White-Rodgers 1F78-151 Thermostat

The White-Rodgers 1F78-151 is a 5/2 day programmable thermostat designed for single-stage heating and cooling systems. Serving as the direct replacement for 9600 models, this 24V digital thermostat offers a reliable upgrade from mechanical mercury controls without requiring a wallplate footprint adjustment. It supports fossil fuel and electric heat configurations and is compatible with millivolt systems and single-stage heat pump applications without auxiliary heat. The unit features B and O terminals for reversing valve control and a backlit LCD for visibility in mechanical rooms. Technicians can adjust the temperature differential to fine-tune cycle rates, and the Energy Management Recovery (EMR) feature ensures the setpoint is reached exactly at the programmed time. Powered by two AAA batteries, the 1F78-151 maintains the permanent program memory during power outages, ensuring consistent climate control across heating and cooling cycles in residential or light commercial environments.

• Universal Compatibility: Works with gas, oil, electric, and millivolt systems, making it a versatile HVAC replacement part.
• Seamless Retrofit: Specifically engineered to cover the footprint of older mechanical thermostats, eliminating the need for wall repair or painting.
• Precision Control: Maintains temperature accuracy within +/- 1 degree with adjustable anticipation to prevent short-cycling.
• Contractor Friendly: Features a simple subbase mounting system and clear terminal designations (RC, RH, W, Y, G, O, B) for fast thermostat installation.

• Is the 1F78-151 compatible with 2-wire heat-only systems? Yes, it functions effectively on 2-wire systems by connecting to the RH and W terminals; a factory-installed jumper is provided for RC/RH applications.
• How do I configure this for a hydronic (steam or hot water) system? The internal W905 jumper on the circuit board can be clipped to provide a longer heating cycle more suitable for hydronic heating.
• Does this unit support heat pumps with emergency heat? No, this is a single-stage thermostat only. For systems with auxiliary or emergency heat strips, a multi-stage control is required.

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.