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ET 192

- Practical service tasks in refrigeration systems
- Replace typical components of a refrigeration system: compressor, pressure switch, filter/drier, solenoid valve and expansion valve
- Siphoning off, displacing refrigerant, replacement, evacuation, filling and adjustment


Technical Description

The replacement of a faulty compressor or other components of the refrigeration system are amongst the repeated activities of a mechatronics engineer for refrigeration. ET 192 allows for training in these processes. The consequences of incorrect procedures can be demonstrated. 

The components are integrated into an operational refrigeration system. This allows for the practical testing of the functionality of individual components after replacement. The following activities must be carried out e.g. after replacing a compressor: 
- Refrigerant displacement (pump-down) into the condenser/receiver (should this not be possible: siphoning off the refrigerant)
- Disconnection of the compressor at the service valves
- Disconnection of electrical connections
- Compressor replacement, correcting oil level, if necessary
- Reconnecting electrical connections
- Reconnecting the compressor with the service valves
- Evacuating the compressor and making the connection to the system
- Compressor test run, checking for leaks and replenish refrigerant, if necessary
- Checking the system pressures 

  To carry out the service tasks, the tool set ET 150.02 and the filling and evacuation equipment  ET 150.01 are required. 

  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the exercises.

Learning Objectives / Experiments

- Familiarisation with and carry out basic activities for the servicing of refrigeration systems
- Replacement of 
  * compressor
  * pressure switch
  * filter/drier
  * solenoid valve 
  * expansion valve
- Refrigerant displacement (pump-down)
- Mechanical and electrical assembly and disassembly of components
- Replenish refrigerant and compressor oil
- Leak test
- Compressor test run
- Adjustment of expansion valve and pressure switch



[1] Trainer from the GUNT practical series for the training of mechatronics engineers for refrigeration 
[2] Service exercises in refrigeration systems
[3] Complete refrigeration circuit with open compressor, air-cooled condenser, receiver and air cooling evaporator
[4] Replaceable components: compressor, filter/drier, pressure switch and solenoid valve
[5] Recommended accessories evacuation equipment ET 150.01 and tool set ET 150.02
[6] Overall arrangement on robust workbench
[7] Refrigerant R134a, CFC-free

Technical Data

Open refrigerant compressor
- drive power: 0,75kW
- refrigeration capacity: 1245W at -5°C/36°C
- maximum system pressure: 18bar

Pressure switch
- LP: -0.2...7bar
- HP: 10...32bar

Dimensions and Weight
l x w x h: 1400x750x1650mm
Weight: approx. 150kg Required for Operation 230V, 50Hz, 1 phase

Scope of Delivery
1 trainer
1 set of instructional material

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