Digital Controller for Accurate Zone Comfort 
The T158 microprocessor-controlled thermostat is a stand-alone digital controller that supplies 24 VAC output control for valves, dampers, relays and three-wire floating valves. The use of an advanced proportional integral (PI) algorithm allows precise control of zone comfort under varying operational and environmental conditions. 

Adjustable for Application Requirements
The digital display, with easy-to-use adjustment buttons, allows convenient access to current zone temperature, setpoint temperature and operating mode. Optional pipe sensor changeover, setback and auxiliary heat functions are available,on selected models, for adapting to application requirements.