You do not always need the manual for everyday operations. Here are quick commands:
The Eliwell SB655/C is a programmable electronic controller designed for centralized air-conditioning units.
The following information summarizes the core technical manual text for installation, configuration, and alarm troubleshooting. For the full document, you can refer to the official technical documentation on the SB 655 series. 1. Installation and Electrical Connections
Safety Isolation: Low-voltage (SELV) utilities must be wired separately from high-voltage lines to prevent electrical interference.
Load Connection: Carefully follow the connection diagrams provided on the instrument label. Incorrect wiring of loads can damage the controller. 2. Configuration Parameters
Configuration is determined by values associated with physical inputs and outputs (I/O). Key folders in the menu include: PAR/UI: User Interface settings. PAR/CL/Cr: Configuration for physical I/O.
DOL/AOL: Digital Output Configuration. Values typically range from -53 to 53 for specific digital output configurations. 3. User Interface & Menu Navigation
Full Menu Access: Press and hold the SET button for more than 5 seconds.
Password Entry: When PA2 appears, press SET twice more, then use the arrow buttons to enter the security code (factory default is often 22) and press SET to confirm. eliwell sb655 c manual
Folders: Settings are organized into folders such as AL (Alarms), CP (Compressor), and FnC (Functions). 4. Alarm Codes and Troubleshooting Action/Check AL1 Low temperature alarm (Probe 1)
Check current temperature on display and verify the limit set in parameter LA1. EA External Alarm
Check digital inputs configured as external alarms (H11 to H14). Opd Open Door Alarm
Verify status and polarity of the door switch digital input (H11 to H14).
Electronic controllers for centralised air-conditioning units
The Eliwell SB655 C is a workhorse of the refrigeration industry. Whether you are building a new cold room or repairing a frozen display case, understanding its manual is key to a long, trouble-free service life.
To summarize:
For detailed specifications, installation diagrams, and advanced defrost configurations, download the official Eliwell SB655 C manual from a trusted source. When in doubt, call a certified HVAC-R technician — improper wiring or parameter changes can lead to spoiled goods or equipment damage. You do not always need the manual for everyday operations
This guide is for informational purposes. Always consult the original manufacturer’s documentation specific to your unit’s revision before performing electrical work.
The Eliwell SB655/C is a universal electronic controller designed for centralized air-conditioning units and chillers with up to two circuits. It is part of the Energy Flex range, specifically tailored for managing complex HVAC systems. Core Functionality
Compressor Management: Controls up to 4 power steps for Scroll, Semi-Hermetic, or Screw compressors. It includes logic for balancing operating hours between units, even if they have different capacities.
Universal HVAC Control: Manages single or double-circuit systems, including air-air, air-water, and water-water heat pumps or chillers.
Operating Modes: Features automatic summer-winter changeover and supports "Free Cooling" and "Free Heating" modes to optimize energy efficiency. Technical Specifications Inputs/Outputs:
Analogue Inputs: 5 configurable sensors (NTC, 4…20mA, 0...10V). Digital Inputs: 6 inputs for status or alarm signals. Relays: 6 digital outputs (relays) for system control.
Power Supply: Typically 12-24Va or 24Vc depending on the specific model variant.
Connectivity: Native support for Modbus and Televis communication protocols for integration into BMS (Building Management Systems). Standard User Interface Operations Display: Uses a 4-digit display with 18 status icons. Navigation: The Eliwell SB655/C is a programmable electronic controller
Scroll: Use the UP and DOWN arrows to navigate folders and parameters.
View Setpoint: Press the SET key once to see the current setpoint; press again to see the value.
Edit Value: While viewing a value, use UP/DOWN to adjust it and SET to confirm.
Exit: Press the FNC (function) key to return to the previous level or exit without saving.
Alarms: Reset active alarms by pressing UP + DOWN simultaneously. Common Troubleshooting Codes
E1 / E2: Fault on probe 1 or 2 (shorted or interrupted). Check probe type parameter H00 to ensure it matches the physical sensor.
AH1 / AL1: High or Low temperature alarm on probe 1. These are typically recorded in the AL folder.
Electronic controllers for centralised air-conditioning units
Without the manual, programming the SB655 C is nearly impossible. The controller uses a "secret" menu system where parameters are hidden behind access codes. Guessing wrong can lead to frozen goods, spoiled food, or compressor burnout.