Before powering the unit, correct wiring is essential. The SB655C is versatile, but incorrect wiring can damage the relays or the compressor.
Eliwell is now part of Schneider Electric. The best version of the manual is the official PDF hosted on their server. Search for the "Eliwell SB655 Series Installation and User Manual" (p/n: 930000001840). Look for the revision date; newer revisions include updated parameter maps.
| Problem | Likely Cause (from manual) | Parameter to check | |---------|----------------------------|--------------------| | Display shows EE | Probe faulty or not connected | P2P = 0 (no probe?) → set to 1 | | Defrost doesn’t start | Defrost interval too long or probe error | d0 (interval), d1 (duration) | | Compressor doesn’t stop | Differential (r0) too wide or stuck relay | r0 = 2.0 °C default | | Wrong temperature reading | Wrong probe type (NTC vs PTC) | c0 = 0 (NTC) / 1 (PTC) |
The Eliwell SB655 C is a powerful controller, but it is notoriously unfriendly to new users. By using this guide as your "best manual" companion, you can stop the alarm beeping, set the correct defrost schedule, and save hundreds of dollars in spoiled food or service calls.
Save this article, download the official PDF from Schneider, and print the parameter table. You now have everything you need to master the Eliwell SB655 C.
Need specific help? Leave a comment below with your error code or parameter question.
The Eliwell SB655/C (often referred to as the SB655 C/S) is a universal HVAC controller from the Energy Flex series designed for managing air conditioning systems with up to two circuits. Key Technical Specifications
The Eliwell SB655/C is built for versatility in centralized cooling and heating:
Circuit Management: Supports up to 2 circuits and 4 power steps.
Compressor Support: Compatible with Scroll, Semi-Hermetic, and Screw compressors.
Inputs/Outputs: Equipped with 5 sensors (NTC/4-20 mA/0-10 V), 6 relays, and 6 digital inputs.
Connectivity: Native support for Modbus and Televis protocols. eliwell sb655 c manual best
Clock: The "/C" designation typically indicates a model with a built-in Real Time Clock (RTC). Advanced Operational Features
The controller is praised for its "intelligent" management capabilities:
Adaptive Cooling: Features an adaptive function for cooling systems without a battery or storage tank.
Energy Efficiency: Includes frequency inverter control for compressors and primary water pumps to optimize performance.
Automatic Changeover: Manages automatic summer/winter operation switches based on demand.
Smart Defrost: Uses advanced algorithms for dynamic defrost and condensation control to reduce energy consumption. Quick Setup & Troubleshooting
Based on user manuals from Eliwell and Micro Matic, here are standard programming steps: Action Access Main Menu
Press and hold the SET button for more than 5 seconds until "PA2" appears. Enter Password
The standard security code is 22. Use the arrow keys to enter it, then press SET. Manual Reset
Alarms can often be reset by holding the UP + DOWN keys simultaneously. "OFF" Display
If the screen shows "OFF," you may need to enter the parameters (Folder Ui23) and change the value from 0 to 1 to enable button activation. Common Alarm Codes Before powering the unit, correct wiring is essential
If your unit is displaying an error, refer to these common codes found in the Eliwell Technical Support Bulletin:
Electronic controllers for centralised air-conditioning units
The Eliwell SB655/C is a sophisticated electronic controller designed for ventilated refrigeration units. It belongs to the SmartBridge series, known for its modularity and integration capabilities. Finding a "deep" manual usually involves understanding its logic for temperature control, defrosting, and energy management. Core Functionality
The SB655/C is a microprocessor-based controller. It manages temperature by cycling the compressor based on sensor readings. It is specifically built for units with fans (ventilated), allowing for precise airflow control. Key Technical Specifications Power Supply: Usually 230V AC or 115V AC. Supports NTC or PTC thermistor probes. Multiple relays for compressor, defrost, and fans. Communication: Includes a TTL port for "Unicard" or Modbus connectivity. Primary Configuration Menus
The device operates using two levels of parameters to prevent accidental changes. Level 1 (User): Set Point: The target temperature. Differential (H01): The "swing" before the compressor kicks back on. Level 2 (Installer): Accessed by holding "Set" and "Down" for several seconds.
Contains deep logic for probe calibration and alarm thresholds. Defrost Management
This is where the SB655/C excels. It supports several defrost types: Turns on a heater. Reverses the cycle. Timed/Natural: Simply stops the compressor. Termination: Ends defrost based on time or evaporator temperature. Common Error Codes Air probe failure. Evaporator probe failure. High-temperature alarm. Low-temperature alarm. Installation Best Practices
Ensure the probe cables are separated from power lines to avoid interference.
Eliwell SB655 C (part of the Energy Flex range) is a universal parametric controller designed specifically for centralized air-conditioning units and chillers with up to two circuits. Key Features and Technical Specifications
The SB655 C is engineered for high energy efficiency and flexible management of HVAC systems. Compressor Management:
Supports Scroll, Semi-Hermetic, and Screw compressors with up to 4 power steps. Intelligent Control: Eliwell is now part of Schneider Electric
Features balanced operating hours for compressors, automatic summer-winter changeover, and a "Free Cooling/Free Heating" function. Connectivity: Fully supports Modbus RTU
protocols for integration into Building Management Systems (BMS). Inputs/Outputs:
5 Configurable Inputs (NTC, 4…20mA, 0...1V, 0...5V, 0...10V). 6 Digital Outputs (Relays).
TRIAC and PWM analogue outputs for modulating water pumps or condensation control. Power Supply: 12–24V AC or 24V DC. Programming and Configuration Guide
Technicians can configure the device via the front panel 4-button interface or a for quick parameter cloning.
Electronic controllers for centralised air-conditioning units
Here’s the direct answer:
The best official manual is the Eliwell SB 600 series user/technical manual that specifically covers models including SB 655 C.
| Criterion | Best Recommendation |
|-----------|----------------------|
| Official Document Name | “SB 600 Series – User and Maintenance Manual” (or “Installation and User Manual”) |
| Manufacturer | Eliwell (now part of Schneider Electric / Invensys) |
| Best Location to Download | 1. Schneider Electric official website (search “Eliwell SB 600” or “SB655C”)
2. HVAC-Talk or HVAC-Tools forums (archived manuals)
3. ManualsLib / ManualsOnline (free, scanned original) |
| Language | English (original Italian/English combo) |
| File Format | PDF |
| Typical Page Count | 30–50 pages |
⚠️ Caution: Avoid generic “quick start” guides – they omit advanced parameters. The full manual contains parameter maps (Pr1, Pr2), wiring diagrams, and probe configuration.