STXC2 User’s guide
Version 2.0
3 of 30
If the serial connection to the MMI is not present and the function switch is in position MAN, the
ventilation unit is controlled by the following factory settings on the control circuit board STXC2:
Humidity set point: 60%.
Ambient air volume: 100% (with mixing section).
Fan set point: Maximum air volume.
Temperature set point: 20°C (room temperature control).
The MMI is connected and the function switch is in position MAN, the ventilation unit is controlled
by the manual settings. See chapter 2.5 Setting of manual running mode.
The ventilation unit is controlled in a priority, that defines the operational mode:
1: The function switch on the ventilation unit has the highest priority.
2: Then the communication module STIO controls the operation. See chapter 1.5 Communication
module STIO. The function switch on the ventilation unit is in position AUTO.
3: The MMI STCU controls the operation. See chapter 1.3 MMI STCU description.
By activating the push button Manual the ventilation unit is controlled by the manual settings.
By activating the push button Auto the ventilation unit is controlled by the week program.
The function switch on the ventilation unit is in position AUTO.
1.2 MMI STCU.
The separate STCU MMI is equipped with an alphanumeric display and push buttons, and can be
placed on a wall up to 50m away from the ventilation unit. The wiring must not be fitted outside the
building. The ventilation unit is simple to operate with the MMI and it is with this that the settings
for the running conditions are entered.
The primary settings for the running conditions are entered in a week program.
A six-wire plug connection connects the control circuit board STXC2 to the MMI.
If the function switch on the ventilation unit is in position AUTO the ventilation unit will not run
without the MMI or the communication module STIO connected (See chapter 1.5 Communication
module STIO (Option)).
If the serial connection to the MMI is not present and the function switch is in position MAN, the
ventilation unit is controlled by the following factory settings on the control circuit board STXC2
(See chapter 1.1.1 Function switch).
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