Baxi AGU 2.550 Mode D'emploi page 29

8. ELECTRICALLY CONNECTING THE AMBIENT THERMOSTAT
The operating temperature is the same for all circuits.
The relays can be replaced with valves equipped with micro limit switches and vice versa.
8.1 CASE - 1 - Connecting a single ambient thermostat in a high temperature zone.
Connect the ambient thermostat to the external electric network
(230V) which will supply the zone valve (or pump) and the relay coil;
connect the relay contact to the boiler M1 terminal block (1-2).
8.2 CASE - 2 - Connecting ambient thermostats for a high temperature multi-zone system.
Connect the ambient thermostat in parallel to the external electric network (230V) which will supply the zone valve (or pump)
and the relay coils; connect the relay contacts in parallel to the boiler M1 terminal block (1-2).
8.3 CASE - 3 - Connecting ambient thermostats for a low temperature multi-zone system.
Connect the ambient thermostats in parallel to the external elec-
tric network (230V) which will supply the zone valves (or pumps)
and the relay coil; connect the relay contact to the AGU 2.550
H2-M terminal blocks.
Connect the thermostat protecting the low temperature
zone in series to the feed of the zone electrovalves so as to
totally close the circuit in case of fault.
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