the Remote Control (when installed).
The relation between parameter TSP10 setting and the thermoregulation curve coefficient is the following:
• coefficient = TSP10 value / 84.67
The fictitious ambient temperature is set using CH +/- buttons that, with external probe installed, no longer work to set the heating water
temperature (see
Operation with external probe (optional)
on page
14
).
Through boiler parameter P29 it is possible to display the value of the outside temperature detected by the external probe.
The figure shows the curves for a fictitious ambient temperature of 20°C.Parameter P10 allows selecting the curve value shown (see Fig. 18
Thermoregulation curves).
If fictitious ambient temperature value is edited on boiler display, the curves shift up or down, respectively, by the same amount.
With a fictitious ambient temperature setting of 20°C, for example, if you select the curve corresponding to parameter 1 and the outdoor
temperature is - 4°C, the CH flow temperature will be 50°C.
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