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Mar 1, 2013 - Building

Comfort And Energy Efficiency – Building Automation on the iPAD

Low energy consumption was one of the main goals that Günther Heumann pursued when he was planning his new corporate headquarters. At the same time, he wanted to demonstrate modern building automation to his customers. A WAGO ETHERNET Controller and an app for the iPad form the basis of the building automation.

The new corporate headquarters for Elektro-Service Heumann GmbH offers Managing Director Günther Heumann and his ten employees 400 m2 of office and storage space. During planning, special focus was placed on guaranteeing an optimal climate in the space while maintaining low energy costs. Thus, for example, the south-facing facade is nearly all glass, so that the sun warms up the rooms during the colder seasons. Blinds ensure that the temperature does not climb too high in the summer.

A wood-fired furnace with an output of 14.5 kW provides the building with warm-air heat if the solar radiation alone is not sufficient. In cold weather, a cross-stream heat exchanger uses the exhaust air to warm the supply air so that very little energy is required for heating. It is also possible to cool the rooms using the supply air. To accomplish this, flat collectors were located under the parking garage, which use a brine pipeline and a heat exchanger to cool the supply air.

Central Control of the Air Conditioning

Günther Heumann uses the WAGO-I/O-SYSTEM with the 750-881 ETHERNET Controller to automate climate control. The ETHERNET Controller adjusts the supply and exhaust air flaps in the individual rooms, the cross-stream heat exchanger, the ventilator motors, the heating, the pump for cooling, and the SMI drives for the blinds. Temperature sensors in the rooms provide the current actual value; the controller compares this to the value set by the user in order to adjust the flaps of the ventilation accordingly. The WAGO-I/O-SYSTEM thus controls and regulates the entire climate control. Günther Heumann and his team created the CODESYS programming themselves in accordance with IEC 61131-3.

Light, Sound, and Video Monitoring

The building automation at Elektro-Service Heumann is also supposed to fulfill another important requirement: The company would like to demonstrate to its customers what is possible using this type of solution. To achieve this, all systems were supposed to be incorporated into the central automation if possible. Thus, in addition to HVAC for individual rooms, the WAGO controller regulates the lighting via a DMX bus, and also controls video monitoring and a Bose multi-room sound system. Touch-panel controls in the individual rooms transmit user inputs to the automation technology using EnOcean wireless technology. Special sensors in the window handles also communicate via EnOcean; signaling the controller whether the window is open, tipped, or closed.

Operation via iPad

However, the highlight of the entire automation system is the user interface on the Apple iPad. The user can program all automation settings centrally and call up all functions individually. At the same time, Lighting energy reduction Parameterizing and visualization of the building automation using an iPad Control of HVAC, lighting, video monitoring, and the Bose multi-room sound system the “AmbientRC” app, created by Günther Heumann, provides an overview of the current status of the building automation – the current electrical power consumption for the entire building is depicted, among other things. To display the building automation information on the iPad, the controller generates the appropriate xml files and stores them on the internal Web server. The app then visually displays the information on the iPad.

Company owner Heumann is completely satisfied, “From the lighting control through the blinds to the incorporation of sound systems, the WAGO ETHERNET Controller offers a lot of possibilities that we have exploited here in our own building.”


  • Lighting energy reduction
  • Parameterizing and visualization of the building automation using an iPad
  • Control of HVAC, lighting, video monitoring, and the Bose multi-room sound system

Text: Detlef Holfelder, WAGO
Photo: Elektro-Service Heumann, WAGO

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