Maximum Humidity Limit; Direct Free Cooling Operation During Cold Resource Alarm; Direct Free Cooling Status Display Mask - Mitsubishi Electric s-MEXT-G00 006 Technical Manual

TM_s-MEXT_ME28relC_00_12_19_EN
In the "Free Cooling" menu, accessible using 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.
11.5

MAXIMUM HUMIDITY LIMIT

If the high humidity limitation function is enabled, the controller behaves according to the following chart.
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.
11.6

DIRECT FREE COOLING OPERATION DURING COLD RESOURCE ALARM

With Direct Free Cooling enabled, it is possible to select whether or not to enable Free Cooling operation when a cold resource alarm appears (compressor or water flow
alarm). In particular, the parameter can be used to select compressor alarm setpoint and band in case of direct expansion resource, or water flow (no water) alarm condition
for water-cooled units.
The setpoint and adjustment band values for all the types of units are in the "Freecooling" menu, which can be accessed by entering the "Service" password. For the
default values, see the parameters table.
11.7

DIRECT FREE COOLING STATUS DISPLAY MASK

Free Cooling status can be viewed at any time. From the main mask, by pressing the [DOWN] key, the operator opens the following mask.
The centre image offers a graphic representation of the Free Cooling damper position.
The following values are also reported
•
External air temperature (left of the image).
•
External air temperature (right of the image).
•
Temperature difference (centre, above the image).
•
Free Cooling status (enabled or disabled).
•
Damper position (internal only, mixing, external only) and the opening percentage.
Technical manual
Freecooling ON
P21.16
Figure 11-5: Freecooling high humidity limitation chart
T.INT
24.0
Status
Position ALL INTERNAL
P21.17
Differential
DT 03.0
T.EXT
21.0
Enabled
000%
Damper in internal air only position
Damper in mixing position
indoor and outdoor air.
Damper in external air only position.
92
Freecooling OFF
RH (%)
ambient
TRANSLATION OF THE ORIGINAL INSTRUCTIONS