Baxi LUNA3 SYSTEM HT 1.180 MP Installers And Users Instructions page 56

The electrical connection and settings needed to control a system divided into zones vary depending on the accessories
connected to the boiler.
a) Without accessories:
The contact relating to the request for operation of the various zones must be parallel-connected and connected to terminal
3-4 "TA" of terminal board M2 in figure 12. The jumper present must be removed.
The central heating temperature is selected directly on the boiler control panel in accordance with the instructions provided
for the user in this manual.
b) with Qaa73 temperature control device:
The zone valve or pump relating to the room controlled by the QAA73 temperature control device must be supplied with
electricity by means of terminals a-b of terminal board M1 in figure 12.
The contact relating to the request for operation of the other zones must be parallel-connected and connected to terminal
3-4 "TA" of terminal board M2 in figure 12. The jumper present must be removed.
The central heating temperature of the zone controlled by the QAA73 is set automatically by the QAA73 itself.
The central heating temperature of the other zones must be selected directly on the boiler control panel.
IMportant:
For systems divided into zones, parameter 80 "HC2 gradient", which can be set on the QAA73 tem-
perature regulator, must be set as _ _ . _ "not active".
Figure 12
c) with aGu2.500 for control of a low temperature system:
Refer to the instructions provided with the AGU2.500 accessories for connection and control of a low temperature zone.
InstructIons pertaInInG to the InstaLLer
15.4 ConneCtIng a zoneD system
2 zone
(room
1 zone
thermostat)
solenoid
valve1 zone
56
3 zone n zone
(room (room
thermostat) thermostat)
925.916.2 - GB