HVAC controllers are used to regulate the operation of heating or air conditioning systems in a building, plant or room.

HVAC control systems use sensing devices like thermostats, humidistats and process controllers to compare the actual state of an environment with a predetermined setpoint. Controllers then turn on or turn off heaters, air conditioners and fans to adjust the ambient temperature and humidity to match the target state.

HVAC controllers use a combination of analog and digital inputs and outputs to perform a variety of actions, including taking measurements, starting and stopping equipment, and opening or closing valves, dampers and more.

A19 Thermostat for Hazardous Locations Series Image
  • Precision Enclosed Switch and a Liquid-Filled Sensing Element Provides Repeat Accuracy That Is Unaffected by Barometric Pressure and Cross-Ambient Temperature Fluctuations
  • Single-Pole, Double-Throw (SPDT) Switch Provides Open High or Close High Action for Heating or Cooling
  • Electrical Rating Permits Direct Control of Most Equipment
The A19 Series Thermostat provides remote bulb or coiled bulb sensing for hazardous environments. These thermostats are designed for use in grain elevators, chemical and powder plants, mines, oil refineries, and similar sites. For use in Class I, Group D and Class II, Groups E, F, and G hazardous locations.
A19 Remote Bulb Control Series Image
  • Constant Differential throughout the Entire Range
  • Unaffected by Cross-Ambient Conditions
  • Fixed or Adjustable Differential Available
  • Variety of Sensing Element Styles
  • Wide Temperature Ranges Available
  • Compact Enclosure
The A19 Series Controls are single-stage temperature controls that incorporate environmentally friendly liquid-filled sensing elements.
A28 4X Agricultural Thermostat Series Image
  • Exposed Portion of Liquid-Filled Sensing Elements Are Plated and Plastic Coated to Resist Damage in Corrosive Atmospheres
  • Rugged Thermoplastic Gasketed Enclosures That Meet NEMA 4X Specifications
  • Range Scale with Oversized White Markings for Easy Readability in Low Light
  • O-Ring Sealed Setpoint Adjustment Knobs
The A28PJ and A28PA are two-stage temperature controls with rain-tight and dust-tight enclosures. Designed for use in agricultural and industrial applications that require compliance with Article 547 of the National Electrical Code.
A350 On-Off Temperature Control Series Image
  • 5-Pin Connectors Eliminate Wiring Between Modules
  • Adjustable Setpoint and Differential
  • Field Selectable Heat/Cool Mode
  • Surface or DIN Rail Mounting
  • LED Indication of Relay Status
The A350A/B Series are On/Off temperature controls with a SPDT relay output and LED indication. These controls are used in conjunction with the A99B Series (PTC silicon) Temperature Sensors. Two basic models cover a temperature range of -30 to 250°F with an adjustable differential of 1 to 30F°. A350A controls incorporate Fahrenheit scales; the A350B models have Celsius scales. The S350 Stage, D350 Display, and Y350R Power Modules can be used with the A350A/B.
  • Frozen/Refrigerated Food Cases
  • Space Temperature Control
  • Cooling Tower Control
  • Beverage Coolers
  • Chiller Staging
T775 Series 2000 Standalone Series Image
  • Use the Time Clock Scheduler or Digital Input to Control the Setback and Disable Output Options to Help Save Energy
  • Protect Equipment from Freezing or Overheating On Models with the Modulating High or Low Limit Control Option
  • Eliminate the Need for a Separate Time Delay Device and Protect Equipment with the Minimum Off Time Option
  • Get Pinpoint Control on Modulating Outputs by Setting the Integral and Derivative Times (PI or PID)
  • Control Floating Actuators with Floating Outputs on Select Models
  • Configure Models with Reset in a Few Easy Steps
The T775 electronic remote temperature controllers are the next generation of commercial and agricultural controls capable of remote sensing of temperature and providing switched and/or proportional outputs to various types of loads. Save time on installations with the easy-to-use graphical Interface, large display, and the intuitive programming.
  • Sensor 50021579-001 included with non-NEMA 4X models
  • Sensor T775-SENS-WR included with NEMA-4X models
  • Combines Minimum Damper Position Potentiometer and Compressor Staging Relay Functions with Solid State Temperature (10K NTC) and Humidity or Enthalpy Changeover Control; This Control Can Be Tempered By DCV and Fan Cycling
  • Operates From the Space Thermostat and a DCV Sensor to Provide a Totally Integrated Control System
  • Case Matches the Lines of the M7215 Damper Motor
  • LED Indicates the Status of the Device
  • Communicates with Trane ReliaTEI
The W7340 Communicating Economizer Logic Module is used multiple sensors and proportions outdoor and return air damper motors for control of free cooling in commercial HVAC equipment. Replaces Black units only.
  • Fully Enclosed, SPST, Snap-Acting, Dust-Proof Switch is Designed for Wall or Surface Duct Mounting
Mechanical humidity controllers provide automatic control of humidifiers and dehumidifiers or ventilators in central heating and air conditioning systems.
  • Sensing Element of Thin, Moisture Sensitive Nylon Ribbon Provides Reliable Operation Even When Ambient Temperature Conditions Change
  • Positive ON-OFF Settings Permit Manual Operation of Controlled Equipment
  • Impact-Resistant, Molded Plastic Cover Mounts on Wall
  • Fully Enclosed, Dust Free, SPST, Snap-Acting Switch
Provide automatic control of a humidifier or dehumidifier for dehumidification in air conditioning systems.
  • Automatically Detects Presence of Outdoor Sensor to Set Control to Automatic or Manual Mode
  • Automatic Humidification (Window Protection) with Included Outdoor Sensor
  • Manual Humidification and Dehumidification Control
  • Adjustable High and Low Range Stops (10-90%)
  • RH% and Outdoor Temperature Calibration
  • Dehumidifier Compressor Protection
  • Simple, Intuitive Programming
  • Large, Digital Backlit Display
Easy to use, digital control of your home’s humidification or dehumidification. HumidiPRO™ will automatically adjust settings for changes in outdoor temperature to ensure no condensation will appear in your home (window protection).
  • Choice of Differential Temperature, Outside Air Dry Bulb, and Enthalpy Economizer Switchovers
  • Mounts Upright with the Integral Bracket and Two No. 8 Sheet Metal Screws
  • Includes Hypodermic Needle Test Points on All Inputs and Outputs
  • Compatible with All Pneumatic Controllers and Transmitters
The N-1001 Economizer Logic Network provides a sequence of logic functions for use with all types of mixed air handling units. The N-1001 provides fan interlock and minimum percent outside air damper position adjustment, as well as economizer switchover and other auxiliary switching strategies.
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