Aprilaire 4040
Aprilaire Humidifier Solenoid Valve 24v used in 400 500 600 700 Series
Aprilaire model 4040 replacement solenoid. Genuine Aprilaire solenoid for model 220, 224, 440, 550, 558, 560, 568, 600, 700, 760, 768. Includes the strainer 4004, installed in valve body.

Specifications printed on solenoid body: 24 volts, 60 Hz, Orifice (3/32 - 3/64).

Both the inlet and outlet are threaded 7/16"-24 UNS for accepting a compression fitting for ΒΌ" tubing. The inlet includes the compression fitting & ferrule. For the outlet, your existing compression fitting is reused.

Clean fresh water makes clean fresh air
Micro-Plus series
Solenoid installation (2 pages 303k pdf)See page 3 for wiring diagram (4 pages 270k pdf)

Aprilaire In-Line Strainer & Orifice

Clean fresh water makes clean fresh air Aprilaire Flow-Thru humidifiers have a solenoid with a small strainer filter in the body. These strainers should be inspected and cleaned when replacing the water panel. If the strainer becomes clogged the water pressure will tear it and pieces will jam the solenoid or loose pieces will block the orifice.

Aprilaire 24 Volt Solenoid
Aprilaire 4004 InLine Strainer Aprilaire 4231 Yellow Orifice

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