WiFi Thermostat, 7 Day Programmable, Stages 4 Heat/2 Cool, 24V

Pro1 T855iSH Thermostat – Programmable Control for Multi-Stage HVAC Applications

The Pro1 T855iSH is a 7-day programmable thermostat designed for use with up to 4 heat and 2 cool stages for heat pump systems, or 2 heat and 2 cool conventional systems. It supports automatic changeover, configurable system type, and advanced installation settings for professional HVAC applications.

System Capabilities and Application

• System Type: Compatible with 4 Heat / 2 Cool heat pump or 2 Heat / 2 Cool conventional systems
• Programming: 7-day programmable with independent schedules per day
• Changeover: Auto or manual changeover between heating and cooling modes
• Mounting: Designed for wall mounting or standard junction box configuration

Functional Features

• Display: Large 8-square inch screen with blue backlight for enhanced visibility
• User Interface: Menu-driven navigation with programmable icons for wake, leave, return, and sleep
• Compressor Protection: Built-in 5-minute delay to prevent short cycling
• Swing Adjustment: Adjustable heating and cooling differential (0.2°F to 2.0°F)
• Calibration: Room temperature calibration adjustment supported
• Keypad Lockout: Restricts user access to settings in secure environments
• Filter Reminder: On-screen indicator for filter replacement intervals
• System Configuration: Compatible with electric and gas systems

Technical Specifications

• Voltage: 24VAC
• Power Source: Hardwired or battery-powered (2 x AA)
• Display Range: 41°F to 95°F
• Load Rating: 1.0 amp per terminal, 1.5 amp maximum across all terminals

Installation Guidance

The T855iSH is designed with contractors in mind, featuring a universal subbase, color-coded terminal blocks, and clearly labeled interface components. Installation requires standard tools and low-voltage wiring knowledge. For optimal system performance and code compliance, professional installation is recommended.

Contractor Use Case

Designed for multi-stage HVAC systems in residential and light commercial installations, the T855iSH allows for precise scheduling, lockable settings, and remote configuration (when paired with optional modules). Ideal for new construction, retrofits, and system upgrades requiring programmable performance with a large display interface.

Feature Summary

• Programmable Schedules: 7-day configuration with 4 daily events
• System Protection: Delay logic and lockout settings for equipment safety
• Interface Security: Keypad lockout prevents unintended changes
• Installation Flexibility: Junction box or wall mount support
• Filter Change Reminder: Tracks runtime and displays alerts