Supco BC7070 Blower Control

The Supco BC7070 Blower Control is a versatile 24V time delay relay engineered for universal compatibility in residential and light commercial HVACR equipment. This non-integrated furnace blower control board features an adjustable timing circuit that manages the fan on-off delay between 0 and 4 minutes (0-240 seconds). By allowing the heat exchanger to reach optimal temperatures before the blower engages and purging residual heat after the cycle ends, it maximizes thermal transfer and system efficiency. The BC7070 is a heavy-duty SPST relay designed to handle 1 HP at 120 VAC or 2 HP at 240 VAC, making it a robust solution for air handlers and heat pump systems. It serves as the direct S1-7956A-3771 replacement and is functionally equivalent to the Camstat 7070 and F7070 controls. The surface-mount housing and 1/4 inch quick-connect terminals ensure a streamlined installation for field technicians replacing legacy or failed HVAC blower timers.

• Precise Timing Control: Dual potentiometers allow independent adjustment of both ON and OFF delays from 0 to 4 minutes.
• Broad Cross-Reference: Directly replaces S1-7956A-3771, 7070, F7070, and ICP numbers 1005229, 1065750, and HQ1005229CS.
• Universal Voltage Application: Accepts an input voltage of 18 to 30 VAC while controlling high-voltage blower loads.
• Rugged Construction: Features a conformal coated PCB and a molded ABS housing to withstand operating temperatures from -40°F to 175°F.
• Energy Efficiency: Improves SEER/AFUE performance by reducing short-cycling and optimizing airflow during the heating cycle.

Is the Supco BC7070 compatible with 120V and 240V blower motors?
Yes, while the control circuit operates on 24 VAC, the SPST relay contacts are rated for 1 HP at 120 VAC and 2 HP at 240 VAC, allowing it to interface with most standard blower motors.

How do I adjust the time delay on this unit?
The board includes adjustable dials that permit the technician to set the specific blower on-off delay required for the furnace or air handler, ranging from immediate activation to a 240-second lag.

Does this board replace the OEM Camstat 7070?
Yes, the BC7070 is part of the Supco Camstat line and is the designated direct replacement for the original 7070 and F7070 series controls.

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.