The ''SAS'' supply air sensor allows precise real time monitoring of the supply air temperature on your zoned HVAC system. The SAS wires directly into the BMPlus, NCM300, EWC-300, UZC4 and UT3000 series control panels and senses the supply air temperature in both heating and cooling modes. Using the adjustable potentiometers or LCD menu on the control panel, the installer can set the desired temperature limit set-points on most EWC zoned HVAC systems. This will protect the HVAC equipment from excessive temperature rise or fall during heating and cooling operations. EWC recommends mounting the SAS in the supply air plenum, approximately 6 to 12 in downstream of the heat exchanger or DX coil. Upstream of the electric strip heating elements in heat pump applications. It should also be installed upstream of any bypass duct connection. Some EWC control panels have dual high limit potentiometers which allows mounting the SAS in the discharge plenum, regardless of the DX coil and/or heat exchanger or strip heat configuration. Make sure you enable the SAS Dip switch on some panels. Now adjust the heating and cooling limit set-points or Under/Over temperature Off-set values for your particular application on the Ultra-Zone control panel and enjoy real time monitoring of the HVAC supply air temperature in heating and cooling modes.