Baxi LUNA HT 380 Notice D'installation Et D'entretien page 33

11.3.1 One Zone system with QAA 73 and optional Outdoor reset
Fig. 26
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.
With a QAA73 Controller:
The temperature curve "kt" must be selected by setting parameter 70 "HC1 gradient" of the QAA73 remote control device
as decribed in section 12.6 "QAA73: parameters wich can be set by the installation engi-neer (service)". 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 appliance's electronic control system
provides a central heating output temperature equal to the highest of the two values set on the QAA73 and in the boiler.
Note:
The jumper on the M1 bus terminal between conections 1 & 2 must be removed (fig. 23 - see Section 11.1).
INSTALLATION AND SERVICING INSTRUCTIONS
33
7109741.01 - en