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    Aprilaire 866 Steam Humidifier

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      Select a diagram to view its parts

      Parts
      Parts
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      Steam Humidifier Installation Accessories
      Parts

      Diagram

      Parts
      1
      3
      4
      5
      6
      7
      8
      9
      10
      12
      13
      14
      15B
      16
      17B
      18
      19

      Parts

      1. 1
        Strainer Screen
        Strainer Screen
        SKU: 4004

        1

        Needed
        $6.25
        View Details
      2. 3
        Transformer
        Transformer
        SKU: 5306
        75 VA

        1

        Needed
        $116.55
        View Details
      3. 4
        Electrode Wire
        Electrode Wire
        SKU: 4978

        1

        Needed
        $25.45
        View Details
      4. 5
        Drain Valve
        Drain Valve
        SKU: 4983
        24 VAC

        1

        Needed
        $361.15
        View Details
      5. 6
        Fill Valve
        Fill Valve
        SKU: 5531
        24 VAC

        1

        Needed
        $75.10
        View Details
      6. 7
        Drain Cup
        Drain Cup
        SKU: 4985

        1

        Needed
        $59.95
        View Details
      7. 8
        Front Panel & Screw
        Front Panel & Screw
        SKU: 4986

        1

        Needed
        $65.15
        View Details
      8. 9
        Electrical Access Panel & Screw
        Electrical Access Panel & Screw
        SKU: 4987

        1

        Needed
        $75.65
        View Details
      9. 10
        Safety Interlock Switch
        Safety Interlock Switch
        SKU: 4988

        1

        Needed
        $27.35
        View Details
      10. 12
        Fill Cup Cap
        Fill Cup Cap
        SKU: 4990

        1

        Needed
        $5.30
        View Details
      11. 13
        Steam Dispersion Tube & Screws
        Steam Dispersion Tube & Screws
        SKU: 4991

        1

        Needed
        $61.40
        View Details
      12. 14
        Steam Canister & O-Ring
        Steam Canister & O-Ring
        SKU: 80

        1

        Needed
        $110.15
        View Details
      13. 15B
        Automatic Humidistat Controller
        Automatic Humidistat Controller
        SKU: 65
        Wall Mount

        1

        Needed
        $126.20
        View Details
      14. 16
        Modulating Control Board
        Modulating Control Board
        SKU: 5554

        1

        Needed
        $107.95
        View Details
      15. 17B
        Grille
        Grille
        SKU: 4998

        1

        Needed
        $85.65
        View Details
      16. 18
        Fan
        Fan
        SKU: 4999

        1

        Needed
        $99.95
        View Details
      17. 19
        O-Ring
        O-Ring
        SKU: 5258

        1

        Needed
        $7.35
        View Details

      Parts Not In Diagram

      1. Not Shown
        Saddle Valve
        Saddle Valve
        SKU: 4001

        1

        Needed
        $9.80
        View Details
      2. Not Shown
        Drain Trap
        Drain Trap
        SKU: 4028

        1

        Needed
        $109.55
        View Details
      3. Not Shown
        Airflow Switch
        Airflow Switch
        SKU: 4592

        1

        Needed
        $109.35
        View Details
      4. Not Shown
        High Humidity Limit Switch
        High Humidity Limit Switch
        SKU: 4594

        1

        Needed
        $312.85
        View Details
      5. Not Shown
        Blower Activation Relay
        Blower Activation Relay
        SKU: 4851

        1

        Needed
        $39.05
        View Details
      6. Not Shown
        High Temperature Condensate Pump
        High Temperature Condensate Pump
        SKU: 4856

        1

        Needed
        $116.45
        View Details
      7. Not Shown
        Steam Hose Kit
        Steam Hose Kit
        SKU: 4973

        1

        Needed
        $78.45
        View Details
      8. Not Shown
        Drain Hose Kit
        Drain Hose Kit
        SKU: 4974

        1

        Needed
        $74.30
        View Details
      9. Not Shown
        Condensate Tubing
        Condensate Tubing
        SKU: 4997

        1

        Needed
        $45.35
        View Details
      10. Not Shown
        Steam Humidifier Fan Pack
        Steam Humidifier Fan Pack
        SKU: 5658

        1

        Needed
        $744.45
        View Details
      Installation Accessories
      Shop Accessories
      Aprilaire 866 Steam Humidifier

      Documentation

      866 Spec Sheet
      866 Installation and Owner's Manual
      The Aprilaire 866 humidifier requires regular maintenance consisting of replacing the steam canister as it scales up with mineral deposits from your water supply. The Aprilaire Model 866 Steam Humidifier is a self-contained device that takes tap water and boils it, using electrode technology, to create steam. The humidifier generates steam by energizing two electrodes that extend into a canister of water. Current flowing between the electrodes causes the water to boil, creating steam. The steam flows through a steam hose and is injected into a moving airstream by the way of a distribution tube. The steam flows out of the distribution tube into the ductwork through a series of small tubelets which create an even, drip-free transfer of steam into the moving airstream.