AS3020

Summary

Product identification

The unit type AS3020 is a universal controller for automatic monitoring and control of cooling tower plants.

Features

User Interface

• Monochrome LCD display (16x2 characters)
• Control through three internal keys
• Supports English, French, German, and Dutch languages

Inputs

• 3x Input for potential-free switch
• 1x Conductivity meter

Conductivity meter

• Automatic range switching
• Supports cell constants from 0.01 to 10.00 cm⁻¹
• Range from 0.5 to 100,000 µS/cm (depending on the cell used)
• Manual temperature compensation
• Utilizes a capacitive cell

Outputs

• 3x Relay output (powered)

Memory

• Programming is stored in non-volatile memory and is not affected by power loss.

Enclosure

• Suitable for wall mounting
• IP65 rated

Power supply

The unit accepts the following power supply inputs and provides a corresponding output:

• 24 VAC input / 24 VAC output
• 115 VAC input / 115 VAC output
• 230 VAC input / 230 VAC output
• 12 VDC input / 12 VDC output
• 24 VDC input / 24 VDC output

Function Table

The relay outputs and digital inputs are related to the following functions:

Relay Outputs

• Inlet valve
• Flush valve
• Alarm

Digital Inputs

• Alarm reset
• High level switch
• Low level switch

Ordering Information

The AS3020 controller is ordered with a specified power supply:

• AS3020 controller with power supply:
  • 24V: 24 VAC / 24 VAC
  • 115V: 115 VAC / 115 VAC
  • 230V: 230 VAC / 230 VAC
  • 12VDC: 12 VDC / 12 VDC
  • 24VDC: 24 VDC / 24 VDC

Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror