TAC Xenta 121-HP is an easily programmable controller intended for heat pumps, with or without re-heat. It can be configured for use with 1, 2, or 3 compressor heat pumps and for a multitude of re-heat types, such as electrical and gas heaters. The controller has different types of fan control and advanced fan control functions, including on/off delays, boosting and conditioning. The sequences for cooling, heating and fan are completely user programmable, allowing for numerous applications. For energy savings the controller has built-in economizer functionality. Use TAC Xenta 121-HP with any TAC STR (1.8 kohm) room unit.