Honeywell T991B1003 Modulating Temperature Reset Controller

Automatic outdoor reset controller for air or liquid. Raises heating medium control point automatically as outdoor temperature falls.

Features:

• Used for modulating control of water or air temperature in ducts or tanks
• 70 to 140 Deg F Setpoint Temperature Range
• 24 Vac to 30 Vac Voltage
• 3 to 10 Deg F Throttling Range
• Analog Output
• One 135 Ohm Potentiometer Analog Output
• 1/2" diameter x 4" long bulb size
• 5-5/8" high x 2" wide x 2-1/4" deep
• Raises heating medium control point automatically as outdoor temperature falls.
• One remote element senses heating medium, the other senses outdoor air temperature.
• Output type - Analog
• Voltage - 24 Vac to 30 Vac

Technical Information:

• https://customer.honeywell.com/resources/Techlit/TechLitDocuments/63-0000s/63-1102.pdf
  
• https://customer.honeywell.com/resources/Techlit/TechLitDocuments/60-0000s/60-1208.pdf
  
• https://customer.honeywell.com/resources/Techlit/TechLitDocuments/60-0000s/60-2055.pdf