Energy Savings Using Wireless Products

Saving energy in a building offers a wide range of benefits, from lowering utility bills to reducing environmental impact. Energy efficiency not only helps property owners and facility managers cut costs, but it also contributes to a more sustainable future by reducing greenhouse gas emissions and easing demand on the power grid. On top of these advantages, many cities, states, and municipalities now require energy-saving measures as part of building codes, making efficient controls not just a smart choice—but a necessary one for compliance.

Greatest Energy Savings: HVAC and Lighting

The most significant opportunities for energy savings in a building typically come from two key systems: HVAC and lighting. Heating, ventilation, and air conditioning systems account for a large portion of energy use in commercial and residential buildings, meaning small efficiency improvements can lead to substantial savings. Lighting, especially in large facilities, also represents a major energy expense. By integrating smart controls, occupancy sensors, and energy-efficient equipment, building owners can enhance comfort, meet code requirements, and enjoy long-term financial benefits while reducing their carbon footprint.

Wireless Products Offered by Functional Devices, Inc.

Functional Devices, Inc., manufactures EnOcean wireless products that can make these energy-saving applications a reality. These wireless products can offer a lower entry cost than a wired solution since a substantial portion of the cost for such projects is running power and signaling conductors. The following are common applications for which we receive requests and technical support questions.

Occupancy Based Lighting Control

Problem: Leaving lights on in an unoccupied office or meeting room can be a big waste of electricity. No one remembers to turn them off every time.

Solution: Our EnOcean wireless Lighting products can pair with an occupancy sensor to control lighting in two different modes.

The first mode, Auto ON, allows control of the lighting by the sensor alone. When occupancy detection occurs, the lighting load turns ON and remains ON until thirty minutes after the last motion detection. The other mode, Manual ON-Auto OFF, allows a wireless rocker switch to also link to the control device. In this mode, the rocker switch can control the ON/OFF function of the light load. The occupancy sensor will turn the lighting load OFF thirty minutes after the last motion detection. The table below lists our EnOcean wireless lighting products that work for the above application. The EnOcean Equipment Profiles (EEP) are in the last column of the table.

Functional Devices, Inc. Wireless Lighting Products

Controlling Hotel Room HVAC

Problem: Another application that I am receiving more frequent inquiries about is hotel room energy management. The concern is that a guest would unknowingly leave a hotel room window or patio door open while the HVAC is running and leave the room. This would, at the least, waste energy, and at the worst, potentially damage the HVAC system.

Solution: Fortunately, we have a solution using an EnOcean enabled RIB® relay and one or more wireless door/window sensors (WDWS2-EN3). When linked with any of our EnOcean relay devices, the door/window sensor sends a CLOSE command when the window or door closes and an OPEN command when the window or door opens.

This application can also utilize our product's Alarm Mode and/or Delay Mode. The Alarm Mode allows multiple sensors to control one device. In this mode, all linked sensors would need to send a CLOSE command for the load to turn ON. The delay mode adds a ten second delay before the relay will turn ON and a ninety second delay before the relay will turn OFF. The ninety second delay allows door/window sensors to temporarily open and close without affecting the load, and it will prevent the HVAC unit from short cycling. The image below shows a hotel room utilizing our EnOcean products for maximum energy savings.

Controlling Hotel Room Lighting

Problem: Another waste of energy in a hotel room is lights left on when the room is unoccupied.

Solution: To prevent this, use a keycard switch, like our WKC-EN3, in the room instead of a traditional light switch.

The keycard switch links to one of our EnOcean relays controlling the room lighting and paired in Momentary mode. With this setup, the patron's hotel room keycard would have to insert into the keycard switch for the lights to turn ON. Upon removal of the keycard, as the patron exits, the lighting would turn OFF. The table below shows our EnOcean wireless products used in the two previous applications.

Functional Devices, Inc. Wireless BAS Products

If you are interested in learning more about these applications or products, review the Application Manual available on our website, or call or email our technical support team.

About Functional Devices, Inc.

Confidence and Peace of Mind in Every Box

At Functional Devices, Inc., we have been designing and manufacturing high-quality electronic components in the USA since 1969. Our mission is simple: to enhance lives in buildings and beyond by delivering reliable, innovative solutions for the building automation industry. Our product lineup includes RIB® relays, current sensors, power controls, power supplies, transformers, lighting controls, and more—each designed to meet the highest industry standards.

We test 100% of our assembled products, ensuring an exceptionally low failure rate—less than 1 in 16,000 in the field. This commitment to excellence means you get products that perform reliably, reducing downtime and increasing efficiency. With every Functional Devices product, you receive more than just a component—you gain confidence and peace of mind knowing your systems are built on trusted, field-proven technology.