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• 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