5.11 Cooling
Additional cooling is used when the ERC is not available for cooling, is locked for
cooling, or is available for cooling but has reached its maximum position. To
release cooling, the supply air temperature must rise above the setpoint plus the
cooling difference.
With free cooling, the room can be cooled without energy consumption.
If possible, cooling is supported by a brine winding or a ground collector.
5.11.1 Cooling coil chilled water (CclChw21y)
If ERC cannot maintain the supply air temperature setpoint, chilled water cooling
coil can be activated and controlled as second cooling sequence.
After activation, the cooling coil pump is activated and the cooling coil valve is
controlled so that the supply air temperature is kept at the setpoint. The pump runs
depending on the valve position (fixed switch-on point 5 %).
Available parameters
Current value
BACnet object
R/RW
Note
Setpoint supply air temp. cooling for cooling coil
SpTSuCcl
AVAL,222
R
°C
Cooling valve position
Prio2: Fire / Smoke
Prio5: Protection from plant control
CclVlvPos
AO,109 (A1)
AO,118 (A2)
AO,127 (A3)
AO,136 (A4)
AVAL,388 (POS9)
AVAL,477 (AO1)
AVAL,484 (AO2)
RW
%
Cooling pump command
Prio2: Fire / Smoke
Prio5: Protection from plant control
CclPuCmd
BO,58 (Q1)
BO,73 (Q2)
BO,88 (Q3)
BVAL,249 (POS9)
RW
Special settings:
BACnet object
R/RW
Note
Cooling Kp
GainCclTSuCtrC
AVAL,223
RW
% / K
Cooling Tn
TnCclTSuCtrC
PINTVAL,111
RW
s
Testing and debugging
BACnet object
R/RW
Note
Cooling coil device mode
Prio2: Fire / Smoke
Prio4: Overtemperature protection
Prio5: Protection from plant control
CclDevMod
MVAL,156
1: Off
2: Control Mode
3: Full Open
Application functionalities
Cooling
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