Baxi LUNA HT 1.850 Installers And Users Instructions page 25

Graph 4
c) with AGU2.500 device 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.
In this case the set of some electronic parameters have to be modified (see § 15: H552-H553-H632).
H552=50 H553=12 H632=00001111
The electrical connection and settings needed to control a system divided into zones vary depending on the accessories
connected to the boiler.
a) Without QAA73 room temperature control device:
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 11. 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 room temperature control device:
The pump relating to the room controlled by the QAA73 room temperature control device must be supplied with electricity
by means of terminals 11-12 of terminal board M3 in figure 11.
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 11. 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.
In this case the set of some electronic parameters have to be modified (see § 15: H552-H632).
H552=50 H632=00001111
INSTRUCTIONS PERTAINING TO THE INSTALLER
TM = Flow temperature
Te = Composite outside temperature
13.5 CONNECTING A ZONED SYSTEM
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910.024.1 - EN (AUS)