T721 Digital Non-Programmable, Multi-Stage Thermostat w/ Heat Pump (2H/1C)

The Pro1 IAQ T721 is a digital non-programmable thermostat designed for multi-stage heat pump systems with 2-stage heating and 1-stage cooling capability. This thermostat delivers precise temperature control for heat pump installations through dedicated B and O terminals, separate heating and cooling swing adjustments, and configurable settings for electric or gas systems. Built for contractors and homeowners who need reliable heat pump climate control without the complexity of programming, the T721 combines a 4 square inch backlit display with straightforward push-button operation. The unit mounts on either a wall or junction box and operates on battery or 24V power, making it adaptable to a wide range of installation scenarios.

• 4 Square Inch Backlit Display: The large digital screen with blue backlight provides clear temperature readouts in any lighting condition, making it easy to check and adjust settings from across the room.
• Dual Power Options: This thermostat runs on either battery or 24V hardwired power, giving you installation flexibility and ensuring operation continues during brief power interruptions when battery-powered.
• Heat Pump Optimized Design: Separate B and O terminals allow proper configuration for heat pump reversing valve control, ensuring your system switches correctly between heating and cooling modes.
• Independent Stage Adjustments: Separate heating and cooling swing (cycle rate) adjustments, including dedicated 2nd stage adjustments, let you fine-tune comfort and system efficiency for each operating mode.
• Glow-in-the-Dark Light Button: The illuminated control button remains visible in darkness, allowing easy nighttime adjustments without searching for switches.
• Easy Access Battery Compartment: The battery bay opens without tools or wall removal, making routine battery replacement quick and simple during service calls or seasonal maintenance.
• 5 Minute Compressor Delay Protection: Selectable compressor short-cycle protection prevents premature equipment wear by enforcing a minimum time between compressor starts.
• Filter Change Indicator: The selectable filter reminder alerts you when it's time for HVAC filter replacement, helping maintain system efficiency and indoor air quality.
• Room Temperature Calibration: Built-in calibration adjustment lets you offset the displayed temperature to match a reference thermometer, ensuring accurate comfort control.

The T721 works with multi-stage heat pump systems rated at 24V, supporting 2-stage heating and 1-stage cooling (2H/1C configuration). The thermostat is also compatible with standard 2 heat/1 cool conventional systems when configured for electric or gas operation. It operates in ambient temperatures with up to 90% non-condensing humidity and displays temperatures from 41°F to 95°F, with control range spanning 44°F to 90°F. The universal sub-base accommodates both wall mounting and junction box mounting.

The T721 installs using color-coded terminal blocks that simplify wire identification and connection during setup. The universal sub-base mounts directly to a wall surface or over a standard junction box opening. No specific maintenance procedures are documented beyond periodic battery replacement when using battery power mode and occasional cleaning of the display surface.

The thermostat package includes the T721 display unit, mounting sub-base, installation hardware, and printed installation instructions and user guide.

Pro1 IAQ backs the T721 thermostat with a 5 year warranty. Specific coverage details and support contact information are available in the included documentation.

A: Yes, heat pump systems require a thermostat with specific features the T721 provides. The T721 includes separate B and O terminals to properly control the heat pump's reversing valve, which switches the system between heating and cooling modes. Standard thermostats lack these terminals and cannot operate heat pump equipment correctly. The T721 also offers independent heating and cooling cycle adjustments, allowing you to optimize performance for each mode of operation.

A: The T721 includes a room temperature calibration adjustment feature that allows you to offset the displayed temperature reading. To restore factory settings, consult the user guide included with the thermostat for the specific button sequence or switch position. The thermostat also features selectable settings for compressor delay protection and filter change indicator that can be turned on or off as needed.