📷 RTU System Diagram

 

Figure 1: Basic RTU layout showing supply/return air, compressors, and heat exchangers.

 

🧰 What is a Rooftop Unit?

A Rooftop Unit (RTU)—self-contained is a packaged HVAC systemssystem installed on buildingthe rooftops.roof RTUsof are widely used ina commercial settingsbuilding. likeIt retail stores, offices, and schools due to their compact footprint and all-in-onecombines heating, cooling, ventilation, and ventilationair design.distribution into a single cabinet, making it ideal for spaces that lack mechanical rooms.

ReadersRTUs willcondition learn:air and deliver it through ductwork connected from the roof to interior zones.

Used in:

• HowRetail RTUs operate and distribute conditioned airstores

• Key components: compressors, heat exchangers, supply/exhaust fans, economizersSchools

• TypicalOffice capacities, voltages, and airflow configurationsbuildings

• Curb installation requirementsGyms and crane considerationswarehouses

🔧 Key Components

🔹 Cabinet

• MaintenanceWeatherproof housing for all major components

🔹 Supply & Return Fans

• Drive airflow through the building’s ductwork

🔹 Compressor & Refrigeration Circuit

• Provides cooling via a refrigerant cycle

🔹 Gas Furnace or Electric Heat Section

• Provides space heating

🔹 Economizer (Optional)

• Allows use of outside air for “free cooling”

🔹 Filters & Dampers

• Clean air and servicecontrol access best practicesintake/exhaust

 

Figure:Figure Diagram of2: RTU withmaintenance airflow path and key internal componentsaccess.

 

📏 Typical Specs

• DesignedTonnage Range: 3 to 60 tons

• Voltage: 208/230V, 460V 3-phase

• Mounting: Roof curb or rail

• Airflow: Side or bottom discharge/return

🧱 Installation Considerations

 

Figure 3: RTU being installed on curb via crane lift.

 

• Requires roof curb and structural reinforcement

• Duct cutouts must match RTU supply/return layout

• Condensate drain and electrical connections needed

• Consider local code compliance (curb height, seismic, clearance)

🧼 Maintenance Requirements