Aprilaire 4007 White Nylon Orifice for 110, 220 Humidifiers

• Blue orifices are the tiny nylon components which accurately meter the flow of water into your humidifier

Sid Harvey Item #:4007AA: Replaces Part #:'s : 2191,
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Aprilaire 4007AA

Aprilaire 4403 Black Plastic Scale Control Insert with Float Chamber for 400, 400M model Humidifiers

• Easy to install and remove
• Cleanable, see maintenance instructions
• Drain hole down orientation

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Aprilaire 4403AA

Aprilaire 4240AA Male Disconnect Assembly,
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Aprilaire 4240AA

Aprilaire 4407 Water Distribution Tray for 400, 400M Humidifier

• Water distribution tray distributes water evenly to all portions of the water panel
• It attaches to the U-shaped scale control insert part number 4403

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Aprilaire 4407AA

Aprilaire 4232 Blue Nylon Orifice for 350, 360, 440, 700, 760, 768 Humidifiers

Aprilaire 4232AA

Aprilaire 4330 Black Plastic Scale Control Insert for 500, 500M, 600, 600A and 600M Humidifier

Aprilaire 4330AA

Aprilaire 4410 Water Level Sensor Assembly for Aprilaire 400, 400A and 400M Humidifiers, 24 VAC , 5-3/4" L Water level sensor assembly to fit certain Aprilaire models. Fits at the bottom of the scale control insert. It has 2-magnetic reed switches wired in series in it which look for the location of the 2-floats that are sold separately. If both floats are sitting at the bottom of the sump (there is no water in there) the 2-magnetic reed switches will close. This turns the water solenoid valve on and sends water to the top of the pad. Excess water then runs down into the sump causing the 2-floats to float up and break the circuit to the solenoid valve. If either float rises up the level sensor switch will open and close the solenoid valve.

Aprilaire 4410

Aprilaire 4332 Damper Assembly, 5-3/4"

Aprilaire 4332AA

Aprilaire 4331 Water Distribution Tray for 500, 500A, 500M, 600, 600A, 600M Humidifiers

Aprilaire 4331AA

Aprilaire 4406 Float Assembly for 400, 400M Humidifiers

• These float in the scale control insert/float chamber to control the supply of water
• When the water level is high enough, the right hand float turns off the water supply
• As water evaporates and the float reaches the bottom, the electronic switch is activated

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Aprilaire 4406

Aprilaire 4236 Black Plastic Scale Control Insert for 560, 560A, 568, 700, 760, 760A and 768 Humidifier

Aprilaire 4236AA

Aprilaire 4336 Resistor Case and Manual Mode Label For Use with 500, 500A, 500M Model Humidifers, 3-1/2" L

Sid Harvey Item #:4336AA: Replaces Part #:'s : 2362,
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Aprilaire 4336AA