Yesterday Ken D. with K&N Electric and Richard M. installed the new 28 A, 480 VAC variable transformer at MY to bypass the problematic SCR and power the GN2 heater. Today Kyle, Gerardo and I turned it on. We first flowed unheated, vaporized GN2 and let the temperature settle (~20C) and then ramped the variac to 40% power, until the temperature stabilized to ~85C. After lunch I increased it to 45% power and will wait till it stabilizes and will continue that trend until we reach 160C. The GN2 flow fluctuates between 20-60 scfhx100 with one full turn on draw valve. We may need to increase flow over time as the vaporizer cools down and the Dewar level decreases. The exhaust temperature is currently 65C.