HVAC: TRANE RTU Not Heating (Controls Upgrade And Troubleshooting/Diagnostics) Trane Voyager Series

Описание: In HVAC, RTU stands for Rooftop Unit, a self-contained, packaged system that provides heating, ventilation, and air conditioning (HVAC) for commercial buildings, housing all components like the compressor, condenser, evaporator, and air handler in one box, usually on the roof to save interior space and use ductwork for air distribution. They are popular for retail, office, and school buildings for their integrated design, simplifying installation and maintenance compared to larger, custom systems.

The RTU is usually a direct-expansion unitary system, which means that the air is cooled by a refrigerant, and can be either fan-cooled or water-cooled. Heat can be produced by gas, electric, or water. How an RTU works is first, air returns back to the packaged rooftop unit from the space the unit is ventilating. Some units also mix outdoor air with the returning air to produce fresher air for the space. The air then moves through the filters. Then it continues to the evaporator coil which chills air by running it over refrigerant in the coil. The air then flows through a blower, leaving it conditioned and ready for the space. Some units have small heating elements near the blower to further adjust the air’s humidity. There is usually a clear, insulated divide between the evaporator coils that cool the return air, and the condenser coils and compressor that eject heat to the atmosphere. A basic thermostat typically controls packaged rooftop units. However, depending on the application they can be a part of a more complex control system.

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