Products  |  Thermodynamics, Heating and Sanitary Systems  |  Refrigeration and Air Conditioning  |  ET 930
ET 930 Trainer Refrigeration Control Show data sheet (pdf file)
Technical Description
The handling of a case controller as used in commercial cooling units can be trained with the benchtop unit ET 930. The case controller with programming unit, expansion valve and pressure transmitter are real components. Other components of a refrigeration system as evaporator or compressor are simulated in the supplied software. The case controller monitors continuously the functioning of the components and triggers an alarm when faults occur.
The software simulates the behaviour of a freezer at different operating states. The temperature and pressure distributions and the switching modes of expansion valve and compressor are displayed in the screen “measured values as a function of time”. Ambient temperature and the refrigerant can be chosen in the system diagram, coloured buttons indicate the operating state of the components.
All components, signal lamps, switches and a system diagram are clearly arranged on the front panel.
 
Learning Objectives / Experiments
- Functioning of a case controller
- Programming of a case controller using a manual
  control panel (programming unit)
- Day and night mode 
- Operation with open and closed freezer
- Automatic defrost 
- Monitoring of components
- Fault finding
Features
* Functioning of a case controller: commissioning,
  programming, fault finding1
* Simulation of a commercial freezer
Alternative products
ET 170 -- Domestic Air Conditioning Controls
ET 171 -- Compressor Controls Trainer
ET 172 -- Refrigerant Compressor Fault Simulator
ET 174 -- Industrial Air Conditioning Controls
ET 340 -- HVAC Simulator
Specification

[1] Study of an industrial case controller in a commercial freezer
[2] l x w x h: 660x350x530mm, 20kg
[3] Real components: case controller with control panel, expansion valve, pressure transmitter, temperature probe; other components simulated in LabView software
[4] Case controller controls: fan, rail heat, expansion valve, day / night output, compressor, alarm, defroster, defrost start
[5] Front panel with system diagram, signal lamps
[6] Connection to PC via USB
[7] LabVIEW software under Windows XP
[8] 230V, 50/60Hz, 1 Ph. or 120V, 50/60Hz, 1Ph.

 
Technical Data

Temperature measurement points

- environment

- refrigerant outlet

- air before and after evaporator

- evaporator surface (defrost sensor)

 
USB box

- 8x analogue in

- 2x analogue out

- 20x digital in

- 20x digital out
 

System requirements: Windows XP 

 
Dimensions and Weight
l x w x h : 660 x 350 x 530 mm
Weight : approx. 20 kg
Connections

230V, 50/60Hz, 1 ph. or 120V, 50/60Hz, 1 ph.

Scope of Delivery

1 trainer, completely assembled

1 software CD

1 manual
Order Details
061.93000  ET 930  Trainer Refrigeration Control
© 2005 G.U.N.T. Gerätebau GmbH