5.9.1.2 ERC supervision (rotational)
A mechanical failure on the ERC (e.g. belt broken, wheel stuck, heat exchanger
dirty etc) can be detected via the efficiency of the heat exchanger. For this, the
temperature difference between extract air / room air and exhaust air is used. If the
difference drops below set value and stays below during set delay time, an alarm is
triggered.
The detection function is only active if the temperature difference between outside
air and extract air exceeds the set limit value and the actual ERC control signal is
more than 95 % (fixed) of the set maximum speed. An electrical failure of the ERC
can be detected via BI signal.
Extract or room temperature sensor and exhaust temperature sensor are
mandatory for efficiency supervision
When extract air temperature and exhaust air temperature or the fault signal are
not available, the supervision of the ERC is not possible. 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 fault
RotHExgFlt
BI,76 (D1)
BI,93 (D2)
BI,110 (X3)
BI,127 (X8)
R
Basic settings for efficiency alarm
BACnet object
R/RW
Note
Min difference between extract and outside air
temperature
DiffTExTOaMin
AVAL,169
RW
K
Min difference between extract and exhaust
temperature
TDHExgTErr
AVAL,168
RW
K
Belt broken delay time
TiDlyHExgTErr
PINTVAL,84
RW
sec.
Application functionalities
Energy Recovery
5
96 | 170
A6V10733786_en_c