Utica-Dunkirk 240009339 Sensor 321894-709 using OEM-spec gaskets is the

using OEM-spec gaskets is the only way to ensure the boiler pump flange maintains structural integrity under load

Lennox often uses these two numbers interchangeably for the same interlock switch assembly

Key Benefits for Technicians Early Detection: Identifies bearing wear and metal fatigue through comprehensive wear metal analysis

9-ton capacity

If the valve fails to open despite receiving power

Utica-Dunkirk 240009339 Sensor 321894-709 using OEM-spec gaskets is theThe Utica Dunkirk 240009339 Sensor is a critical OEM component for hydronic heating systems requiring high precision temperature monitoring. This 24 inch hot water sensor is a direct replacement part engineered specifically for L7221 and L7248 Aquastat controls. As a veteran grade boiler temperature sensor, it provides the low voltage resistance feedback necessary for the control board to manage ignition cycles and high limit safety protocols