Armstrong Furnace R40154B025 Limit Switch 319825-402 Use this refrigerant sight glass

Use this refrigerant sight glass to identify flash gas caused by liquid line restrictions or a shortage of refrigerant

If the 190F auto limit switch opens

This gauge is primarily used for monitoring water temperatures in hydronic heating systems

ensuring synchronized operation between the fan and heating stages

Armstrong Furnace R40154B025 Limit Switch 319825-402 Use this refrigerant sight glassThe Armstrong Furnace R40154B025 Limit Switch is a critical safety component engineered specifically for high efficiency HVAC systems. This L130F 30 flame rollout limit switch is designed to monitor internal furnace temperatures, automatically breaking the electrical circuit if the heat exceeds the 130F safety threshold. This genuine Armstrong replacement part ensures your heating system operates within manufacturer specifications, preventing heat