User Manual

Contr
ol concept
Desigo room automation
5
CM110664en_07 103 | 353
Plant operating mode Fan operating mode Heating coil operating mode Cooling coil operating mode
Economy Modulating Two-position Two-position
Protection Modulating Two-position Off
Heat up Modulating Two-position Off
Cool down Modulating Off Two-position
In addition, setpoints and setpoint limits define room and device operating
modes. They can vary depending on the selected HVAC plant operating mode.
Four different setpoints are provided for heating and cooling in the room.
The HVAC control applications in the room dynamically enable and disable the
setpoints to achieve the desired combination of energy-saving Economy and
demand-based Comfort operating mode.
An HVAC control application simultaneously achieves several goals. Functions
with different objects may conflict when they are implemented. In this case, the
command priority determines which command value has priority in the priority
array of the BACnet objects.
HVAC control applications in a room are programmed to accept commands at
many different levels, including operating mode variable level. As a result,
HVAC control applications control the controlled output objects at a priority
commensurate with the active priority of the operating mode variable. The
following figure shows how commands and priorities are passed in the
application.
t
06
:
00
18
:
00
00
:
00
24
:
00
SpC
SpH
Eco
Cmf
Eco
RClmOpMod
C
12345678...141516 13
12345678...141516 13
12345678...141516 13
Fcu01
HclHw01 CclChw01
FanSpd:MO
FcuDevMod01
FcuPltMod01
CclDevModFanDevMod HclDevMod
Close
2Pos
Mod
Close
Mod
Mod
PltOpMod
RClmOpMod
Off
Fire Detector
Off
Eco
Cmf
Close
2Pos
Mod
FanMultiSpd01
HclVlvPos:AO CclVlvPos:AO
TXM1.6R TXM1.8U TXM1.8U
Eco,Cmf
12345678...141516 13
EmgProtMan / Auto
Man / Auto
EmgProtMan / Auto
Command priorities