Eliwell Sb655 C Manual May 2026

Eliwell SB655C User Manual

1. Introduction

The Eliwell SB655C is a microprocessor-based digital controller designed for temperature control in medium/low temperature refrigeration units, cold rooms, and HVAC systems. It features a dual display (setpoint/actual temperature), relay outputs for compressor and defrost, and configurable parameters.

• Power Supply: 230V AC (standard model)
• Display: 3-digit red LED, plus icons for °C/°F, compressor status, defrost, and alarm.
• Inputs: Up to 2 NTC (Negative Temperature Coefficient) probes (Probe 1 for ambient/product temp; Probe 2 for evaporator temp).
• Outputs: Relay for compressor (16A resistive), relay for defrost (heater or hot gas), and optional alarm relay.
• Defrost Management: Natural (off-cycle) or electrical (heater) defrost with drip time settings.
• Protection: IP65 front panel (splash-proof).

• Temperature control: The Eliwell SB655 C offers precise temperature control, allowing you to set and maintain the desired temperature with ease.
• Digital display: The device features a clear and intuitive digital display, making it easy to monitor and adjust settings.
• Configurable inputs and outputs: The Eliwell SB655 C offers a range of configurable inputs and outputs, allowing you to tailor the device to your specific needs.
• Communication protocols: The device supports various communication protocols, including Modbus and BACnet, enabling seamless integration with other systems.

9. Ordering Codes & Accessories

| Model | Description | |-------|-------------| | SB655C | 230Vac, PTC/NTC, 2 relays | | SB655C 12V | 12Vac/dc version | | NP010 | NTC probe (103AT-2, 3m cable) | | PP010 | PTC probe (3m cable) | | FPL200 | Panel gasket for IP65 | eliwell sb655 c manual

4. Front Panel & Operation

4.1 Display & Keys

| Key | Function (Short press) | Function (Long press, 3s) | |-----|------------------------|----------------------------| | SET | View/Modify setpoint | Enter parameter menu | | DEF | Manual defrost | --- | | UP | Increase value / browse | --- | | DOWN | Decrease value / browse | --- | | ON/OFF | Standby (display off) | --- | Eliwell SB655C User Manual 1

Hour Balancing: Ensures balanced operating hours for compressors, even those with different power capacities. User Interface and Programming Power Supply: 230V AC (standard model) Display: 3-digit

Are you seeing a specific error code on your display that wasn't covered here?

3.1 Reading and Changing the Set Point (Target Temperature)

1. Press and release the SET key.
2. The display will show the current set point (e.g., 3.0 for 3°C).
3. Use UP or DOWN to change the value.
4. Press SET again to save. The display will flash to confirm.

How to extract settings from a dying unit: