The term “AHU circuit” doesn’t have a universally standardized meaning in the HVAC industry. However, based on the context of air handling units (AHU), there are two possible interpretations:
- Electrical Circuit for an AHU:
This refers to the electrical wiring and components that supply power to the AHU and its various components. An AHU circuit would typically include:
- Breaker or fuse: Protects the circuit from overload.
- Disconnecting switch: Allows for safe isolation of the AHU for maintenance or repairs.
- Power supply wires: Provide electricity to the AHU components like the fan motor, compressor (if applicable), control boards, and actuators.
- Control wiring: Carries low-voltage signals for communication between thermostats, sensors, and the AHU’s control system.
- Airflow Circuit Within an AHU:
In a broader sense, “AHU circuit” could be a less common way to refer to the pathway that air takes within the AHU itself. This airflow circuit would typically involve:
- Intake: Where outside air or return air enters the AHU.
- Filters: Air filters remove dust, contaminants, and allergens from the air stream.
- Heating/Cooling Coils: Heating coils (e.g., gas-fired or electric) or cooling coils (using refrigerant) adjust the air temperature as needed.
- Humidifier (optional): Adds moisture to the air if required.
- Dehumidifier (optional): Removes moisture from the air if needed.
- Fan: The fan pulls air through the AHU and pressurizes it for distribution through the ductwork system.
- Discharge: The conditioned air exits the AHU and is delivered to the building through ductwork.
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