Siemens Climatix S300 HRV - DX Based Cooling (Ccldx21 Y)

5.11.2 DX based cooling (CclDx21y)
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.
Available parameters
Current value BACnetobject R/RW Note
Supply air temperature setpoint for cooling SpTSuCcl
AVAL,224
R °C
Cooling valve position CclDxPos
AO,110 (A1)
AO,119 (A2)
AO,128 (A3)
AO,137 (A4)
AVAL,389 (POS9)
RW %
Cooling DX status CclDxCmd
BO,59 (Q1)
BO,74 (Q2)
BO,89 (Q3)
BVAL,250 (POS9)
RW
Cooling coil DX fault CclDxFlt
BI,113 (X3)
BI,130 (X8)
BI,79 (D1)
BI,96 (D2)
R
Special settings BACnetobject R/RW Note
Cooling Kp GainCclTSuCtrC
AVAL,225
RW % / K
Cooling Tn TnCclTSuCtrC
PINTVAL,112
RW s
DX off time delay CclDxTiOffMin
PINTVAL,116
RW s
DX min run time CclDxTiOnMin
PINTVAL,115
RW s
Testing and debugging BACnetobject R/RW Note
Cooling coil device mode CclDevMod
MVAL,158
1: Off
2: Control Mode
3: Full Open
Application functionalities
Cooling
5
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