Temperature Adjustment In Units With Direct Freecooling; S-Mext Unit Regulation With Direct Free Cooling - Mitsubishi Electric Evolution+ s-MEXT Technical Manual

12.3 Temperature adjustment in units with Direct Freecooling

INFORMATION:
Parameter P21.21 is set as follows, depending on the type of unit:
•
P21.21 = 33% if the unit has two connected Mr. Slim units.
•
P21.21 = 50% if the unit only has one connected Mr. Slim unit.
The parameter can in any case be set using the "Free Cooling" menu, which can be accessed by entering
the "Service" password.
The temperature adjustment charts are modified as shown in the following paragraphs.
12.3.1

S-MEXT unit regulation with Direct Free Cooling

Figure 12-2: resource activation chart for Split Type unit with 1 Mr Slim and Free Cooling damper.
Figure 12-3: resource activation chart for Split Type unit with 2 Mr Slim and Free Cooling damper.
Version 38
P21.14
P21.13
Step no. 11
Step no. 0
P21.21
P50.01
P20.18 differential
P21.14
P21.13
Step no. 11
Step no. 0
P21.21
P50.01
Differential P20.18
Free Cooling
damper
PAC-IF Client
request
T (°C)
ambient
Free Cooling
damper
PAC-IF Client
request
T (°C)
ambient
168