Baxi LUNA HT 280 Installers And Users Instructions page 22

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.
15-4. Connecting a zoned system
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 temperature regulator, must be set as _ _ . _ "not active".
M1
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.
2 zone
(room
1 zone
thermostat)
solenoid
valve1 zone
M2
22
3 zone N zone
(room (room
thermostat) thermostat)