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PRO 1 – T855i Universal WIFI Thermostat


Universal – WIFI
Residential/Light Commercial
Up to 2 Heat, 2 Cool Conventional
Up to 4 Heat, 2 Cool Heat Pump
Hardwire Only
7 Day, 5/1/1 or Non-Programmable





  • 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
  • Mounts on wall or junction box
  • 24v power
SKU: 5678 Category:


The display range of temperature
41˚F to 95˚F (5˚C to 35˚C)
The control temperature range
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)
Hardwire Only
Operating ambient
32° to +105° (O° to + 41°C)
Operating humidity
90% non-condensing maximum
Dimensions of thermostat
4.7″W x 4.4″H x 1.1″D




pro 1800-Family-Brochures-1644



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