TSD1622 is a SSAC Time Switch (TS) module used to provide control of an electrical load based on time or temperature settings. It can be programmed with up to 40 control scenarios, allowing for flexible and precise control of electricity usage. It is commonly used in residential and commercial buildings to control lights, heating, ventilation, and air conditioning (HVAC) systems. The TSD1622 has two inputs – one for temperature and one for time – and two separate outputs – one electrical and one opto-isolator. With this wide range of features, the TSD1622 is an ideal choice for those looking to effectively manage energy usage in buildings.