Lochinvar & A.O. Smith 100110973 Switch 326010-701 and Arcoaire models like the

and Arcoaire models like the NTN5 and NDN5 series

it provides a reliable normally open circuit that closes only when the specific 0

Millivolt output optimized for standard standing pilot gas valves

providing superior flow capacity with a 6

Reliable Sensing: Optimizes microamp signal feedback to the control board to prevent false shut-offs

Lochinvar & A.O. Smith 100110973 Switch 326010-701 and Arcoaire models like theThe Lochinvar & A. O. Smith 100110973 Blocked Flue Switch is a critical safety component designed for high efficiency boilers and commercial water heaters. As a veteran technician knows, this negative pressure switch (often referred to as a spill switch) is engineered to sense obstructions in the venting system, protecting the heat exchanger from hazardous flue gas recirculation. When the integrated sensor detects a lack of proper draft or a blocked