Saginomiya E-UJ-44030-B Automation Control Circuit Panel Board for HVAC Systems

Product Overview

The Saginomiya E-UJ-44030-B is a control circuit panel board designed for automation applications, particularly in HVAC (heating, ventilation, air conditioning) and refrigeration systems. This board integrates relay outputs, logic control, and sensor inputs to manage compressors, fans, and defrost cycles. It is typically used in rooftop units, condensing units, and commercial refrigeration racks. The board is built for reliable operation in ambient temperatures ranging from -20°C to +60°C and is protected against voltage spikes and electrical noise.

Key Features of E-UJ-44030-B

The board includes multiple digital inputs for pressure switches, thermostats, and flow sensors, as well as analog inputs for temperature sensors (NTC or PTC). It provides several relay outputs (typically 4-8) rated at 24 V AC or 240 V AC for controlling contactors and valves. Onboard microcontroller executes a pre-programmed control sequence, including anti-short cycle timing, fan delay, and defrost scheduling. The board features LED indicators for power, output status, and fault conditions.

The E-UJ-44030-B is powered by 24 V AC from a control transformer. It includes a built-in real-time clock for time-of-day scheduling. The board can be configured via DIP switches or a local keypad/display (if equipped). It has a compact size suitable for mounting inside an electrical enclosure. The terminal blocks are screw-type for secure field wiring. The board is compliant with CE and RoHS standards.

Technical Specifications

• Manufacturer: Saginomiya (now part of Danfoss or independent)

• Part Number: E-UJ-44030-B

• Product Type: Automation Control Circuit Panel Board

• Power Supply: 24 V AC ±10%, 50/60 Hz

• Power Consumption: 5 VA (max)

• Digital Inputs: 6 (dry contact or 24 V AC)

• Analog Inputs: 2 (for NTC thermistors, 0-10 V, or 4-20 mA)

• Relay Outputs: 4 (2A @ 240 V AC resistive)

• Control Modes: On/off, time proportioning, defrost timer

• Configuration: DIP switches or optional keypad

• Indicators: Power, output status LEDs

• Operating Temperature: -20 to +60 °C

• Storage Temperature: -40 to +85 °C

• Degree of Protection: IP00 (open board)

• Terminal Type: Screw clamp

• Dimensions: 150 mm x 120 mm x 40 mm (approx.)

• Certifications: CE, RoHS

Functional Description

The board continuously reads sensor inputs (e.g., space temperature, coil temperature) and compares them to setpoints defined by DIP switches or external potentiometers. It then energizes relay outputs to start or stop compressors, fans, or heating elements. An anti-short cycle timer prevents rapid cycling of compressors. Defrost control can be timer-initiated or demand-based using coil temperature sensors. LED indicators show which outputs are active, aiding troubleshooting. The board also includes a lockout function after multiple faults, requiring manual reset.

Applications

The E-UJ-44030-B is used in commercial HVAC units, walk-in coolers, freezers, heat pumps, and air handling units. It serves as a replacement control board for Saginomiya-based equipment.