Bell & Gossett Residential Controls – ZoneTrol™ II

Optional Features (4 and 6 zone controllers only)

  • Boiler Reset: Incorporates a pre-wired integral boiler reset controller into the ZoneTrol II enclosure. Reset controller cycles the burner to maintain the optimum system supply temperature relative to the outdoor air temperature. Warm weather shutdown functionality can be activated to prevent system operation above a user-selectable outdoor temperature threshold. All necessary sensors are included.
  • Mixing Reset: For use on hydronic systems incorporating a variable speed injection pump. Incorporates a pre-wired integral mixing reset controller into the ZoneTrol II enclosure. Mixing Reset controller varies the speed of the injection pump to maintain optimum radiant loop temperature relative to the outdoor air temperature. The boiler return temperature is also monitored to ensure that the appropriate minimum water temperature is not violated. Warm weather shutdown functionality can be activated to prevent system operation above a user-selectable outdoor temperature threshold. All necessary sensors are included.