What is the difference between the 32001605-002 and the 32001605-002/U

This OEM York replacement part provides exact tolerances for gas-to-air ratios

Rated for up to 30 Amps at 480V AC

or system upgrade

Allanson 444-BT636 Transformer R-410A What is the difference betweenThe Allanson 444 BT636 is a professional grade ferromagnetic service replacement transformer engineered for demanding oil burner applications. Operating on a 240Vac supply voltage, this unit delivers a consistent 10,000Vac secondary voltage at 23mA, utilizing a mid point ground configuration. As a veteran in the field, you know the value of the "Universal" designation; this model features six position adaptability and includes a universal base plate