AprilAire 4655 Manual 2 Wire Humidistat

• CONTROL SWITCH – An increase in relative humidity (RH) expands the nylon ribbon which opens the control switch to stop operation of the humidifier. A decrease in RH reverses the process and closes the control switch, turning on the humidifier.
• EASY INSTALLATION – This control can be mounted on a living space wall or on a return duct and must be a 24 VAC circuit only
• BUY WITH CONFIDENCE – The AprilAire 4655 is designed in the USA by AprilAire, the leader in Indoor Air Quality solutions for the home since 1954, and comes with a 5-year warranty

• Compatible Models: 400M, 400MK, 400MZ, 400MKZ, 500M, 500MK, 500MZ, 500MKZ, 600M, 600MK, 600MZ, 600MKZ, 620M, 700M, 700MZ, 700MKZ, 720M, 720MKZ
• Materials: Plastic
• Actual Measurements: 3.375H x 1.9375W x 5.125D (inches)

INCLUDED IN THE BOX:

• Wall-Mount Control
• Mounting Screws
• Drywall Anchors
• Gasket
• Installation Manual

The AprilAire 4655 Manual Humidistat for AprilAire Humidifiers can be installed on a living space wall or return duct-mounted.

The 4655 Manual Humidistat is the tried and true method of simple humidifier control. Utilizing a mechanical filament to measure changes in humidity, this humidistat provides a dry-contact closure that can be used with evaporative or steam humidifiers, past or present.