Brine Coil (Prehclbne21Y) - Siemens Climatix S300 HRV Application Manual

5.14.2 Brine Coil (PreHclBne21y)

Available parameters
A6V10733786_en_c
The brine coil includes a pump and a brine flow temperature sensor. The control
depends on the brine flow temperature. A hysteresis of 1 °C (fix) and a minimum
run / pause time of 1 min (fix) for the pump prevent it from switching too frequently.
In case the temperature sensor is not configured, a configurable estimated brine
temperature for summer (cooling) and winter (heating) is used instead.
As the brine flow temperature is not measured correctly, when the pump has
stopped, the last value measured while the pump is running is taken instead.
The preheating coil can also be used for dehumidification, if dehumidification is
requested. Dehumidification is only possible, if the brine flow temperature is below
the dewpoint temperature of the room minus a configurable offset, depending on
the coil design.
Temperature conditions
TOa < TFlPreHcl
TOa > TFlPreHcl
TOa < TFlPreHcl
TOa > TFlPreHcl
TOa > TFlPreHcl and
Dewpoint - Offset > TFlPreHcl
Actual values
Brine pump command
Flow temperature brine
Basic settings
Estimated brine temperature in winter
(TOa < 10°C)
Estimated brine temperature in summer
(TOa > 20°C)
Offset brine flow temperature to
dewpoint temperature
Enable dehumidification via brine
preheater
Testing and debugging
Preheater device mode
Supply air conditions
Heating requested
Heating requested
Cooling requested
Cooling requested
Dehumidification requested. In case of conflicts,
dehumidification request overrules heating or cooling
No dehumidification requested and no heating or cooling
request
BACnet object
PreHclPuCmd
BO,53 (Q1)
BO,68 (Q2)
BO,83 (Q3)
BVAL,244 (POS9)
TFlPreHcl
AI.57 (B3)
AI,63 (B4)
AI,79 (X8)
AVAL,316 (POS9)
AVAL,467 (AI1)
BACnet object
TeaWinEst
AVAL,350
TeaSumEst
AVAL,351
SpTBneDhu
AL,454
EnPrhDhuCnf
BVAL,314
BACnet object
PreHclDevMod
MVAL,406
Application functionalities
Preheating Functions
Pump
command
On
Off
Off
On
On
Off
R/RW Note
RW
RW
R/RW Note
RW
RW
RW
RW 0: No dehumidification
1: Dehumidification
released, if required
R/RW Note
1: Off
2: Control mode
3: Fully open
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