The most common diagnosis with expansion valves is failed closed or restricted, resulting in underfeeding of the evaporator. The symptoms are low suction, normal subcooling, and high superheat when a TXV fails “shut,” but there are some other issues to watch for that can actually result in overfeeding the coil. Schrader in the Port The […]

In a series circuit (loads connected in a row end to end), it's easy to calculate total circuit resistance because you simply add up all the resistances to get the total. In a parallel circuit, the voltage is the same across all the loads; the amperage is simply added up, but the resistance is a […]

  Image Courtesy of Eaton SNAP ‘N SHIELD Piping support is covered in Section 305 of the IMC (International Mechanical Code). Once again, the IMC isn't binding, but it is what most local codes are based on. Piping / Tubing Material Maximum Horizontal Distance Between Support Maximum Vertical Distance Between Support Copper Tubing 1 1/4″ […]