TM_s-MEXT_ME28relC_00_12_19_EN
Technical manual
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
90
11
DAMPER MANAGEMENT
11.1
DELIVERY DAMPER
There is a delay before the fan is started, to allow for the delivery damper to open. This involves use of the auxiliary damper contact. As soon as the damper is almost
completely open, the fan is cleared for start-up.
For further details, please refer to the electrical diagrams.
The parameter for configuring the damper presence is under the
“Optional” menu
, which can be accessed by entering the
“Service” password
.
Moreover, once the damper is enabled, a delay is inserted in order to allow the air flow alarm to be detected. This delay is set according to the contents of the datasheet of
the damper motor.
The parameter for configuring the damper opening time is under the
“Optional” menu
, which can be accessed by entering the
“Service” password
.
For the default values, see the parameters table.
11.2
DIRECT FREE COOLING DAMPER
The Direct Freecooling damper is available for all unit types, with the exception of units with Indirect Freecooling.
It remains shut if:
•
The fan is off (unit OFF).
•
Direct Freecooling is not enabled.
•
The compressor or the valve are active and temporary operation is not enabled.
In all the other cases, the opening is defined by the following adjustment charts, showing the modulating (analogue, on the left) and on/off (digital, on the right) adjustments.
Damper aperture
%
P21.13
P21.14
T
ambient
(°C)
Damper differential
P50.01
Damper aperture
%
T
ambient
(°C)
P50.01
Damper differential
P21.13
P21.14
Figure 11-1:
Free Cooling damper adjustment chart
Damper modulation, if enabled, is integral proportional.
The parameter for the selection of the type of damper adjustment (P20.10) can be found under the
“Freecooling” menu
, which can be accessed by entering the
“Service”
password
.
