What is RTU (Rooftop Unit)?
A packaged HVAC system that combines heating and cooling equipment in one unit, typically installed on a roof and supplies conditioned air through ductwork.
Definition
Purpose
RTUs provide heating, cooling, and air distribution from a single packaged system. Combining these functions in one unit reduces the space needed for separate HVAC equipment and can simplify installation, maintenance and diagnostics.
Because RTUs are typically installed outdoors on rooftops, they also keep major HVAC equipment out of occupied interior spaces while allowing conditioned air to be distributed through ductwork.
Examples of Use
- Commercial HVAC: RTUs, including Trane rooftop units, are commonly used to provide heating and cooling for offices, retail spaces, warehouses, and other commercial buildings.
- Supply and Return Air: The unit connects to interior supply and return ductwork to circulate conditioned air throughout the building.
- Outside Air: An economizer or outside-air intake can bring outdoor air into the HVAC system for ventilation and, when conditions allow, cooling.
- Heating: A furnace or other heat source within the RTU provides heating during colder conditions.
- Cooling: Components such as the compressor, condenser, and evaporator work together to provide air conditioning.
Related Terms
Notes
- RTUs combine heating and cooling equipment into a single packaged assembly.
- They are typically installed on rooftops but can also be installed at ground level and ducted through a building wall.
- Common RTU components include an evaporator, condenser, compressor, blower motor and fan, cooling fan, economizer, heat source, and exhaust flue.
- RTUs generally require electrical connections, duct connections, and, where applicable, gas supply piping.
- Rooftop installation saves interior floor space but can make equipment access and maintenance more difficult.
- RTU takeoffs may include equipment counts, unit sizes, duct connections, accessories, curbs, and associated electrical or gas connections.
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