Always verify your heater’s unit model number and serial number against the manufacturer’s technical data sheet to ensure the orifice sizing matches your specific BTU rating

it ensures precise fitment and restores factory-spec heat staging in AAON air handlers and rooftop units

which makes standard insulation brittle and leads to signal leakage or broken conductors

From there

This OEM replacement part is essential for troubleshooting error codes related to communication failures or display malfunctions

Trane VAL8359 Valve 318423-701 Always verify your heater’s unitThe Trane VAL8359 is a technical grade 6 ton heat pump reversing valve engineered to manage refrigerant flow direction with precision. Designed for both residential and light commercial integration, this 4 way reversing valve features 1 2" x 7 8" ODF sweat connections and is powered by a standard 24V solenoid coil. As a critical component in high capacity HVAC refrigeration cycles, it enables seamless switching between heating and cooling modes. The