5.9.2.2 ERC supervision (passive, controlled)
A mechanical failure on the ERC (e.g. bypass damper blocked, heat exchanger
dirty etc.) can be detected via the efficiency of the heat exchanger. Therefore, the
temperature difference between extract air / room air and exhaust air is used.
When the difference drops below set value and stays below during set delay time,
alarm is generated.
The detection function is only active if the temperature difference between fresh air
and extract air exceeds the set limit value and the actual position of the bypass
damper is more than 95 % (fixed).
Extraction or room temperature sensor and exhaust gas temperature sensor are
mandatory for efficiency monitoring.
If the exhaust air temperature and the exhaust air temperature are not available,
monitoring of the ERC is not possible.
The error message of the condenser pump can be configured for the unit.
The pump itself operates autonomously and does not require its own logic. The
resulting error message must be connected to a digital, potential-free input on the
controller. When an error message is received, the bypass damper is closed.
The alarm class of these alarms can be configured as A-alarm, B-alarm or none.
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
off/on
Basic settings for efficiency alarm
BACnet object
R/RW
Note
Min difference between extract and outside air temperature
DiffTExTOaMin
AVAL,362
RW
K
Min difference between extract and exhaust temperature
TDHExgTErr
AVAL,361
RW
K
Efficiency supervision delay time
TiDlyHExgTErr
PINTVAL,139
RW
sec.
Application functionalities
Energy Recovery
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