W42AA-1C | HUMIDISTAT; RM HUMIDISTAT; SPDT LINE VOLT; PILOT DUTY ONLY; 10/90%; 120 TO 240 VAC | Johnson Controls

HUMIDISTAT; RM HUMIDISTAT; SPDT LINE VOLT; PILOT DUTY ONLY; 10/90%; 120 TO 240 VAC

Application

The W42AA humidistat controls humidifying or dehumidifying equipment, or both. The humidistat is a 3-wire device with single-pole, double-throw, snap-acting contacts. A typical W42 application is for operating an exhaust fan in electrically heated homes. The humidistat automatically operates the exhaust fan to reduce the relative humidity when it is above normal. Other typical applications include humidity control in fruit storage rooms, curing rooms and hospitals where accuracy and reliability are required. All series W42 humidistats are designed for use only as operating controls. Where an operating control failure would result in personal injury and/or loss of property, it is the responsibility of the installer to add devices (safety, limit controls) or systems (alarm, supervisory systems) that protect against, or warn of, control failure.

Features

•  Three-wire SPDT switch permits control of humidifying or dehumidifying equipment or both with one control
• Stable and accurate human hair sensing element
• Easy to read dial is adjustable over a range of 10 to 90% RH • Concealed dial lock screw for sealed setting
•  Separable mounting plate with mounting screws attached, saving installation time. • Αttractive contemporary styling

General Description

The W42AA humidistat provides single pole, double-throw control for use on low or line voltage applications. The humidistat’s terminals are marked for easy wiring. The “C” terminal is common. The circuit between “C” and “L” terminals closes on a decrease in relative humidity. The circuit between “C” and “H” terminals closes on an increase in relative humidity.  The humidistat’s sensing element consists of approximately 150 strands of carefully selected and processed human hair -- proven to be the most sensitive and stable material known for humidity control. An exclusive tension release device keeps the hair strands from being damaged by extreme humidity or mechanical strain. The sensing element is mounted vertically to minimize surface contamination by dust or foreign material. The humidistat mounts on a standard outlet box or directly to a flat surface where permitted by electrical codes.

• Humidistat-Intermediate
• Room Humidisat
• SPDT
• Line Voltage
• Pilot Duty Only
• 10-90% Range