Siemens Climatix S300 HRV - Page 110

Available parameters
Actual values BACnetobject R/RW Note
Heat exchanger condensation monitoring HExgCdnMon
BI,75 (D1)
BI,92 (D2)
BI,109 (X3)
BI,126 (X8)
R
Basic settings for efficiency alarm BACnetobject R/RW Note
Min difference between extract and outside air
temperature
DiffTExTOaMin
AVAL,382
RW K
Min difference between extract and exhaust
temperature
TDHExgTErr
AVAL,381
RW K
Efficiency supervision delay time TiDlyHExgTErr
PINTVAL,149
RW sec.
ERC efficiency calculation
TOa Outside air [°C] TEh Exhaust air temperature [°C]
TEx Extract air temperature [°C] TSuAfPreHcl Supply temperature after preheating coil [°C]
TSuAfHexg Supply temperature after heat exchanger [°C]
Exhaust side
Efficiency n is calculated on the exhaust side by the following formula:
n = (TEx – TEh) / (TEx – TOa)
In case the preheating coil is active, TSuAfPreHcl is used instead of TOa. If the
sensor is not available while the preheating coil is active, the efficiency is
unreliable.
Supply side
If an additional supply air sensor after the heat exchanger is available, the
efficiency n is calculated on supply and exhaust side as:
n = 0.5 * (TEx – TEh) / (TEx – TOa) + 0.5 * (TSuAfHexg – TOa) / (TEx – TOa)
Efficiency calculation requires at least outside temperature, extract temperature
and exhaust temperature sensors.
Available parameters
Current values BACnetobject R/RW Note
ERC efficiency PrHExgEfcy
AVAL,372
R %
Application functionalities
Energy Recovery
5
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