Enable Direct Free Cooling; Maximum Humidity Limit - Mitsubishi Electric Evolution+ s-MEXT Technical Manual

12.4 Enable Direct Free Cooling

Enabling Direct Free Cooling is allowed by the difference between external and room temperatures. In case the difference
between room and external temperature should be higher that a set value, the Free Cooling regulation is enabled.
Freecooling OFF
In the "Free Cooling" menu, accessible through the "Service" password, the operator can set the setpoint and the band for
enabling Free Cooling.
The FC and FC band parameter settings are under the "Free Cooling" menu, which can be accessed by entering the "Service"
password.
For the default values, see the parameters table.

12.5 Maximum humidity limit

If the high humidity limitation function is enabled, the controller behaves according to the following chart.
Freecooling ENABLED
The parameters for this function are under the "Free Cooling" menu, which can be accessed by entering the "Service"
password.
For the default values, see the parameters table.
Version 38
P21.12
Differential
Figure 12-3: Direct Free Cooling enable graph.
P21.16
P21.17
differential
Figure 12-4: high humidity direct Free Cooling limitation graph.
Freecooling ON
T
P21.11
external
Freecooling DISABLED
HR
- T
ambient
(%)
ambient
169