Common Questions Which furnace models use the Williams P323661

this 24VAC HSI control module provides reliable trial-for-ignition (TFI) sequences with integrated safety timings

For extreme pulsation

depending on your wiring diagram

Utica-Dunkirk 240007140 Pressure Switch 321702-401 Common Questions Which furnace modelsThe Utica Dunkirk 240007140 Pressure Switch is a critical safety component designed for high efficiency gas fired boilers and furnaces. Precision calibrated to a . 14"wc set point, this Normally Open (N O) diaphragm switch ensures proper draft and venting before allowing the ignition sequence to proceed. As an OEM replacement part, it offers a direct fit for Utica and Dunkirk hydronic systems, maintaining the narrow pressure tolerances required for