Connecting The Outdoor Temperature Sensor Probe - Baxi LUNA HT 1.450 Installation And Servicing Instructions

11.3 CONNECTING THE OUTDOOR TEMPERATURE SENSOR PROBE

The SIEMENS model QAC34 outdoor temperature sen-
sor probe (optional accessory) must be connected to ter-
minals 7-8 of terminal board M2 in figure 23.
The procedures for setting the gradient of the tempera-
ture curve "kt" vary depending on the accessories con-
nected to the boiler.
a) Without the QAA73 remote control
When an outdoor temperature sensor is connected, the
central heating temperature control knob (fig. 24) shifts
the heating curves (graph 2).
Turn the knob clockwise to increase room temperature,
anti-clockwise to decrease it. Figure 24 shows the cor-
rect position 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 described
in section 12.5.
Graph 1 shows the available temperature curves.
b) with QAA73 remote control:
The temperature curve "kt" must be selected by set- ting
parameter 70 "HC1 gradient" of the QAA73 remote con-
trol device as described in section 12.6 "QAA73: param-
eters which can be set by Qualified Service Engineer".
Graph 1
Graph 3
INSTALLATION AND SERVICING INSTRUCTIONS
TM = Flow temperature
Te = Composite outside temperature
40.0 30.0
35.0 27.5
Fig. 24
See graph 3 for selecting the curve referred to a room
temperature of 20 °C.
The curve is shifted automatically on the basis of the
room temperature set using the QAA73 remote control.
If the central heating system is divided into more than
one zone, the temperature curve must be set on the
QAA73 and in the boiler (see section 12.5). The appli-
ance's electronic control system provides a central heat-
ing output temperature equal to the highest of the two
values set on the QAA73 and in the boiler.
Graph 2
25.0 20.0 17.5 15.0
22.5
32
12.5
10.0
7.5
5.0
2.5
7110242.02 - en