* aprilaire 600 seems like a good bypass humidifier
    * {{ ::aprilaire-humidifier-model-550-owners-manual-obs.pdf | owner's manual}}
    * {{ ::aprilaire_60_and_62_installation_instructions.pdf | digital humidifer control installation instructions}}
  * furnace model #: 59sp5a100e2112200
    * [[https://www.hvacpartsshop.com/content/carrier-hvac-manuals/59SP5A.pdf|service manual]]
    * [[https://americancoolingandheating.com/wp-content/uploads/carrier-product-data-specifications/59SP5A-02PD.pdf|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