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Siemens
Central apartment unit QAX910
CE1N2707en
Building Technologies
06.01.2009
When power is restored, the central apartment unit and its components will resume
normal control operation.
To facilitate fault tracing, the QAX910 delivers detailed error messages.
They are output as clear-text messages, thus simplifying the interpretation of mes-
sages by the user or the heating engineer.
Error messages can be used for triggering other events, such as optical or audible
alarms.
The last 10 error messages are saved as a history and can be individually re-
trieved.
The central apartment unit can be reset to its supply state via an operating line.
Application examples
K
Y
Y
M2
2707H04
M1
B
E
E
T
T
M1 Room
group
pump
M2
DHW diverting valve
E Heating
circuit
T
Room unit and / or
room temperature sensor
Y
Heating circuit valve (2-position) or
radiator control actuator SSA955
B DHW
sensor
K Electric
immersion
heater
Error messages
Supply state
1 room group with
room temp. control
and DHW heating
without precontrol
