Technical Overview

• Model: EWPlus 974 (Code: EW2EDL0XC4B01)
• Application: Electronic controller for ventilated refrigeration units
• Mounting: Panel mount (71×29 mm cutout)
• Display: LED with multiple status indicators (compressor, defrost, fan, alarm, °C/°F)

 Functional Features

• Control Outputs:
  • Compressor
  • Defrost
  • Fan
  • Auxiliary output (model-dependent)
• Operating Modes:
  • COOL and HEAT (requires reprogramming via Copy Card)
• Alarms:
  • Visual indicators for probe faults (e.g., Pb2 malfunction shows E2)
  • Audible alerts via integrated buzzer

 Programming & Connectivity

• Menus:
  • Machine Status: Quick access via SET key
  • Programming: Accessed by holding SET for 5 seconds
• Copy Card Support:
  • Upload/download parameter maps
  • Fast cloning across devices
• Serial Port: TTL for remote programming and diagnostics

 Sensor & Control Logic

• Probe Inputs: Supports multiple temperature probes
• Logic Control: Includes delay, protection, and blocked start-up logic for compressor and defrost cycles