Water Solenoid Valve, 24V

Aprilaire 4040 Water Solenoid Valve – Technical Product Information

The Aprilaire 4040 Solenoid Valve is an electrically actuated water control component engineered for integration with Aprilaire humidification systems. Operating at 24 volts AC, this valve regulates water flow to the humidifier assembly, maintaining controlled water delivery for consistent humidification performance. Constructed for reliability in both residential and light commercial environments, the 4040 is designed to meet professional installation and service standards across multiple Aprilaire model configurations.

Technical Specifications

• Product Code: 4040
• Manufacturer: Aprilaire
• Component Type: Water Solenoid Valve
• Voltage Rating: 24 VAC
• Frequency: 60 Hz
• Application: Controls water flow to humidifier units
• Compatible Models: 800, 330, 445, 110, 112, 350, 360
• Installation Environment: Residential and Light Commercial Systems
• Operating Function: Normally Closed, Electrically Opened via Humidistat Signal
• Connection Type: Threaded Water Line Connection (dependent on system model)
• Wiring: Two-lead low-voltage connection; requires professional electrical installation
• Replacement and Service Components: Compatible with Aprilaire parts 4004 (strainer) and orifice assemblies 4231, 4232, 4007, and 4021
• Use Limitation: For use only with specified Aprilaire humidifier models; not suitable for commercial-grade humidifiers
• Compliance: Designed for use within standard 24V HVAC control systems

Professional Summary

The Aprilaire 4040 Water Solenoid Valve provides controlled water delivery for compatible humidification systems through low-voltage electrical actuation. Built for operational reliability, the 4040 valve maintains consistent flow characteristics and sealing integrity under standard HVAC line pressures. Its design supports precise humidifier control integration and straightforward serviceability during system maintenance or retrofit applications. Installation and wiring should be performed by qualified HVAC or mechanical contractors to ensure compliance with electrical and plumbing standards.