allowing the HVAC high limit switch to re-engage once the system cools to 110°F

the Armstrong 811 offers exceptional resistance to wear and water hammer

ensuring it can handle significant thermal expansion without compromising equipment integrity

Enhanced Thermal Safety: Rated at 160°C to accurately monitor combustion chamber temperatures and prevent vapor ignition risks

Common Questions Can I use a single dry contact to trigger multiple RIB21CDC relays

Utica-Dunkirk 240009793 Pressure Switch 320720-756 allowing the HVAC high limitThe Utica Dunkirk 240009793 Pressure Switch is a critical OEM furnace replacement part designed for specific ECR International heating systems, including Dunkirk, Pennco, and Utica Boiler models. This 0. 50" WC pressure switch acts as a primary safety mechanism, monitoring the draft inducer motor to verify adequate negative pressure and airflow before allowing the ignition sequence to proceed. As a veteran grade HVAC safety control, it replaces worn