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Preselection
State
Cause
Overriding the
24-hour program
Room unit QAW740
Conventional switches
and buttons
Room operating mode
contact
Timer function
Settings
156/226
Building Technologies
HVAC Products
* Frost protection is ensured
The heating circuit can be switched off for service purposes. On completion of pump
overrun, the mixing valve will close and the heating circuit pump will be switched off.
When preselecting "Off", the internal frost protection function remains active.
After completion of service work, the selector must be set back to
The heating circuit's present state (On / Off) is displayed.
It is indicated why the current state is active.
10.5.4 User requirements in the room
In
mode, the user can override the current 24-hour program and change to
some other setpoint.
Following can be used for operation from the room:
• Switch or button (directly connected)
• Konnex operator devices (e.g. QAW740).
If room operating mode holidays is set to Protection
functions cannot be activated during the holiday period.
Using the QAW740 room unit, the plant operator can select the room operating mode
via the Mode button or Timer button.
Messages from external switches or buttons can be read in via inputs. They override
the other control interventions in accordance with the control priority.
The required inputs must be configured in the extra configuration.
Using this contact, it is possible to switch to a room operating mode setpoint. This room
operating mode is maintained as long as the contact is active.
The room operating mode can be selected on the service level.
By pressing the button, Comfort mode can be selected for a certain period of time via
this contact. The duration is fixed; the preselection can be adjusted on the service level.
The following settings define the mode of operation of the room operating mode contact
and of the button for the timer function.
Main menu > Settings > Heating circuit > Space heating
Operating line
Preselected room optg mode
Timer function*
* This setting also applies to the timer function via third-party Konnex devices
Boiler Sequence Controller RMK770
10 Heating circuit control
User requisition external /
Overtemp protec-
tion/overrun /
Plant operation selector /
No requisition /
Frost protection for the
flow /
Frost protection for the
plant
, presence buttons and timer
Range
Comfort / Precomfort /
Economy / Protection
0...720 min
.
Factory setting
Comfort
60 min
CE1P3132en
01.03.2005
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