Siemens SFA71U Zone Valve Actuator 24V 2-Position

The Siemens SFA71U is a 24V AC electronic zone valve actuator built for 2-position, normally closed operation with spring return fail-safe action. It runs on hardwired low-voltage control at 60 Hz, features a 10-second run time, and provides visual position indication for quick diagnostic checks. Direct-coupled mounting allows tool-free installation. Rated for a temperature range of 41°F to 122°F and UL certified, it serves split systems, heat pumps, furnaces, and air handlers in residential or commercial applications, and is compatible with heat pump systems. This actuator is an OEM replacement designed for Siemens 599 Series zone valves and is compatible with Siemens equipment only. It pairs with a thermostat having zone control capability. Use it to correct symptoms such as a zone valve not opening, a valve stuck closed, no heat or cooling to a zone, or an actuator that fails to respond to thermostat calls. Dimensions are 4-1/2" W x 3-1/2" H x 2-1/4" D, weighing 1.18 lbs, suitable for DIY-friendly installation.