Honeywell XE111 Series
The T6571 Digital Thermostats are designed to provide Proportional-Integral (PI) modulating control in zoned commercial Heating, Ventilating, and Air Conditioning systems such as hydronic heating and/or cooling, pressure dependent VAV or by-pass box with or without terminal reheat.
The T6571 family provides modulating analog 4 to 20 mA or 2 to 10 Vdc control. Other available features include energy savings card key input, auto-detection of temperature sensor
(remote sensor or internal sensor), and optional Celsius or Fahrenheit operation.
Heat/Cool models are available with constant fan operation. Models are available with either a three-speed fan selector switch with low, medium and high settings, or one-speed only.
On models with system on/off switch, the fan can be powered off.