Trane TRR1581 Transformer 340155-7026 such as the W973 or

such as the W973 or M7415 series

As a veteran-choice HVAC zone valve motor

and Evergreen series boards

15 inches of water column activation is mandatory to meet York OEM specifications and maintain safe combustion cycles

Trane TRR1581 Transformer 340155-7026 such as the W973 orThe Trane TRR1581 Transformer is a heavy duty 75VA HVAC replacement part engineered for demanding residential and commercial applications. Designed to step down 200 230V primary voltage to a stable 24V secondary output, this component ensures consistent low voltage power for critical systems including furnace control boards, 24V thermostats, and contactor coils. As a genuine Trane OEM transformer, it eliminates the guesswork of universal fitments,