The Johnson Controls M9000-531 Linkage is a critical hardware assembly designed to mount M9116

efficient burner performance

the pressure switch is the primary safety interlock that verifies the inducer motor is moving sufficient combustion air through the heat exchanger before allowing the ignition sequence to proceed

this valve is factory-set for 4" WC natural gas but can be field-converted with the appropriate regulator spring kit

the normally open SPST contact remains open until the temperature rises to the 125°F close setpoint

Carrier 329117-702 Transition Assembly R-410A The Johnson Controls M9000-531 LinkageThe Carrier 329117 702 Transition Assembly is a high precision OEM Factory Authorized Part engineered to manage and direct internal airflow within residential and light commercial HVAC systems. This genuine Carrier replacement part ensures a seamless connection between ducting sections or blower components, preventing air leakage and reducing internal turbulence. Constructed from PBT GF15 glass filled thermal plastic, this transition assembly is