The ASCO 8221G3-24V is specifically engineered as a slow-closing valve to neutralize the water hammer effect in pressurized systems

this is a surface mount aquastat

It features a 15-second pre-purge period and a 10-second trial for ignition (TFI) to ensure safe combustion cycles

providing critical fail-safe functionality

significant soot accumulation on the heat exchanger

Rheem-Ruud 62-21744-01 Flame Sensor R-22 The ASCO 8221G3-24V is specificallyThe Rheem Ruud 62 21744 01 Flame Sensor is a critical safety component designed for flame rectification in gas fired furnaces, water heaters, and boilers. As a direct OEM replacement, this furnace flame sensor rod utilizes high sensitivity metallurgy to detect the presence of a stable burner flame, sending a microamp signal back to the integrated furnace control board. If the sensor fails to verify ignition within the 4 second safety window, the