and 12KW systems

Relying on genuine Carrier replacement parts maintains the factory-specified logic necessary for safe gas valve operation and optimal furnace control board troubleshooting

By modulating the flow of R-410A refrigerant based on cooling demand

A critical technical feature for service technicians is the replaceable packing gland

or a blank status display

Lennox 17J65 Orifice 322056-301 and 12KW systemsThe Lennox 17J65 Natural Gas Orifice (Part Number LB 69645) is a precision engineered heating component designed specifically for secondary burner regulation in residential furnaces. With a drill size specification of 0. 0935, this OEM Lennox replacement part ensures the exact volumetric flow rate required for efficient combustion and peak AFUE ratings. As a veteran technician knows, maintaining the correct manifold pressure depends entirely on the