I need to control a 2 speed Carrier Infinity Seer 19 condenser (NOT HP) using the Y1, Y2 terminals NOT and the infinity interface. This is because the furnace is a Heil 96%/Vs unit not compatible with Infinity. Units were not replace at the same time. Can the Infinity interface PCB be disabled? Carrier installation manual indicated Infinity controller is required but unit has G,C,Y1,Y2 terminals and operates perfect with 24v on Y1 &Y2. However, unit will not start with power on Y1 only. Heil furnace blower drops speed when set to Y1 so reduced cfm flow looks reasonable on the air side.