• A complete ready to use training package
• Fault diagnosis by logical elimination  
• Actual faults produced and not simulated
• Designed for fail safe operation
• Uses ozone friendly R134a refrigerant
• Fully documented assignments

The system has been designed to teach a methodical approach to fault finding in an industrial process.

A self-contained refrigeration unit made from industrial standard compo- nents. The design enables practical instruction to be given on methods of identifying and correcting faults in industrial systems, in exactly the same way as experienced in field service conditions.

The system consists of a mobile, floor-standing process unit comprising a twin cylinder semi-hermetic compressor, finned tube condenser with fan, liquid receiver and forced air evaporator. All the above are mounted on a common base plate for easy access.

Curriculum covered

Unit performance & operation

• Operation of the unit
• Unit charging and discharging
• Non-condensable gases and their effects

Normal & abnormal operating pressures

• High condensing pressures
• Low evaporating pressures

Refrigerant changes of state

• Variations in liquid states
• Variations in vapour states

Compressor testing & overhaul

• Checking compressor oil levels
• Compressor pumping efficiency
• Effects of faulty compressor reed valve

Thermostatic expansion valves

• Operation and adjustment of thermostatic expansion valves
• On-site repairs of thermostatic expansion valves
• Replacement of faulty thermostatic expansion valves

Removal of system contamination and plant charging

• System evacuation
• Transferring refrigerant into a charging cylinder
• Liquid charging

Electrical components & controls

• Electric motor testing
• High & Low pressure cut-out control, operation & adjustment
• Continuity testing

Air conditioning applications

• Measuring the psychrometric properties of air
• Cooling & de-humidifying of air
• The complete air conditioning plant