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ET 340


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 


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