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Products  |  Thermal Engineering and HVAC  |  Refrigeration and Air Conditioning Technology  |  ET 340
ET 340 Building Automation in Heating and Air Conditioning Systems Show data sheet (pdf file) Print page
ET 340 - A product from the GUNT 2E range
Technical Description

Heating and air conditioning technology is a key topic in building services engineering. For the control and monitoring of heating and air conditioning systems DDCs (Direct Digital Control) or PLC air conditioning controllers are usually used in building services engineering. The controller is adjusted to the respective tasks by programming, making additional cabling unnecessary.
  With ET 340 the operation and programming of a DDC for a heating and air conditioning system can be learned. The process schematics for the two simulated systems are shown on the front panel.
  The simulated heating system has two boilers connected in parallel. The feed flow temperature is controlled through the outside temperature using 3-way mixing valves. There are two heating lines with simulated heaters and different actuators: 3-way mixing valves and pumps. An additional 3-way mixing valve is the actuator for water heating.
  The simulated air conditioning system with air heater, air cooler and fans can be operated in outer air and recirculated operation via flaps with a motor as actuator.
  Both process schematics contain potentiometers simulating e.g. a change in the outside, room or feed flow temperature. Bargraph displays and lamps indicate the operating states of the actuators.
  In addition to manual configuration and parameterisation via buttons, the DDC can also be adjusted for the respective control task using the 

configuration software supplied. It further enables the monitoring of safety devices such as a low water cut-off in the boiler. The simulation of faults, such as triggering the differential pressure switch at the fan, can be carried out via buttons.
   The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- Operation and programming of a DDC
- Effects of temperature changes on the operating

  behaviour of a
  * heating system
  * air conditioning system
- Fault finding in a
  * heating system
  * air conditioning system
- Safety devices


* Operation and programming of a DDC for heating

  and air conditioning systems1
* Simulated heating system with water heating1
* Simulated air conditioning system with outer air

  and recirculating operation

Alternative products
ET 174 -- Electrical Faults in Full 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] Operation and programming of a DDC for heating and air conditioning systems
[3] Process schematic of the simulated heating system with 2 boilers, 2 heating lines and water heating
[4] Process schematic of the simulated air conditioning system with selectable outer air and recirculating operation
[5] Programmable DDC with selection and display of the operating states and error simulation
[6] Process schematics with bargraph displays and lamps for operating states of the actuators
[7] 16 potentiometers in the process schematics to adjust simulated temperatures
[8] Process schematics on the front panel
Technical Data
- 16 digital inputs
- 8 digital outputs
- 16 analogue inputs
- 8 analogue outputs
- control circuits: 4
- PLC functions
- auxiliary energy: 24VAC
- 14 buttons to select the operating states
- 16 buttons for error simulation
Bargraph display measuring range: 0...100%
Dimensions and Weight
l x w x h: 1350 x 400 x 1050 mm
Weight: approx. 30 kg
Required for Operation
230V, 50/60Hz, 1 phase oder 120V, 60Hz, 1 phase
Scope of Delivery

1 experimental unit
1 set of instructional material

Order Details

061.34000  ET 340  Building Automation in Heating

                                and Air Conditioning Systems

© 2005 G.U.N.T. Gerätebau GmbH