Assortment / System Description

Radiant/chilled ceiling application
2-pipe heated/chilled ceiling with changeover system
15
A6V10866237_en--_b_08 71 | 275
15.2 2-pipe heated/chilled ceiling with changeover
system
Figure: Example for a heating/chilled ceiling application 2-pipe system
Key:
DXR2… Room automation station R1 Room operator unit
Rcg Heated/chilled ceiling valve D1 Presence
CdnMon Condensation monitor D2 Window contact
Y Output signal TR Room temperature
SpH Effective heating setpoint SpC Effective cooling setpoint
YH Heating valve YC Cooling valve
Chovr Changeover system
Figure: Modulating heating and cooling sequence with changeover system
The central function for chilled water supply determines whether the water
system is used for heating or cooling based on heating/cooling demand of
individual rooms in this supply group. The evaluated result is send via grouping
to the room segment to enable the heating or cooling sequence in the room.
The changeover determination logic counts each the segments with heating or
cooling demand.
The cooling controller is disabled during heating and the heating controller
during cooling.
Plant diagram
Sequences
Changeover system