B2015-S85 B2017-S85 4040 24V Humidifier Solenoid Valve

Key Features

• Electrical Rating: 24 Volts, 2.3 Watts, 60 Hz
• Construction: Durable brass body
• Inlet: Threaded with an integrated strainer screen to filter debris
• Function: Controls water flow to the humidifier distribution tray

Replaces / Cross-Reference Part Numbers

• 4040
• B2015-S85
• B2017-S85
• 4040-001

Compatibility & Fitment

• Fits Aprilaire humidifier models including the 200, 400, 500, 600, and 700 series.
• Specific compatible models include: 220, 224, 400A, 400M, 440, 500, 500A, 500M, 550, 550A, 558, 560, 560A, 600, 600A, 600M, 700, 700A, 700M, 760, 760A, 768

When to Replace

• Humidifier fails to produce humidity due to lack of water flow.
• Water continuously runs or leaks from the valve when closed.
• Valve produces a loud buzzing or humming sound but does not open.
• Visible cracks, corrosion, or damage to the valve body or electrical connections.

Installation Tips

• Disconnect power to the furnace and shut off the water supply before starting.
• Note the orientation of the old valve and install the new one in the same direction of water flow.
• Use pipe thread sealant on male threads for a leak-free connection. Do not overtighten.
• After installation, turn the water supply back on and check for leaks before restoring power.