9/18/2023 0 Comments Carrier manual outside air damper![]() ![]() Let’s assume you run the numbers against ASHRAE Standard 62.1, and determine that a 5,000 CFM ( 12.5 Ton Unit – See “ HVAC Tonnage Simplified, Explained, And Defined! ” to better understand the conversion) RTU requires 20% (1000 CFM) of outside fresh air when a building is occupied. Closing the damper prevents outside air from entering the Rooftop Unit (RTU) under less than favorable outside air conditions, reducing the amount of time the RTU is operational, saving energy! During any segment of a day designated as “Unoccupied,” you are permitted to completely close an economizer’s outside air damper blades, preventing outside air from entering into a building (This does not apply under Free Cooling Conditions). Why? Let me explain!įor a better understanding of economizers - What Is An Economizer – AKA Mixing Box? Economizers Class 101!!ĪSHRAE provides standards which allow us to calculate the minimal quantity of fresh air an economizer must introduce into a building under “Occupied” conditions. However, they don’t tell us where to physically position the damper blades as to achieve a specific CFM of fresh outside air. What is, And How To Determine Economizer Minimum PositionĮconomizer instructions explain how to set, and adjust the minimum open position for outside air dampers via a controller. ![]()
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