Instructions for the installer
60
3.13 Room temperature installation
The boiler can be connected to sensor for room temperature measurement (supplied as standard).
WARNING
Only original ambient temperature probes supplied by the manufacturer must be used.
If non-original ambient temperature probes are used, correct operation of the boiler and ambient probe cannot be gua-
ranteed.
The room temperature sensor must be connected by means of a double insulated wire, minimum cross-section 0.35 mm².
The ambient probe must be connected to terminals (13) and (14) of boiler electronic board.
WARNING
The ambient temperature probe cables must NOT be routed together with power cables.
The ambient probe must be installed on an indoor wall at a height of approximately 1.5 m from the floor and in a suitable location for
measuring ambient temperature: do not install in recess or corners, behind doors or curtains, and install away from heat sources,
direct sunlight, air draughts and water sprays.
Once ambient probe has been installed, set the following parameters (refer to TSP parameters on page
62
):
• P17 = 1
• P57 = 1
• P61 = 3
The ambient probe automatically modifies the CH flow temperature in relation to:
• Measured ambient temperature.
• Selected ambient temperature.
Through boiler parameter P49 it is possible to display the value of the ambient temperature detected by the probe SA1.
3.14 Selecting the operating range in heating mode
Heating water temperature adjustment range depends on the selected operating range.:
• standard range:
from 20°C to 78°C (pressing CH +/-);
• reduced range:
from 20°C to 45°C (pressing CH +/-).
The standard range is active with curves P10
≥1, while the reduced range is active with curves
P10 <1.
The two ranges can also be selected even with the external probe disconnected.
The waiting time between one boiler ignition and the following one, used to prevent boiler frequent turning on and off is 4 minutes for
both ranges, and can be edited with the parameter P11.
If system water temperature decreases below a certain value, the waiting time is reset and the boiler re-ignited, as shown in the fol-
lowing table:
Selected range
Re-ignition temperature
Standard range
< 30°C (P27)
Reduced range
< 20°C
Tab. 15 Boiler re-ignition temperature
Operation range selection is to be implemented by a qualified installer or a Service Centre.