Features:
- room temperature control
- cascade temperature control
- supply air temperature limitation
- taking the outside temperature into account in the control
- humidity control in the room
- cascade humidity control
- control of the amount of CO2 in the room
- control of pressure differences in ducts
- control of water and/or electric heater
- water or direct evaporation cooler control
- controlling the heat recovery system
- control of the mixing chamber
- thermal protection of fan motors
- antifreeze protection of water heater
- frost protection of recovery
- electric heater protection
- damper control
- monitoring the condition of filters
- fan pressure control
- cooperation with external devices
- calendar function:
- Weekly and yearly clock
- four time zones in a day
- blocking selected functions in a zone
- determine the expenditure for drives with inverters individually for each zone
- change settings for summer/winter
- service features
- function of returning to factory default values
- alarm history (10 most recent alarms)
- MODBUS RTU communication protocol - up to two networks
Digital Inputs:
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motor protection
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2 inputs
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differential pressure switches (filters and fans)
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2 inputs
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heater alarm
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1 input
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cooperation with the fire protection system.
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1 input
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remote control
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1 input
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Universal Inputs:
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- for 0-10V temperature transmitter signal
- and/or measuring the humidity in the room
- and/or moisture measurement in the duct
- and/or external humidity measurement
- and/or a CO2
- and/or a pressure transmitter in the duct2
- and/or measurement of the return water temperature from the heater
- and/or measuring the return water temperature from the cooler
- and/or digital input function for ON/OFF
- and/or AUTO/MANUAL switching
- and/or radiator alarm
- and/or exchanger pressure switch
- and/or filter pressure switch
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2 inputs
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Measurement inputs:
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Temperature sensors PT 1000
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4 inputs
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Digital (relay) outputs:
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fan control
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2 outputs
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control of the heating medium pump
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1 output
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control of dampers actuators
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1 output
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operation signal for external circuits
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1 output
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alarm signal for external systems
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1 output
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cooling demand signal
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1 output
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Analog outputs:
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0-10V signal
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4 (5*) outputs
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Communication port:
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RS 485 protocol MODBUS RTU
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*To ACU L DIN 5 devices controlled by analogue signals can be connected. This is possible because one of the analog outputs, Y2, can control 2 devices (a heater and a cooler). The required condition is that they are not switched on at the same time. The COOL output is used for this, where Y2 is switched between the two terminals of this output for a heating or cooling sequence respectively.