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Siemens Switzerland Ltd User Manual CE1U2353en
HVAC Products QAA75.. / QAA78… / AVS37.. 02.06.2009
Occupancy button
If you do not use the rooms for a longer period of time, you can
press the occupancy button to temporarily reduce heating / cooling.
When the rooms are occupied again, press again the occupancy
button.
Heating mode:
Cooling mode:
Heating to Comfort setpoint
Cooling to Comfort setpoint
Heating to Reduced setpoint
Cooling OFF (no symbol)
• The occupancy button is only active in automatic operation
• The current selection is active until the next switching action according to the
timeswitch program takes place
Displaying information
Various data can be displayed by pressing the info button.
0
4 8 12 16 20 24
AUTO
2359Z140
Room temperature
Depending on the type of unit, configuration and operating state, some of the info lines
listed below may not appear.
Display:
− Possible error messages from the error code list on page 51
− Possible service messages from the maintenance code list on page 51
− Possible special mode messages from page 51
Other displays:
− Room temperature − State of heating circuit 1
− Room temperature minimum − State of heating circuit 2
− Room temperature maximum − State heating circuit P
− Outside temperature (OT) − State of DHW
− Outside temp min − State of solar
− Outside temp max − Date and time of day
− DHW temp 1 − Telephone customer service
In exceptional cases, the basic display shows one of the following symbols:
Error messages
If this symbol appears, an error in the
plant has occurred. Press the info button
and read further information.
Text3 Text4
0
4 8 12 16 20 24
AUTO
2359Z140
30:Flow sensor 1
Error
Maintenance or special operation
If this symbol appears, a maintenance
alarm is delivered or the plant has
changed to special mode. Press the info
button and read further information.
Text3 Text4
0
4 8 12 16 20 24
AUTO
2359Z140
30:Flow sensor 1
Error
A list of possible displays is given on page 51.
Possible displays
Exception
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