Siemens Synco 700 Series - User Requests from the Room; Room Operating Mode Contact

154/232
Building Technologies Boiler Sequence Controller RMK770 CE1P3132en
HVAC Products 10 Heating circuit control 23.04.2009
10.3.2 User requests from the room
The user is given a number of choices to override the current 24-hour program and to
change the setpoint. Following can be used to override operation from the room:
• Switches or buttons (directly connected)
• KNX operator units (e.g. QAW740)
• Bus operator unit RMZ792
The QAW740 room unit enables the user to select the room operating mode via the
Mode or timer button.
User interventions can also be made via third-party devices having a KNX interface (S-
mode). Prerequisite is that the room operating mode is preset to
.
In
mode, the presence button can be used to change the room operating mode
for the period of time to the next switching point of the time switch. The change is made
between Comfort or Precomfort and Economy mode.
The timer function is identical with the timer function triggered via a conventional button.
For this reason, the same setting is used for that period of time. For a description of this
function, refer to subsection 10.3.4 “Timer function“.
The inputs for the room operating mode and the timer function can be used to connect
external switches or buttons for overriding the room operating mode. The next 2 sub-
sections describe the manner of operation of these inputs.
The inputs override the other control interventions according to the control priorities.
A description of the control priorities is given in subsection 10.3.7 “Control priorities in the
heating circuit“.
10.3.3 Room operating mode contact
Using a configurable input, a contact signal for changeover of the room operating mode
can be acquired. Changeover takes place between the currently active operating mode
and a selectable fixed operating mode.
The input is activated via the extra configuration:
Main menu > Commissioning > Extra configuration > Heating circuit > Inputs > Room operating
mode
Assign terminal
Main menu > Commissioning > Settings > … or
Main menu > Settings > Heating circuit > Space heating
Operating line Range Factory setting
Preselected room optg mode Comfort / Precomfort /
Economy / Protection
Comfort
Heat limit with Comfort preset Inactive / Active Inactive
If Comfort mode is preselected via the room operating mode contact, the heating limit
can be activated via these settings.
If Comfort mode is active in accordance with the time program, the heating limit always
takes effect, irrespective of this setting.
Overriding the
24-hour program
Room unit QAW740
Third-party devices
with KNX interface
Presence button
Timer function
Conventional switches
and buttons
Extra configuration
Settings
Heating limit with preset
Comfort mode