Stulz Mini-Space DX CCD131A, Original Instructions Manual

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11
/01.2017/ air_MSDX EN
Ecocool
(only for downflow version)
With the Ecocool function outside air is used for cooling the room air and is mixed with the return air via louvers. Two
louvers per unit are installed. At the downflow unit the louvers are situated on top and at the upper part of the rear side.
The louver at the rear allows outside air to come into the unit. Room air flows into the unit through the louver on top
of the downflow unit.
Exhaust air is conducted by another louver which must be provided by the customer to the outside to prevent a
pressure increase in the room by the intake of fresh air.
For description of the control see C7000 manual, Ecocool function.
Actuators and end position switch
Louver actuator NM 24 - SR for fresh or return air
The louver actuator has no end position switch and is overload-proof. When the limit stop of the louver is attained,
the actuator automatically stops.
After switching on the power supply or actuating the push button on the actuator a function test with calibration is
automatically executed. The actuator scans the two end positions and adapts its electrical operating range of 2-10 V
DC and the running time of 150 s to the actual mechanical louver swing angle. The actuator then adjusts itself on
the position which is required by the control signal. The actuators are constantly supplied with 24 V AC. The control
is realized with 0-10 V DC. The actuator NM24-SR is mounted on the fresh air louver.
Function test: By pressing the button at the housing the gear shift is released, and the louver can be
manually operated.
Airflow in free cooling operation
Supply air
Outside air
Room air in DX-
or mix operation