Residential/Light Commercial Thermostat, Up to 2 Heat, 2 Cool Conventional, Up to 3 Heat, 2 Cool Heat Pump

Pro1 T855 Thermostat – 7-Day Programmable Control for Multi-Stage HVAC Systems

The Pro1 T855 is a 7-day programmable thermostat designed for multi-stage conventional or heat pump systems. Suitable for residential and light commercial applications, it supports up to 2 heat/2 cool conventional or 3 heat/2 cool heat pump configurations. The T855 includes advanced control features while maintaining a streamlined interface for straightforward operation and installation.

Product Features

• System Support: Controls up to 2H/2C conventional or 3H/2C heat pump systems
• Scheduling: 7-day independent programming with up to four time periods per day
• Swing Settings: Adjustable heating and cooling differential from 0.2°F to 2.0°F
• Backlit Display: Large blue backlight LCD for visibility in all lighting conditions
• WiFi Ready: Optional Pro1 WiFi module available for remote management (sold separately)
• Power Supply: Dual-powered by 24VAC (hardwired) or batteries
• Terminal Load Rating: 1 amp per terminal; 1.5 amps total maximum

Technical Specifications

• Temperature Display Range: 41°F to 95°F
• Operating Temperature: 32°F to 105°F ambient
• Dimensions: 4.7" W x 3.6" H x 1.1" D (approx.)
• Mounting: Universal subbase, wall or J-box installation
• Power Options: Battery-only, hardwired, or dual power

Installation Notes

The T855 thermostat includes a universal mounting base designed for compatibility with a range of HVAC system types. Clearly labeled terminals assist in minimizing wiring errors. For heat pump systems or multi-stage equipment, it is recommended that a licensed HVAC technician perform the installation to ensure compatibility and correct system setup.

Contractor Considerations

• Supports system configurations commonly used in residential and light commercial HVAC setups
• Designed with professional installers in mind; interface simplifies configuration and reduces callback potential
• Integrated compressor short cycle protection to enhance system reliability
• System mode and fan mode switches allow manual override without entering menus

Functionality Overview

• Manual or Programmable Modes: User can switch between programmable scheduling and hold mode
• WiFi Upgrade Capability: Optional wireless module supports remote monitoring and scheduling
• Filter Change Indicator: Built-in reminder can be set to notify after a set number of runtime hours
• Keypad Lockout: Installer-accessible lockout prevents unauthorized changes

Application Suitability

The Pro1 T855 thermostat is best suited for contractors servicing clients who require flexible scheduling and multi-stage compatibility. Its programming and differential settings make it appropriate for optimizing equipment efficiency and indoor comfort in both standard and variable weather conditions.