Siemens Climatix S300 HRV Application Manual page 110

Application functionalities
5
Energy Recovery
Available parameters
TOa Outside air [°C]
TEx Extract air temperature [°C]
TSuAfHexg Supply temperature after heat exchanger [°C]
Exhaust side
Supply side
Available parameters
110 | 170
Actual values
Heat exchanger condensation monitoring
Basic settings for efficiency alarm
Min difference between extract and outside air
temperature
Min difference between extract and exhaust
temperature
Efficiency supervision delay time
ERC efficiency calculation
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.
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.
Current values
ERC efficiency
BACnet object
HExgCdnMon
BI,75 (D1)
BI,92 (D2)
BI,109 (X3)
BI,126 (X8)
BACnet object
DiffTExTOaMin
AVAL,382
TDHExgTErr
AVAL,381
TiDlyHExgTErr
PINTVAL,149
TEh Exhaust air temperature [°C]
TSuAfPreHcl Supply temperature after preheating coil [°C]
BACnet object
PrHExgEfcy
AVAL,372
R/RW Note
R
R/RW Note
RW K
RW K
RW sec.
R/RW Note
R %
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