• aprilaire 600 seems like a good bypass humidifier
    • owner's manual
    • digital humidifer control installation instructions
  • furnace model #: 59sp5a100e2112200
    • service manual
    • product data
    • blower fan:
      • Carrier number HD52MQ128 (discontinued) replaced by HD52MQ133
      • OEM #ZWK702E0757201
      • ECM 1HP
      • takes 120V + 6 taps @ 24V for different fan speeds
      • speed is controlled internally inside the motor housing