Electronic controllers for centralised air-conditioning units

Eliwell, a leading manufacturer for over a decade of control equipment for small and medium-size air conditioning units is proud to present Energy ST, the new range of compact devices with

advanced functions and innovative applications for the HVAC market.

Single-circuit control of centralised air-conditioning systems with 1 or 2 compressors (steps), such as:

•  Chillers, Heat Pumps, Close Control:
• water-air;
• air-water;
• water-water;
• air-air;
• Motorised condensers
• air-cooled;
• water-cooled.

 Typical applications:

• Minimarkets
• Industrial plants
• Offices
• Hotels
• Residential buildings.

Technical data:

There are 6 models in the Energy ST 500 range providing up to 5 relay outputs, one TRIAC output, 2 PWM/Open Collector analogue outputs and a 0…10V/4…20mA analogue output that can be

configured and an Open Collector digital output for external relays. All inputs and outputs are independent and configurable, meaning they can be adapted to fit any system.Eliwell’s standard 32x74mm format also ensures the utmost flexibility and ease of installation.

Main functions:

• Temperature control via the input or output probe.
• Integrated boiler or heating control.
• Integrated control of two electrical heaters or heating system.
•  Dynamic setpoint.
• Automatic change-over.
• Indoor ventilation control.
• Dynamic defrosting.
• Full diagnostics.
• Modulating water pump control.
• Adaptive function for units with no accumulation.
• Antifreeze function with water pump on external probe.
• Control of non-uniform tandem compressors.
• Power limitation.
• Resources optimized in relation to external temperature.