T855 Programmable Digital Thermostat

Product Description

A sleek and user-friendly thermostat from the T800 Series by Pro1, this 7 day programmable model is electric or gas configurable, controlling both heating and cooling set point limits via an extra large, easy-to-read temperature display for precise and affordable comfort control.

Boasting an 8 sq. inch display with a flattering blue black-light and a glow-in-the-light button for added ease of use, this digital thermostat makes room temperature calibration and separate heating and cooling swing adjustment a breeze. Its easy menu-driven programming features intuitive wake, leave, return and sleep programming icons, working on a 7 day or 5/1/1 day schedule to suit your needs.

Other key features of this model include three heating and two cooling fan stages, auto changeover, 5 minute compressor delay protection, keypad lockout, a filter change indicator, easy wire color coded terminal blocks and a universal sub-base. This unit mounts on a wall or junction box and can be powered with batteries or a 24 volt power source.

Quick Specs

  • 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)
  • 4.7″W x 4.4″H x 1.1″D


Weight 2 lbs
Dimensions 6 × 6 × 6 in
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


4.7″W x 4.4″H x 1.1″D

Wi-Fi Module

Supporting 802.11 B/G/N Standards


2.4 GHz ISM radio band