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Overview

Automatic outdoor reset controllers for air or liquid.

Features

  • Raises heating medium control point automatically as outdoor temperature falls.
  • One remote element senses heating medium, the other senses outdoor air temperature.
  • T991 has 135 ohm potentiometer for proportional heating control.

Product Specifications

Application
Provide modulating control of water or air temperature in ducts or tanks, setpoint automatically reset as outdoor temperature changes
Dimensions (in.)
5 5/8 in. high x 2 in. wide x 2 1/4 in. deep
Dimensions (mm)
143 mm high x 51 mm wide x 57 mm deep
Comments
Indoor bulb temperature plus outdoor bulb temperature must not exceed 265 F (129 C)
Item Type
Product
Frequency
50 Hz; 60 Hz
Voltage
24 Vac to 30 Vac
Setpoint Temperature Range (C)
21 C to 60 C
Setpoint Temperature Range (F)
70 F to 140 F
Operating Temperature Range (F)
125 F Maximum
Operating Temperature Range (C)
52 C Maximum
Output
analog
Analog Output
One 135 Ohm Potentiometer
Reset Ratio
1.0 to 1.0
Sensor Inputs
2
Sensor Element
Copper bulb
Capillary Length (ft)
Indoor: 10 ft, Outdoor: 30 ft
Capillary Length (m)
Indoor: 3 m, Outdoor: 9.1 m
Bulb Size (in.)
1/2 in. diameter x 4 in. long
Bulb Size (mm)
13 mm diameter x 102 mm long
Throttling Range (F)
3 F to 10 F
Throttling Range (C)
1.7 C to 16.7 C
Color
Gray
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