The Seungil SI-COOL8 series is a single-channel digital temperature controller and limiter with a clear LCD display and an integrated audible/visual alarm. Designed specifically for cold storage warehouses, refrigeration units, and industrial heating/cooling systems, it combines precise temperature regulation with essential safety limiting functions. The series includes multiple application-specific models: ST-S0 for 6-step heating control, ST-S1 for 5-step cooling control, CH-S0 for combined electric heating and refrigeration, CR-S6 for compressor control, and RD for radiator control. A 1-channel PT100 RTD input delivers accurate temperature measurement, while eight digital inputs, eight relay outputs, and RS-485 Modbus RTU communication provide comprehensive control and integration capabilities. The 100-240 VAC universal power supply allows installation worldwide without voltage converters.

Clear Display and Advanced Alarm Functions

• LCD Display with Visual Alarm: The front panel features a high-contrast LCD screen that simultaneously displays current temperature, setpoint, and operational status. A built-in visual alarm indicator flashes when any alarm condition is triggered, providing immediate notification to personnel on the factory floor.
• 10-Event Alarm History: The controller stores up to 10 alarm events with timestamps, enabling maintenance teams to review past temperature excursions and diagnose recurring problems without continuously monitoring the system. This audit trail is particularly valuable for cold chain compliance and quality assurance.
• Configurable Alarm Thresholds: High and low temperature limits can be independently programmed, with separate relay activation for each alarm level. When combined with the limiter function, this ensures critical temperature limits are never exceeded without automatic protective action.

Flexible Control for Multiple Applications

• Heating Control (ST-S0 Model): The 6-step electronic heating controller manages multiple heating banks with sequential staging, preventing sudden power surges and providing smooth, energy-efficient temperature ramp-up. Ideal for cold storage defrost cycles and industrial heating processes.
• Cooling Control (ST-S1 Model): The 5-step cooling controller stages compressors or cooling valves, preventing short cycling and extending equipment life. Suitable for refrigeration units, walk-in coolers, and air conditioning systems.
• Compressor Control (CR-S6 Model): Dedicated compressor protection logic includes minimum off-time delays, preventing compressor damage from repeated start/stop cycles. Essential for refrigeration systems where compressor reliability directly impacts product safety and operating costs.
• Radiator Control (RD Model): Temperature-based control of fans and circulation pumps for heat rejection systems, maintaining optimal condensing temperatures in industrial refrigeration plants.

Reliable Operation in Demanding Environments

• 8 Digital Inputs and Outputs: The controller accepts 8 digital inputs (24 VDC) from door switches, pressure switches, and other binary sensors, and provides 8 relay outputs rated at 250 VAC/3A for direct control of contactors, solenoids, and alarm devices. This extensive I/O reduces the need for external relays and simplifies panel wiring.
• RS-485 Modbus RTU: The standard RS-485 communication interface enables integration with PLCs, SCADA systems, and building management systems. Modbus RTU protocol ensures compatibility with virtually all industrial control equipment.
• 100-240 VAC Universal Power: The wide-range power supply accepts any industrial mains voltage worldwide without requiring jumpers or transformer adjustments, simplifying international deployment and spare parts inventory.
• PT100 RTD Input: The platinum resistance temperature sensor provides linear, accurate measurement with long-term stability, making it suitable for applications where consistent temperature monitoring is critical for product quality and safety compliance.

Applications

• Cold storage warehouse temperature monitoring and control
• Refrigeration unit compressor and defrost control
• Industrial cooling system temperature regulation and safety limiting
• Food and pharmaceutical cold chain compliance monitoring
• HVAC system heating and cooling stage control