Single-Split Type Cooling / Heating Air Conditioner

1. GENERAL

1.1 Scope of Works

The Contractor shall supply, deliver, install, test, commission, and hand over complete Split Air Conditioner Training Device, suitable for technical and vocational education and training (TVET) laboratories.

The equipment shall comprise a fully operational split-type air conditioning system mounted on a mobile training platform, including indoor and outdoor units, instrumentation, fault simulation modules, accessories, and instructional documentation.

The unit shall be complete in all respects and ready for immediate instructional use.

1.2 Purpose

The training device shall enable:

• Demonstration of installation procedures of split-type air conditioners
• Study of refrigeration cycle and system components
• Operation in both cooling and heating modes
• Practical maintenance and troubleshooting exercises
• Measurement and performance analysis
• System fault diagnosis training

1.3 Applicable Standards

The equipment shall comply with applicable international standards, including but not limited to:

• IEC standards for electrical safety
• ISO standards for refrigeration systems
• Local electrical and laboratory safety regulations
• Environmental standards related to refrigerant handling

All refrigerants supplied shall comply with international environmental regulations.

2. SYSTEM DESCRIPTION

The Split Air Conditioner Training Device shall be based on a real commercial split-type air conditioner system and shall consist of:

• One (1) indoor wall-mounted evaporator unit
• One (1) outdoor condenser unit (variable frequency type)
• Integrated refrigeration piping with service access
• Instrumentation panel
• Fault simulation system

Both indoor and outdoor units shall be mounted on a common aluminum structural training frame with heavy-duty casters.

The system shall operate in:

• Cooling mode
• Heating mode (reverse cycle operation)

3. MECHANICAL CONSTRUCTION

3.1 Training Platform

• Dimensions Minimum
  1200 mm (L) × 1000 mm (W) × 1750 mm (H)
• Rigid aluminum bracket structure
• Four (4) heavy-duty casters:
  • Two (2) with brakes
  • Two (2) without brakes
• Clear layout for maintenance and instructional visibility
• All components labeled with text and refrigeration circuit diagrams

3.2 Refrigeration System

3.2.1 Refrigerant

• Refrigerant: R410A or approved equivalent

3.2.2 Outdoor Unit (Condenser Section)

Shall include:

• Inverter compressor, 220VAC
• Refrigerant: R410A or equivalent
• Condenser capacity: Minimum 4.1 kW
• Cooling method: Forced air
• Evaporator capacity: Minimum 3.5 kW
• Cooling method: Direct expansion
• Capillary tube refrigeration controller
• Welded filter drier
• Three-way inspection valves:
  • Gas line: Minimum 3/8 inch
  • Liquid line: Minimum 1/2 inch

3.2.3 Indoor Unit (Wall-Mounted Evaporator)

• Wall-mounted type
• Integrated temperature controller
• Fully operational in cooling and heating modes

3.3 Refrigeration Circuit Accessories

The refrigeration system shall include:

• Observation sight glass (welded type)
• Manual valves (minimum 2 pcs, flared connection, Φ6)
• High-pressure and low-pressure gauges:
  • Low pressure: -30 to 500 psi (0–35 kg/cm²)
  • High pressure: 0–800 psi (0–55 kg/cm²)
• High and low pressure controllers
• Flared thread connections Φ6 mm

4. ELECTRICAL SYSTEM

4.1 Power Requirements

• Single-phase 220V ±10%
• Frequency: 50Hz
• Rated current: 16A (Minimum)

4.2 Control Panel

The instrument control panel shall include:

• Pointer voltmeter (0–250V)
• Pointer ammeter (0–10A)
• On/Off control
• Residual current circuit breaker 16A (Minimum)
• Overload protector 10A (Minimum)
• Key start switch (self-locking type)
• Emergency stop button (self-locking type)
• Minimum five (5) indicator lights
• Four (4) digital temperature displays

All wiring shall be internally routed and clearly identified.

4.3 Temperature Measurement

Digital temperature display units shall meet:

• Power supply: 220V ±10%
• Range: -50°C to +110°C
• Accuracy: ±0.5°C
• Resolution: 0.1°C
• Sensor type: NTC with protective sheath

Quantity: 4 sets.

5. FAULT SIMULATION SYSTEM

The equipment shall include:

• Minimum ten (10) independent fault-setting units
• Fault troubleshooting and testing modules

The system shall allow simulation of common air-conditioning faults for training purposes.

6. INSTRUMENTATION AND TRAINING ACCESSORIES

The following standard accessories shall be supplied:

• Dual composite pressure gauge set (compatible with R410A, R404A, R407C, R134a, R22)
• Wrench set (7-piece)
• Digital anemometer:
  • Wind speed: 0.3–45 m/s
  • Temperature measurement function
• Flaring and expanding tool kit:
  • Metric: 6–19 mm
  • Imperial: 1/4"–3/4"
• Toolbox including:
  • 2L oxygen cylinder
  • Gas cylinder
  • Welding torch
• Ultrasonic leak detector
• Two-stage vacuum pump
• Neon test pen (12–250V)
• R410A refrigerant
• Practical training manual

7. FUNCTIONAL REQUIREMENTS

The system shall allow students to perform:

• Identification of split air conditioner components
• Installation training of split-type air conditioner systems
• Refrigeration cycle observation
• Experimental data measurement and acquisition
• Application of enthalpy-humidity (psychrometric) charts
• System fault diagnosis
• Performance calculation
• Analytical discussion and reporting

8. SAFETY REQUIREMENTS

The system shall include:

• Residual current protection
• Overload protection
• Emergency stop device
• Clearly labeled service valves
• Secure refrigerant connections
• Safe handling procedures for refrigerant charging and recovery

All exposed rotating or live parts shall be properly guarded.