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Trane Air Handler AHU with Electric Duct Heater
Trane Air Handler AHU Electric Duct Heater - This Trane air handling unit photo shows a Trane AHU with an electric duct heater above the Trane air handler in the supply duct. In places where natural gas is not available and propane LP gas is impractical or not wanted. Electric heat makes a good source of heating. This electric duct heater is situated on the supply side of the air handler. Furthermore, many duct heaters are installed inside the air handler.
Trane Air Handler AHU Electric Duct Heater
In all situations when duct heaters are used the heater will not energize until airflow is proven. An airflow proving switch is usually used to prove there is airflow. Airflow through the duct before the electric heaters can energize. Airflow proving switches can be used for either electric heaters or gas-fired heaters. The airflow proving switch, in this case, is nothing more than a pressure switch. A differential pressure switch across the ductwork. The pressure switch reads a negative on one side of the duct heater and a positive on the other side of the duct heater. That pressure causes a bellows switch inside the pressure switch to close and allows the duct heater to energize.
Trane Air Handler AHU Electric Duct Heater
AHU’s move air throughout a duct system to provide conditioned air in a space for either heating or cooling. AHU’s can found in closets, attics, or under the floor in some cases. The entire HVAC system should be designed for a specific load. The load is based on Manual J for residential and Manual N for commercial. Systems are designed by engineers or by Master HVAC tradesmen with years of experience. The initial design begins with a load calculation based on the types of materials used in construction. Additionally, it includes the number of windows and doors. Furthermore, using this information a good system can be designed for the structure.
Trane Air Handler AHU Electric Duct Heater
Technical Resource: Refrigeration and Air Conditioning Technology
