Refrigerator Model Training System

1. Scope of Supply

The supplier shall provide complete Basic Refrigeration Training Device, fully assembled, tested, and ready for operation, including all standard accessories, documentation, and training materials as specified herein.

The equipment shall be designed for vocational and technical education in refrigeration and air-conditioning fundamentals with RFID power management system including installation, operation, control, maintenance, and troubleshooting.

2. General Description

The Basic Refrigeration Training Device shall be a fully operational refrigeration system configured on a movable training bench. The system shall replicate the structure and working principles of a split-type air-conditioning unit and allow hands-on practice of:

• Refrigeration cycle operation
• Electrical control circuit wiring
• System commissioning and debugging
• Maintenance and fault diagnosis
• Performance measurement and analysis

The system shall include clearly arranged and labeled components, transparent observation ports, complete refrigeration piping, and fully wired electrical circuits suitable for instructional use.

Refrigerant used shall be R134a or equivalent environmentally acceptable refrigerant.

3. Construction Requirements

3.1 Mechanical Structure

• Bench-type structure constructed from aluminum profile and sheet metal
• Overall dimensions (Minimum):
  1200 (L) × 700 (W) × 1600 (H) mm
• Mounted on four casters:
  • Two (2) with brakes
  • Two (2) without brakes
• Front demonstration panel with:
  • Screen-printed refrigeration circuit diagram
  • Color-coded piping (red/blue to indicate refrigerant state)
  • Clearly marked component layout

4. Technical Parameters

5. Main Components and Specifications

The system shall include, but not be limited to, the following components:

5.1 Refrigeration Components

• Compressor
  • Power: 1/3 HP (minimum)
  • Voltage: 220V AC, 50Hz
  • Compatible with R134a or equivalent gas
• Condenser
  • Natural cooling
  • Refrigerant ports: 6.4 mm inlet/outlet (minimum)
  • Adjustable fan speed (if applicable)
• Evaporator with Fan
  • Direct expansion type
  • Ports: 1/4" (minimum)
  • Internal volume approx. 412 × 310 × 290 mm (±10%)
  • Includes refrigerator and freezer compartments
• Throttling Device
  • Capillary tube type
• Filter-Drier
  • 1/4" service ports (minimum)
• Service Valves
  • High-pressure and low-pressure ports (1/4") (minimum)
• Manual Valves
  • Flare-threaded connection
  • 1/4" pipe diameter (minimum)
• Sight Glass
  • Installed on liquid line, suction line, and evaporator inlet (3 pcs)

5.2 Instrumentation and Measurement

• Low-Pressure Gauge
  • Range: -30 ~ 260 psi / -0.1 ~ 1.8 MPa
• High-Pressure Gauge
  • Range: -30 ~ 550 psi / -0.1 ~ 3.8 MPa
• Analog Voltmeter
  • 0 ~ 250 V
• Analog Ammeter
  • 0 ~ 10 A
• Digital Thermometers (4 pcs)
  • Range: -40°C to +90°C
  • NTC thermocouple (10KΩ at 25°C)
• High/Low Pressure Controller
  • Flare threaded connection
  • Pipe diameter: Φ6 mm

5.3 Electrical System

• Earth Leakage Circuit Breaker (220V, 16A)
• Self-locking key switch
• Emergency stop button (self-locking)
• Overload protector (10A) (minimum)
• Indicator lights (minimum 5 pcs)
• Digital temperature controller and sensor
• Complete control wiring ready for training exercises

6. RFID Power Management System (Mandatory)

The system shall include an integrated RFID-based power management system with the following features:

• Operating frequency: 13.56 MHz (High Frequency)
• Communication via RS485 or standard
• Audible status prompts
• LED indication
• OLED display for card number and error codes
• Data verification function
• Parameter configuration software
• Support for:
  • ISO-15693 protocol
  • ModBus_TCP
  • ModBus_RTU

The RFID system shall allow card-based activation of the equipment and enable instructional management control.

7. Standard Accessories

The following accessories shall be supplied:

• Dual compound pressure gauge set (for R404A, R407C, R134a, R22)
• Digital thermometer
• AC clamp meter (600V AC/DC, 600A AC, capacitance & resistance measurement)
• Vacuum pump (1L capacity)
• Tool kit including:
  • Oxygen cylinder (2L)
  • Fuel gas cylinder
  • Welding torch
  • Toolbox
• R134a refrigerant (1 unit)
• Neon test light (12–250V)
• Experiment manual (1 copy)

8. Functional Capabilities

The equipment shall support the following instructional exercises:

• Compressor wiring practice
• Refrigeration control circuit construction
• System start-up and operation management
• Refrigeration characteristic analysis
• Mollier diagram plotting
• System performance calculation
• Troubleshooting and fault diagnosis
• Pressure and temperature measurement
• Refrigerant charging and evacuation practice