TM_s-MEXT_ME28relC_00_12_19_EN
Technical manual
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
91
11.3
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 “Freecooling” menu, which can be accessed by entering the “Service” password.
The temperature adjustment charts are modified as shown in the following paragraphs.
The parameters for configuring the Freecooling function are in the
“Freecooling” menu
, which can be accessed by entering the
“Service” password
.
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.
11.3.1
Adjustment of Split Type units and Direct Freecooling with damper
P21.13
P21.14
ambient
T
(°C)
P20.18 differential
Master PAC-IF
card request
P50.01
Freecooling
damper
50%
Step no. 0
Step no. 11
Figure 11-2:
Resource activation chart for Split Type unit with 1 Mr Slim and Freecooling damper
T
ambient
(°C)
P20.18 differential
P50.01
P21.13
P21.14
Freecooling
damper
P21.21
Master PAC-IF
card request
Step no. 11
Step no. 0
Figure 11-3:
Resource activation chart for Split Type unit with 2 Mr Slim and Freecooling damper
11.4
ENABLING 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.
T
external
- T
ambient
P21.12
Differential
Freecooling ON
P21.11
Freecooling OFF
Figure 11-4:
Free cooling use enable chart
