Baxi LUNA HT 1.450 Installation And Servicing Instructions page 35

11.4.2 One Zone system over external Thermostat without QAA 73
Fig. 27
In an application utilizing a high loop temperature it is strongly recommended that an outdoor temperature sensor be used.
This will allow the boiler to take into consideration the outdoor temperture with respect to the loop temperature allowing
the system to run at a lower heating supply temperature as the outdoor temperature increases. This will allow the unit to
condense more, resulting in a higher effeciency.
Without a QAA73 Controller:
When an outdoor temperature sensor is connected, the central heating temperature control knob (fig 24 - section 11.3)
shifts the heating curves (graph. 2) Turn the knob clockwise to increase room temperature, counterclockwise to decrease
it. Figure 24 shows the correct positions of the knob for operation without shifting the curves. Modify parameter 532 on
the QAA73 remote control to select the desired temperature curve "Kt", as instructed in section 12.5.
Graph 1 shows the available temperature curves.
INSTALLATION AND SERVICING INSTRUCTIONS
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7110242.02 - en