Setting The Boiler Parameters - Baxi LUNA HT 280 Installers And Users Instructions

15-3. Connecting the outdoor temperature sensor probe
The SIEMENS model QAC34 outdoor temperature sensor probe (optional accessory) must be con-
nected to terminals 7-8 of terminal board M2 in figure 11.
The procedures for setting the gradient of the temperature curve "kt" vary depending on the acces-
sories connected to the boiler.
a) Without accessories:
The temperature curve "kt" must be selected by setting parameter H532 as described in section 17

"setting the boiler parameters".

See graph 1 for selecting the curve referred to a room temperature of 20°C.
The chosen curve can be shifted by pressing the
modifying the value displayed by pressing the
example show in graph 2 refers to the curve Kt=15.
Increase the value displayed if the room temperature required is not reached inside the premises for
central heating.
Graph 1
b) with QAA73 temperature regulator:
The temperature curve "kt" must be selected by setting parameter 70 "HC1 gradient" of the QAA73
temperature control device as described in section 15.2 "QAA73: parameters which can be set by
the installation (service) engineer".
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 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 17
"setting the boiler parameters".
IMPORTANT: For systems divided into zones, parameter 80 "HC2 gradient", which can be set on
the QAA73 temperature regulator, must be set as _ _ . _ "not active" (see section 15.2).
Graph 3
(2), button (2) on the boiler control panel, and
and . keys. See graph 2 for curve selection. (The
TM = Flow temperature
Te = Composite outside temperature
Sth = Kt Curve
TM = Flow temperature
Te = Composite outside temperature
21
Graph 2