CCPIA Articles - Certified Commercial Property Inspectors Association

Commercial Rooftop Unit (RTU) Basics

The RTU is the most widely used commercial heating and the cooling unit found in the U.S. The rooftop unit is sometimes called a package unit, as all its components are contained in one unit. The RTU is usually a direct-expansion (DX) unitary system, which means that the air is cooled by a refrigerant, and…

CCPIA Articles - Certified Commercial Property Inspectors Association

Central Plant Systems and Chilled Water Systems

Central plant systems typically consist of components to provide chilled water for cooling, and use a boiler for heating water. Boilers typically operate at 17º F to 200º F, although most units that are manufactured currently are computer-controlled and may operate at as low as 100º F, depending on the exterior temperatures and the heat…