> Building Automation > Vista > TAC Xenta 121-HP Programmable Heat Pump Application 
The sequences for cooling, heating and fan are completely user programmable,allowing for numerous different applications. For energy savings,the controller has built-in economizer functionality. Use TAC Xenta 121-HP with any TAC STR room unit. Set-up is done using the programming tool TAC ZBuilder, which can be run stand-alone or as a device plug-in to either TAC Vista or LonMaker®. The configuration settings are downloaded into a TAC Xenta 100, prepared with the necessary basic application software. The controller is a LONMARK® compliant device aimed at communicating on a LonTalk® TP/FT-10 channel. It is able to operate both as a stand-alone device and as part of a system. In- and output network variables can be monitored via the TAC Xenta OP.
