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Products  |  Thermal Engineering and HVAC  |  Refrigeration and Air Conditioning Technology  |  ET 144
ET 144 Electrical Installation in Refrigeration Systems Show data sheet (pdf file) Print page
Technical Description

The wiring of electrical components is a typical task in the field of refrigeration. Besides the design and operation of the individual components, knowledge about the interaction of the components in circuits is an important learning objective. Safety aspects also play an important role. With ET 144 this knowledge and these skills can be acquired.
  The electrical components are arranged clearly visible. All components are connected on terminal blocks. Using the cables included in the scope of delivery it is possible to set-up different circuits correctly and operationally. Lamps simulate the consumers. All components are operated and tested with mains voltage to provide high relevance for practice.
  There are electrical components for the start and operation of refrigerant compressors, such as e.g. electromagnetic start-up relay and capacitor. With a timer, circuits can be designed and examined for cyclical defrosting in refrigeration systems. This also includes the correct programming of the timer. Typical safety components, such as pressure switches, thermostats and circuit breakers are also included in the scope of delivery. These components enable the design and examination of a typical safety chain for refrigeration.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- Read, understand, wire and test electric circuit

- Design and operation of electrical components

  from refrigeration
  * start-up capacitor
  * operating capacitor
  * start-up relay
  * time relay
  * timer
  * circuit breaker
  * start-up current limiter
  * contactors
  * pressure switch
  * thermostat
  * solenoid valve
- Design and testing of a safety chain
- Star / delta connection
- Change of direction of rotation in an alternating

  current circuit
- Safety aspects when handling mains voltage



* Design and wiring of typical electrical circuits from

* Investigation of important electrical components

  from refrigeration1
* Design and investigation of a safety chain

Alternative products
ET 170 -- Electrical Faults in Simple Air Conditioning Systems
ET 171 -- Electrical Connection of Refrigerant Compressors
ET 172 -- Electrical Faults in Refrigerant Compressors
ET 174 -- Electrical Faults in Full Air Conditioning Systems
ET 340 -- Building Automation in Heating and Air Conditioning Systems
ET 930 -- Evaporator Control with Electronic Expansion Valve
[1] Experimental unit from the GUNT practical series for the training of mechatronics engineers for refrigeration
[2] Design and investigation of circuits with electrical components from refrigeration
[3] Electrical components mounted clearly visible and connected on terminal blocks
[4] 1 set of cables with wire end ferrules for wiring electrical components on terminal blocks
[5] 3 pressure switches, 2 thermostats, 1 solenoid valve, 1 timer, 4 circuit breakers, 5 contactors, 3 relays, 2 capacitors
[6] 5 lamps to simulate consumers
Technical Data

3 pressure switches
- high pressure: 8...32bar
- low pressure: -0.9...7bar
- differential pressure: 0.3...4.5bar
2 thermostats: -5...20C
1 timer
- 2 switchable outputs
- switching time: 1...60min
4 circuit breakers
- bimetallic circuit breaker
- thermistor circuit breaker
- circuit breaker with start-up current limiter
- adjustable protection relay
5 contactors
- 2x: 3 NO, 1 NC
- 3x: 4 NO
3 relays
- electromagnetic start-up relay
- PTC start-up relay
- time relay
Start-up and operating capacitor: 15F, 80F


Dimensions and Weight
l x w x h: 800 x 400 x 1000 mm
Weight: approx. 37 kg
Required for Operation
400V, 50Hz, 3 phases or 230V, 60Hz, 3 phases
Scope of Delivery

1 experimental unit

1 set of accessory (cables + wire end ferrules)

1 set of instructional material

Order Details

061.14400  ET 144  Electrical Installation in

                                Refrigeration Systems

© 2005 G.U.N.T. Gerätebau GmbH