Operation
Free cooling operation
Free cooling is controlled by Reliatel ECA
board. When free cooling is enabled, mix
return air damper will close and energy
recovery heat exchanger will be deactivated.
The ERM will operate as a 100% fresh air /
100% exhaust air unit.
Set the EXF set point at 50% on the RTOM
– R40 inside the control panel of the unit.
Figure 11 -
Exhaust fan setup
In case of dual exhaust fan, set up both
exhaust fan inverters at the same reference.
Adjust the minimum speed (x% fresh
airflow) via frequency drive parameter 204.
(See Fan performances tables in Appendix)
Adjust the maximum speed (100% airflow
exhausted) via frequency drive parameter
205. (See Fan performances tables in
Appendix).
Fresh air percentage can be controlled
measuring return air, outdoor air and mix air
temperature with the following formula:
T°return - T°mix
T°return - T°outdoor
Min% =
Stating:
Min % = % fresh air
T°return = Return air temperature
T°Outdoor = Outdoor air temperature
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