Danfoss pack controller AK-PC 781A w. WRG function 080Z0191
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Description
Rack controller AK-PC 781A with heat recovery function (24 V AC). The AK-PC 781A is a complete control unit for regulating the performance of compressors and condensers in refrigeration and air conditioning systems. The controller features oil control, heat recovery functions and CO2 gas ...
Rack controller AK-PC 781A with heat recovery function (24 V AC). The AK-PC 781A is a complete control unit for regulating the performance of compressors and condensers in refrigeration and air conditioning systems. The controller features oil control, heat recovery functions and CO2 gas pressure regulation. Controllers can also send signals for informing other controllers about operating status, e.g. forced closure of expansion valves, alarm signals and alarm messages. The primary function of the controller is to ensure that compressor and condensers are always operating under optimal pressure conditions for best energy efficiency. Both the intake pressure and the condensing pressure are controlled via voltage signals sent out by pressure transducers. Performance control can be achieved via intake pressure P0, medium temperature S4 or using a separate control pressure Pctrl (in cascades).
Features
• Control performance of up to 10 compressors
• Up to 3 relief valves per compressor
• Oil management. Joint or individual control of all compressor oil valves. Collector pressure regulation.
• Speed control for 1 or 2 compressors
• Up to 6 safety inputs per compressor
• Option to ...
• Control performance of up to 10 compressors
• Up to 3 relief valves per compressor
• Oil management. Joint or individual control of all compressor oil valves. Collector pressure regulation.
• Speed control for 1 or 2 compressors
• Up to 6 safety inputs per compressor
• Option to limit performance in order to minimise consumption spikes
• If compressors cannot be started, other controllers can be informed of this and electrical expansion valves closed.
• Regulation of fluid injection into the intake line
• Start/stop fluid injection in the heat exchanger (cascade)
• MT/LT coordination between controllers in cascades
• Safety monitoring for high pressure / low pressure / pressure pipe temp.
• Performance control of up to 8 fans
• Floating target value based on external temperature
• Heat recovery function
• CO2 gas cooler and collector regulation
• Parallel compressors in transcritical CO2 systems
• Selective operation, speed regulation or combination
• Safety monitoring of fans
• Status of inputs and outputs indicated by LEDs on the front of the device.
• Alarm signals can be generated by data communication.
• Alarms with text display so that the meaning of the alarm is clear.
• Other functions that are totally separate from regulation features – these include alarm, thermostat and pressure switches and a
PI regulation function.
Accessories / Replacement parts
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Connection cable
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Console
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Display
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Pressure transmitter
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Probe / sensor