Dx Based Cooling (Ccldx21Y) - Siemens Climatix S300 HRV Application Manual

Application functionalities
5
Cooling

5.11.2 DX based cooling (CclDx21y)

Available parameters
116 | 170
If ERC cannot maintain the supply air temperature setpoint, direct expansion
cooling coil can be activated and controlled as second cooling sequence.
Activation and operation of DX cooling differs from water based cooling so that
cooling valve request must first rise above 10 % (fix) before activation command to
DX unit is given. DX activation command is also removed at 5 % (fix) valve position
before the valve is completely closed. New activation command can be given
earliest after set off-time has elapsed.
Current value
Supply air temperature setpoint for cooling
Cooling valve position
Cooling DX status
Cooling coil DX fault
Special settings
Cooling Kp
Cooling Tn
DX off time delay
DX min run time
Testing and debugging
Cooling coil device mode
BACnet object
SpTSuCcl
AVAL,224
CclDxPos
AO,110 (A1)
AO,119 (A2)
AO,128 (A3)
AO,137 (A4)
AVAL,389 (POS9)
CclDxCmd
BO,59 (Q1)
BO,74 (Q2)
BO,89 (Q3)
BVAL,250 (POS9)
CclDxFlt
BI,113 (X3)
BI,130 (X8)
BI,79 (D1)
BI,96 (D2)
BACnet object
GainCclTSuCtrC
AVAL,225
TnCclTSuCtrC
PINTVAL,112
CclDxTiOffMin
PINTVAL,116
CclDxTiOnMin
PINTVAL,115
BACnet object R/RW
CclDevMod
MVAL,158
A6V10733786_en_c
R/RW Note
R °C
RW %
RW
R
R/RW Note
RW % / K
RW s
RW s
RW s
Note
1: Off
2: Control Mode
3: Full Open