Venstar VST1100FS Thermostat

The Venstar VST1100FS is a professional-grade, 7-day programmable thermostat engineered specifically for multi-stage HVAC systems. As a direct replacement for HH07AT215, this unit offers a seamless retrofit for contractors maintaining older Carrier or standard 24V installations. This 2H/2C heat pump thermostat supports up to 2-stage heating and 2-stage cooling, featuring an intuitive auto changeover function to manage temperature fluctuations without manual intervention. The large, backlit Thermoglow display ensures visibility in mechanical rooms, while the non-volatile memory protects all HVAC configuration settings and schedules from being lost during power outages. With a low-profile design that sits flush against the wall and an adjustable deadband (1 to 6 degrees), the VST1100FS provides the precision and reliability required for commercial and residential comfort control.

• Universal Compatibility: Operates 2H/2C heat pump, gas/electric, and hydronic systems.
• Contractor Ready: Direct HH07AT215 replacement with standard terminal markings for rapid field installation.
• Energy Management: Features 7-day programming with 4 time periods per day and a holiday mode for up to 99 days.
• Equipment Protection: Integrated 5-minute compressor time guard prevents short-cycling to extend the life of the unit.
• Security Control: Supports keypad lockout to prevent unauthorized setpoint adjustments in high-traffic areas.

Is the Venstar VST1100FS compatible with a common wire?
Yes, this digital thermostat requires 24VAC power, typically supplied via a C-wire. For installations without a common wire, an ACC0410 Add-A-Wire accessory can be utilized.

Will this work as a direct swap for the HH07AT215 model?
The VST1100FS is the official replacement for HH07AT215. It utilizes the same footprints and provides full functional parity for multi-stage heat pumps.

Does it support outdoor temperature displays?
Yes, it is compatible with an optional outdoor sensor for real-time ambient temperature monitoring and improved heat pump balance point control.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.