Heat & Humidity Sensors

Humidity Controller

• Wall-mounted, SPDT snap-acting switch
• Fixed Differential: 4 to 6 percent RH
• Sensing Element: Moisture-sensitive nylon ribbon.
• Max. Ambient Temp.: 125°F (52°C).
• Case Dimensions: 4-11/16 in. (119mm) high, 2-15/16 in. (75 mm) wide, 2-1/8in. (54mm) deep.
• Listed by Underwriters Laboratories Inc.
• Electrical Ratings: 5 amp
• Model HHD: High and Low Humidity detector. Contact closes when adjustable setpoint is exceeded.

1. Wires are coded for simplicity
2. Red and Black are used for Low Humidity Alarm. This normally open connection will close to initiate an alarm on the Annunciator, whenever the humidity falls below the adjustable point.
3. Red and Blue wires are used for the High Humidity Alarm. The connection will close whenever the humidity exceeds the adjustable setpoint.
4. Do not attempt to use a single controller for both high and low alarm.

1. Terminals are labeled as following: cool, heat and common.
2. Common and cool are used to initiate a high-temperature alarm.
3. This circuit closes whenever the room temperature exceeds the adjustable setpoint.
4. Common and heat can be used to initiate low-temperature alarm.