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The standard security code is . Use the arrow keys to enter it, then press SET. Manual Reset

Confirm by pressing the button once more, or hit ESC to exit without saving changes. Forcing a Manual Defrost

Full support for Modbus and Televis systems for remote monitoring. 2. Key Sections of the Eliwell SB655/C Manual

controller belongs to the line. It handles up to 2 circuits and a maximum of 4 compressor steps . Below is a look at its fundamental engineering features:

Electronic controllers for centralised air-conditioning units

Manages balanced operating hours for compressors, allowing for different power capacities, which maximizes the lifespan of your equipment.

Eliwell SB655/C (part of the Energy Flex range) is a universal electronic controller designed for centralized air-conditioning units, chillers, and heat pumps. It is specifically engineered to manage up to two circuits and up to four compressor power steps. Frigo Soğutma Key Features Compressor Management

Before powering the unit, correct wiring is essential. The SB655C is versatile, but incorrect wiring can damage the relays or the compressor.

Accessible without password verification; provides basic setpoint and defrost monitoring.

| | Function / Meaning | | :---------------------------- | :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | UP Key (▲) | Scroll through menus, increase values, or activate a manual defrost by holding for 5 seconds. | | DOWN Key (▼) | Scroll through menus, decrease values. | | SET Key (Enter) | Access the "Machine Status" menu, confirm commands, or enter the "Programming" menu by holding for 5 seconds. | | FNC / ESC Key (Stand-by) | Exit menus, cancel operations, or activate Stand-by mode (when not in menus) by holding for 5 seconds. | | Compressor LED | Solid ON: Compressor is active. Blinking: Delay, protection, or blocked activation is in progress. | | Defrost LED (Defrost) | Solid ON: Defrost cycle is active. Blinking: Manual or digital input activation is pending. | | Fan LED | Solid ON: Fans are active. | | Alarm LED (Alarm) | Solid ON: An alarm condition is present. Blinking: Alarm has been silenced by the user. |

If the screen displays " LOC ," the keypad is locked. To disable this, enter the Basic Commands menu and press the UP and DOWN keys simultaneously for 2 seconds. Common Alarm Codes

: Features a dedicated, built-in RS-485 communication port natively supporting Modbus and Televis protocols for BMS (Building Management System) integration. I/O Allocation Configuration

| Parameter | Name | Recommended Setting | Why it matters | | :--- | :--- | :--- | :--- | | | Setpoint | 2°C to 5°C (Cooler) | The target temperature. | | Hy | Differential (Hysteresis) | 1.0°C to 2.0°C | Prevents short cycling. If SP=3°C and Hy=2°C, the compressor cuts in at 5°C and out at 3°C. | | LS | Minimum Setpoint Limit | -30°C | Prevents users from setting a temp too low. | | US | Maximum Setpoint Limit | 10°C | Prevents users from setting a temp too high. | | OdO | Off delay after defrost | 0 minutes | Time delay before compressor re-starts after defrost (dripping time). | | dtE | Defrost type | EL (Electric) or IN (Hot gas) | Critical setting. Wrong type blows fuses. | | idd | Interval between defrosts | 6 (hours) | How often defrost runs. | | Ld | Maximum defrost duration | 30 (minutes) | Safety timer to prevent overheating coils. | | ALu | High temperature alarm | 10°C | Alerts if the cold room stays above 10°C. | | ALL | Low temperature alarm | -5°C | Alerts if freezing too much (for coolers). |

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

Do not exceed the maximum load capacity of the relays. For heavy loads, use external contactors. 4.2. Thyristor Output Configuration

Must be powered using an external transformer that perfectly matches the technical voltage requirements specified on the product ID plate.

The front-panel LEDs and display provide instant feedback: