Versatile Split Refrigeration Controller AD2-28 Series

Applications

The AD2-28 Series is a versatile solution tailored for a wide range of refrigeration applications, including:

• Upright refrigerators
• Plug-in and supermarket display cases
• Cold stores
• Control panels

This controller is designed to meet the demands of various cooling systems, providing optimal performance and reliability.

Main Features

The AD2-28 Series is packed with innovative features to enhance the efficiency and functionality of your refrigeration systems:

• Cyclic Defrosts: Automatically manages defrost cycles to ensure consistent operation.
• Synchronized Defrost: Start and termination of defrost cycles are synchronized through a master-slave connection, improving system coordination.
• Selectable Input: Choose between NTC10K or PTC inputs based on your specific needs.
• FLEXICOLD Function: Allows for energy-saving operation or switching to an alternative setpoint, optimizing energy consumption.
• Dual Control Option: Offers optional control of a second compressor or evaporator, providing flexibility in system design.
• Evaporator Fan Control: Ensures efficient operation of evaporator fans, contributing to system performance.
• Comprehensive Alarms: Includes absolute or relative temperature alarms, a door open alarm, and a condenser high temperature/pressure alarm for enhanced safety and monitoring.
• Light and Standby Control: Features On/Off control for lights and standby mode, adding to user convenience.
• Supervisory System Connection: Easily connect to LAE supervisory systems for centralized control and monitoring.
• Display Units: Compatible with LCD-5S and RU33 display units for clear and intuitive user interaction.

Each model also comes equipped with an alarm buzzer to promptly alert users of any issues.

Product Variants

The AD2-28 Series includes different variants to suit various application needs:

• AD2-28: The standard model offering comprehensive features.
• AD2-28C1S5E-B: A variant with additional functionalities, including extended input and output options.

Technical Data

General Specifications

The AD2-28 Series is designed to operate effectively across a wide range of conditions:

• Temperature Range: -50…120°C, -55…240°F
• Resolution: 0.1 / 1 °C; °F
• Precision:

• NTC10K: <±0.3°C (-40.0÷70.0°C)

• PTC1000: <±0.5°C (-50÷120°C)

• Sensor Type: Selectable NTC10K (standard model: SN4B20P1/P2/P3) or PTC1000
• Power Supply: 230V~ ±10%, 50÷60Hz, 3W
• Ambient Temperature: -10÷50°C
• Maximum Total Current: 17.5A

Connections and Displays

The AD2-28 Series supports a variety of connections and display options for seamless integration:

• Thermostat
• Door Switch
• Evaporator
• Digital Input (auxiliary DI2)
• Displays: LCD-5S, RU33
• Power Supply:

• 12÷24Vac on screw terminals

• 230Vac

• Serial Port:

• TTL

• RS-485 (for PC communication)

• Defrost Synchronization
• Voltage-Free Connections
• Outputs:

• Evaporator fans

• Defrost

• Auxiliary 1 and 2

Display Units

LCD-5S Display Unit

• Dimensions: 77 x 35 x 20 mm (WxHxD)
• Panel Cut-out: 71 x 29 mm (WxH)
• Front Protection: IP55
• Ambient Temperature: -10÷50°C

RU33 Display Unit

• Dimensions: 169 x 38 x 25 mm (WxHxD)
• Panel Cut-out: 163 x 31.5 mm (WxH)
• Front Protection: IP55
• Ambient Temperature: -10÷50°C

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