Johnson Controls A350BB-1 SPDT Electronic Temperature Control 3455C 24V

The Johnson Controls A350BB-1 SPDT Electronic Temperature Control 3455C 24V is an electronic device that helps to maintain a certain temperature in HVAC devices. It operates by deducing from the surrounding temperature, through an electronic system, a signal is sent either to switch on the heating or cooling machinery such as furnaces, air conditioners and heat pumps depending on what has been preset. This electronic temperature control circuit employs an SPDT, relay to encompass a circuit path in two dissimilar manners. With respect to sensing temperatures that has gone high or low beyond the control range (-34°C to 55°C), the control switches on the relay which in turn switches on the right equipments so as to regulate the temperature.