Resideo S688A1007 Sail Switch 5 Inch Wide Sail

Product Description

The RESIDEO S688A1007 is a sail switch designed to detect airflow in forced-air HVAC systems. It uses a physical sail element to sense moving air and trigger or interrupt a control circuit based on airflow presence. The S688A1007 ships with a 5-inch wide sail, making it suitable for larger duct cross-sections where a broader sensing surface is needed to reliably detect airflow. Licensed HVAC technicians install this switch as part of safety interlock circuits that prevent heating or cooling equipment from operating when airflow is absent.

This sail switch is used in residential and light commercial forced-air systems, typically mounted inside a supply or return duct. It is commonly installed in gas furnace, heat pump, and air handler applications where airflow verification is required by the control sequence. The switch is sold as a single unit and is appropriate for new installations or direct replacement of a failed sail switch in an existing duct-mounted position.

Key Features

• 5-inch wide sail provides reliable airflow detection in larger duct installations
• Compact housing at 3.5 x 2.1 x 1.8 inches fits standard duct access cutouts
• Packaged as a single unit for one-for-one replacement installs
• Lightweight at 0.85 pounds for easy handling during overhead or confined duct work
• Designed for integration into control interlock circuits that require airflow confirmation before equipment operation

Compatibility

Designed as an OEM-style replacement sail switch for residential and light commercial forced-air HVAC systems requiring duct-mounted airflow sensing.

Installation Notes

Sail switches are installed by licensed HVAC technicians. Disconnect power to the air handler or furnace control board before beginning installation. The switch mounts through a field-cut hole in the duct wall, with the sail oriented perpendicular to airflow direction. Verify control circuit wiring connections are secure and confirm proper switch actuation during a test run before returning the system to service.