PRO1 IAQ WIFI Universal Programmable Thermostat T855i

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The universal T855i connected thermostat will work on almost any system. Whether it's a multi-stage system, light commercial building, or homeowner who wants auto changeover and a large display, T855i is a great choice.


  • 7 Day or 5/1/1 progammable
  • Auto Changeover
  • Easy menu driven programming
  • Intuitive wake, leave, return, sleep programming icons
  • 8 sq. inch display
  • Blue backlight
  • Glow in the dark light button
  • Programmable fan
  • Electric or Gas configurable
  • Room temperature calibration adjustment
  • Separate heating and cooling swing (cycle rate) adjustments
  • Keypad lockout
  • Heating and cooling setpoint limits
  • 5 minute compressor delay protection (selectable on or off)
  • Filter change indicator(selectable on or off)
  • Simple private label badge system
  • Easy wire color coded terminal blocks
  • Universal sub-base M
  • ounts on wall or junction box
  • 24v power


  • Display range of temperature 41°F to 95°F (5°C to 35°C)
  • Control range of temperature 44°F to 90°F (7°C to 32°C)
  • Load rating 1 amp per terminal, 1.5 amp maximum all terminals combined
  • Display accuracy ± 1 °F
  • Swing (cycle rate or differential)
    Heating is adjustable from 0.2°F to 2.0°F
    Cooling is adjustable from 0.2°F to 2.0°F
  • Power source 18 to 30 VAC, NEC Class II, 50/60 Hz for hardwire (common wire)
  • Operating ambient 32° to +105° (O° to + 41°C)
  • Operating humidity 90% non-condensing maximum
  • Dimensions 4.7"W x 4.4"H x 1.1"D
  • Wi-Fi Module Supporting 802.11 B/G/N Standards
  • Frequency 2.4 GHz ISM radio band