Marvair 20509 TXV Valve 340155-7026 and audible buzzing or humming

and audible buzzing or humming originating from the core assembly

medium is blue

Can I use this 50VA unit to replace a 40VA transformer

it is the designated furnace circuit board replacement for many Bryant and Payne models that originally utilized the HK42FZ028 control module

What is the difference between this and the P170 series

Marvair 20509 TXV Valve 340155-7026 and audible buzzing or hummingThe Marvair 20509 TXV Valve is a high precision thermostatic expansion valve engineered for 3 ton HVAC systems, providing critical refrigerant metering for both commercial and residential applications. Featuring a 3 8 inch by 5 8 inch ODF connection, this thermal expansion valve is designed to stabilize superheat by accurately modulating refrigerant flow into the evaporator coil. As the official replacement TXV valve and direct updated version for