Rooftop Units (RTUs), also known as packaged units, are an integral part of many commercial HVAC systems. In this blog post, we share best practices to help HVAC professionals maximize RTUs’ efficiency and longevity and draw on expert insights from John Molnar, Commercial Sales Manager at ECCO Supply.

What is an RTU?

An RTU, or Rooftop Unit, is a type of HVAC system where all components are packaged together in one cabinet, typically installed on the roof of a building. This setup saves indoor space and simplifies maintenance by keeping the unit accessible from the roof. RTUs are used to heat and cool the air in commercial spaces, making them a popular choice for businesses looking to optimize their HVAC systems.

RTU efficiency

Recent advancements in RTU technology have significantly improved energy efficiency. Smart controls and automation allow for more precise temperature regulation. At the same time, variable speed drives (VSDs) enable RTUs to adjust their speed based on the building’s demand, reducing energy consumption and operational costs. These technologies optimize the unit’s performance by matching the actual load rather than running at full capacity all the time.

Molnar refers to smart controls and VSDs as game changers for RTUs: “They help optimize performance by ensuring the unit operates only at the capacity needed, which can lead to substantial energy savings.”

Maintenance and monitoring

Dirty filters, refrigerant leaks, and worn-out belts are common maintenance issues with RTUs. Regular inspections and maintenance, including changing filters, checking for leaks, and replacing worn parts, can prevent most of these problems.

“Scheduled maintenance is crucial. Regularly changing filters and checking for refrigerant leaks can prevent many common issues and ensure the RTU operates efficiently,” says Molnar.

Integrating the Internet of Things (IoT) and remote diagnostics in RTUs has revolutionized maintenance and monitoring. Real-time monitoring and data analysis can predict potential issues before they become major problems, enabling HVAC professionals to perform preventive maintenance and make data-driven decisions. Molnar says this predictive maintenance approach can significantly improve the reliability and lifespan of RTUs.

Maximizing RTU longevity

Proper installation is crucial for the longevity and performance of RTUs. Incorrect installation can lead to poor airflow, inefficiency, and even system failure. Ensuring the unit is properly sized and installed according to manufacturer guidelines is essential. Environmental factors, such as exposure to extreme weather conditions, debris, and UV radiation, can also impact the performance and lifespan of RTUs. Protective measures, such as weatherproofing and regular cleaning, can mitigate these effects.

RTUs interact with other HVAC components, making system integration important. Managing load distribution to prevent overworking RTUs and conducting energy audits to identify inefficiencies can significantly enhance system performance. Retrofitting existing RTUs with newer components can also improve performance and extend the unit’s life.

As the HVAC industry evolves, low-GWP refrigerants will impact RTUs. Visit our blog often to stay informed.