Weather-Compensated Setpoint For Boiler Sequencing; Heat Demand Transformers - Siemens Synco 700 Series Basic Documentation

Notes
Example
Building Technologies
HVAC Products
Direct delivery is described in chapter 6 "Boiler sequence management" and delivery
via the primary controller in chapter 9 "Precontrol".
The special case of weather-dependent setpoint compensation for boiler sequencing is
described in the following section.
8.2 Weather-compensated setpoint for boiler
sequencing
There may be a need to operate the boiler sequence according to a weather-
compensated setpoint without having a heating circuit. This can be the case if, for
example, a great effort would be required to integrate existing consumer circuits into the
new system.
In this case, a virtual heating circuit can be used.
This virtual heating circuit predefines a weather-compensated flow temperature setpoint
for the boiler sequence manager, including all choices offered by function block "Heat-
ing circuit".
It is thus possible to use the time program, for example, or the digital input for change-
over of the heating circuit mode to switch between no heat request and weather-
compensated heat request.
If the digital input for the room operating mode is used, it is possible to select the
operating mode employed when the contact is active.
If, with the active operating mode, Comfort mode shall apply, room operating mode
Protection must be selected for the heating circuit. This ensures that, depending on the
contact position, heat demand for the boiler sequence is switched between the
weather-compensated flow temperature setpoint for Comfort mode and Protection.
To activate the virtual heating circuit, the "Heating circuit" setting in the extra configura-
tion must be parameterized to "Active". In addition, the outside temperature is required.
This can be configured in function block "Miscellaneous". The outside temperature can
also be acquired via KNX bus. For more detailed information, refer to subsection 14.5.2
"Outside temperature".
Main menu > Commissioning > Extra configuration > Heating circuit
Operating line
Virtual heating circuit
T T
1
2
T
T
8.3

Heat demand transformers

Heat demand transformers are available with both the main header and the primary
controller. They receive and handle the requests from:
• The individual room radiators (RXB..., RXL...)
• The individual room air heating coils (RXB..., RXL...)
• Air handling plant (RMU..., RMS...)
Boiler sequence controller RMK770
8 Heat demand and heat requests
Range
Active / Inactive
TFl
T
T
Factory setting
Inactive
TO
On / Off
TOeff
135/232
CE1P3132en
23.04.2009