SZVAV - Cool
When there is a space cooling demand, DX cooling will initialize and increase to satisfy space
temperature. The supply fan will continue to operate at a low, fixed speed at low cooling capacities until
the cooling capacity requires additional airflow to keep the compressor operation optimal. The supply fan
speed will increase as the demand for cooling capacity increases. The minimum supply fan speed is
calculated by DX cooling capacity. As the space requires additional cooling capacity, Space Temperature Control will calculate a lower discharge air temperature setpoint increasing DX cooling which in turn increases the supply fan speed. Cooling capacity and supply fan speed both can increase to 100%.
If the unit discharge air temperature reduces to the Discharge Air Temperature Minimum Cool Limit
setting or DX cooling reaches 100% capacity, cooling capacity increases will hold while the supply fan
speed will continue to increase to 100% or modulate to manage space comfort cooling.
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WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.