Sizing Roof Top Units

The carrier weatherexpert packaged rooftop unit series provides comfort and energy efficiency never seen before.

Sizing roof top units.

The btu measurement describes the size of the unit or units in tons. Though btus are important most larger air conditioning units are rated in tons. Rooftop units are connected to ductwork which provides a defined route for the conditioned air to travel along. Now in our last tutorial we looked at air handling units or ahu s.

What size rooftop unit will meet the load and deliver the desired supply air temperature. Combining industry leading efficiency with fast easy installation and service lennox continues to offer reliable systems that deliver exceptional comfort in commercial buildings. Besides meeting the space cooling load sensible plus latent the unit must cool outside air and overcome fan heat. The purpose of a rooftop unit is to distribute conditioned air within define areas of a building.

Purpose of a rooftop unit. Most rooftop unit manufacturers provide tables or computer programs to help engineers select units. Lennox packaged rooftop units represent some of the most innovative technology in the market. Weatherexpert units available in 3 23 ton sizes use multi stage compressors a single refrigerant circuit and sav staged air volume logic to provide part load efficiencies that lead the industry.

A btu or british thermal unit is the amount of heat needed to heat 1 pound of water one degree fahrenheit.