There are different control options that you can choose; when set to "Smart" mode, the SmartPlug monitors and records the home's hot water usage pattern over a 7 day period. The SmartPlug will use the preceding week's usage pattern to automatically cycle the circulator ON, so hot water is always available when it's needed. The recording and repeating process is continuous, week after week. When set to "Pulse" mode, the SmartPlug will continuously cycle the circulator ON for 5 minutes, then OFF for 10 minutes to maintain hot water at all fixtures. There is also a vacation mode, when after 36 hours of no hot water usage, the smartPlug will automatically turn the circulator OFF and remain off until hot water usage is detected. While in vacation mode the SmartPlug will cycle the circulator for 10 seconds every 7 days to prevent any corrosion or scale build up
The Taco SmartPlug Instant Hot Water Control does not have temperature set point. It adds intelligence to your system by learning when hot water is used in the home. The pipe-mounted temperature sensor will detect an increase in water temperature and then records daily hot water usage patterns during the course of a week. Hot water is always available when it's needed and if usage patterns change, the SmartPlug adjusts automatically. For more information on its functions, please read into the product overview: http://s3.supplyhouse.com/product_files/Taco-SP115-1-Product-Overview.pdf
The Taco SmartPlug Instant Hot Water Control does not have any temperature set point nor does it directly adjust the temperature within the system. Simply connect the SmartPlug to any 110V power outlet then plug the circulator power cord into the SmartPlug. Using a sensor that mounts to the hot water supply pipe, the SmartPlug will record the daily hot water usage pattern in a home and adjust the circulator run time automatically. Hot water will always be available when needed.
The return line temp is determined by the amount of heat loss occurred during the process of your hot water moving through the building and returning to the mechanical room. It will vary from site to site. The temp sensor allows the controller to measure the outgoing water temp which determines when and how long the hot water is turned on for. The controller then sets up the times to run based on prior usage.