Baxi LUNA HT 1.350, Instructions Manual

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instructions pertaining to the instaLLer 924.493.3
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13.4 connecting the outdoor temperature sensor
The SIEMENS model QAC34 outdoor temperature sensor (optional accessory) must be connected to terminals 7-8 of
terminal board M2 in figure 9.
The procedures for setting the gradient of the temperature curve “kt” vary depending on the accessories connected to
the boiler.
a) Without Qaa73 room temperature control device:
The temperature curve “kt” must be selected by setting parameter H532 as described in section 15 “setting the boiler
parameters”.
See graph 2 for selecting the curve referred to a room temperature of 20°C.
The chosen curve can be shifted by pressing the button (2) on the boiler control panel, and modifying the value di-
splayed by pressing the and . keys. See graph 3 for curve selection. (The ex­ample show in graph 3 refers to the
curve Kt=15).
Increase the value displayed if the room temperature required is not reached inside the premises for central heating.
b) with Qaa73 room temperature control device:
The temperature curve “kt” must be selected by setting parameter 70 “HC1 gradient” of the QAA73 room temperature
control device as described in section 13.3 “QAA73: parameters which can be set by the installation engineer (service)”.
See graph 4 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 climate control.
If the system is divided into zones, the temperature curve “kt” relating to the part of the system not controlled by the QAA73
must be selected by setting parameter H532 as described in section 15 “setting the boiler parameters”.
graph 2 graph 3
tM = Flow temperature
te = composite outside temperature
sth = Kt curve
graph 4
tM = Flow temperature
te = composite outside temperature
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