What is the required input signal for modulation

this Trane control board features a 24V power requirement and is compatible with 60 Hz electrical infrastructures

You can measure this at the FC+ and FC- test pins

Can this actuator replace a Johnson Controls M9124 series

Bradford White 233-40876-03 Pilot Assembly L99H008 What is the required inputThe Bradford White 233 40876 03 Pilot Assembly is a critical OEM replacement component designed for high recovery commercial and residential atmospheric vent water heaters. This natural gas pilot assembly features a durable thermopile and thermocouple configuration, ensuring precise flame rectification and consistent millivolt generation for the gas control valve. Engineered to withstand high combustion chamber temperatures, the 233 40876 03