Baxi AGU 2.550 Mode D'emploi page 27

7. ZONE HEATING SYSTEM
If it is not necessary to manage mixed systems, the AGU 2.550 accessory can be used to command zone pumps/electrovalves,
as illustrated below:
The diagrams in this document are purely indicative and must be backed by a technical thermal analysis.
7.1 SCHEME 4
Two zones with ambient unit heating circuits (1 and 2) and 1 zone with room thermostat heating circuit (3).
1 External sensor - terminal block M2 (4-5) on the boiler
2 Circuit 1 zone pump or electrovalve (QX21-N)*
3 Circuit 1 ambient unit - terminal block M2 (1-2-3) of boiler
4 Circuit 2 zone pump or electrovalve (QX22-N)*
* The AGU 2.550 accessory cannot directly command a 3-wire electrovalve. A relay with an exchange contact must be used
instead.
Room units 3 and 5 are connected in parallel.
The room units can directly control their respective zones according to the desired room temperature. Enter menu 2 from the
Remote Control, as described in section 5, and make the following settings:
PROGRAMME
MENU
ROW
5715
5721
5977
CONFIGURATION
6020
6030
6031
742
HEATING CIRCUIT 1
1042
HEATING CIRCUIT 2
The room units can directly control their respective zones according to the desired room temperature. If, when turning the knob
B on the main menu, the display visualises the boiler flow temperature instead of the ambient temperature, parameters 742 and
1042 have not been set correctly.
5
6
7
PARAMETER
Heating circuit 2
Heating circuit 3
H5 input function
Extension module 1 function
Module 1 QX21 relay output
Module 1 QX22 relay output
Flow setpoint with room
thermostat
Flow setpoint with room
thermostat
27
Circuit 2 ambient unit - terminal block M2 (1-2-3) of boiler
Electrovalve or externally powered circuit 3 zone pump
Circuit 3 ambient thermostat (for connection see chapter 8.1)
VALUE TO SET
On
On
Room thermostat
CH3 (terminal block M1 (1-2) on board)
Multifunctional
Heating pump CH1
Circuit 1 pump/electrovalve control
Q2
Heating pump CH
Circuit 2 pump/electrovalve control
2 Q6
Enable modulating flow temperature
---
Enable modulating flow temperature
---
DESCRIPTION
Heating circuit 2 enable
Heating circuit 3 enable
Circuit 3 thermostat enable
-
(heating circuit 1)
(heating circuit 2)
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