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Engineered for professional-grade HVAC circuit board troubleshooting
Engineered for general service applications
making it suitable for steam and hot water applications
Status Diagnostics: Integrated dual-color LED provides immediate visual feedback for normal operation
Verify your primary voltage before installation to avoid electrical failure
Lochinvar & A.O. Smith 100109934 Switch Refrigerant Engineered for professional-grade HVAC circuitThe Lochinvar & A. O. Smith 100109934 Switch is a critical safety component engineered for high efficiency condensing boilers and commercial water heaters. Functioning as a blocked outlet switch, this normally closed (NC) pressure sensor is calibrated to 2. 6" WC to monitor exhaust backpressure. If the venting system becomes obstructed by debris, ice, or mechanical failure, the 100109934 triggers an immediate system lockout to prevent the hazardous
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