Sizing Roof Top Units

Combining industry leading efficiency with fast easy installation and service lennox continues to offer reliable systems that deliver exceptional comfort in commercial buildings.

Sizing roof top units.

Lennox packaged rooftop units represent some of the most innovative technology in the market. Most rooftop unit manufacturers provide tables or computer programs to help engineers select units. The purpose of a rooftop unit is to distribute conditioned air within define areas of a building. 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. A btu or british thermal unit is the amount of heat needed to heat 1 pound of water one degree fahrenheit. Though btus are important most larger air conditioning units are rated in tons. Purpose of a rooftop unit.

Since 12 000 btus equal 1 ton an air conditioning unit rated at 3 tons can produce. Rooftop units in the 5 pro core 20 and 40 series are smart equipment enabled or smart equipment optional. Select johnson controls rooftop units are smart equipment enabled meaning they already have controls embedded and can seamlessly connect to a controls system and self discover other smart equipment. The btu measurement describes the size of the unit or units in tons.

Besides meeting the space cooling load sensible plus latent the unit must cool outside air and overcome fan heat.