No, you cannot send direct current (DC) through an alternating current (AC) capacitor typically used in HVAC systems. AC capacitors are designed to work with alternating current, which means they are optimized to store and release electrical energy in synchronization with the changing direction of the AC waveform.
If you were to apply DC voltage to an AC capacitor, it would not function as intended. AC capacitors are usually made up of two conductive plates separated by an insulating material (dielectric). The dielectric material used in AC capacitors is specifically chosen to have certain characteristics that allow it to handle AC voltages.
When DC voltage is applied to an AC capacitor, the dielectric can break down due to the continuous voltage in one direction. This can lead to insulation failure, internal heating, and potentially damage the capacitor. In extreme cases, it can even cause the capacitor to explode or release harmful gases.
Therefore, it's important to use the appropriate type of capacitor for the specific application. If you need to work with DC voltage, it is recommended to use a capacitor specifically designed for DC circuits.