Model RKKB-A180CL35E Ser 2D6606ADAAF2302118777 3 draft inducers on this unit. Tech support at local counter says all motors would be calling at once on call for heat ( not sure about that). From left to right , motor one bad (240v to motor no operation) motor 2 ON at call for heat motor runs 240 volts, motor 3 no operation 65 volts. Checked the board which has Hi/lo called for heat in both stages and I get 240 volt at Lo terminal and 80 volt at Hi terminal. I neeed a IOM and schematic for this unit. Are all 3 Motors calling on 2 stage demand or is it firing in low for X mins then to Hi with 2 motors then to 3? need IOM and schematic. My objective is to determine if I have a bad relay on the board which feeds the #3 motor... This motor is good jumped out to confirm.
Bonus question ... anyone know what size filters for this unit?