T6861 digital thermostats are designed for application of 3-speed fan and valves in fan coil system. Including: 2-pipe cool only/heat only/manual changeover Ventilation mode Manual or automatic 3-speed fan control Water valve control Fan speed can be selected to automatic or manual 3-speed control mode. In ventilation mode, fan only support manual speed control. Features: Super modern appearance design, suitable for office, hotel and residential building Horizontal and vertical model available for variant application Slim design, direct installation on 3" x 3" size box Stylish and elegant blue/green backlight with blue/ green/ white colour ring Big LCD display with English and icons Easy to install and set-up Time on/off function Selectable room temperature or setpoint display Manual or automatic fan speed selection Energy saving mode activation by button press or dry contact (key card) Cycle per Hour (CPH) function Adjustment of display room temperature Temperature unit either  °C or °F User setting can be kept when power off Freezing protection function available Lock or unlock keys or part of keys in Installer Setup Heat and cool setpoint limitation for energy saving