Temperature Control

Johnson Controls

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.
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.
A11 Low Temp Cutout Series Image
  • Precision Repeat Accuracy Remains Unaffected by Ambient Temperature at the Control Diaphragm Cup and 4 ft (1.2 M) Capillary (20 ft [6.1 M] Sensing Bulb Must Be in the Controlled Area)
  • Trip-Free Manual Reset Allows the Lever to Reset. You Must Press and Release the Lever Before Operation Resumes.
  • Precision Snap-Acting Contacts in a Dust Protected Enclosure Enables the A11 Control to Operate to the Fullest Potential
  • Direct Reading Scale Provides Easy-to-Adjust Setpoint. Adjustments Can Be Made from the Top or Bottom of the Control.
A11 Series Low Temperature Cutout Controls are available with single-pole, single-throw (SPST) or single-pole, double-throw (SPDT) contact action. Typical applications include the sensing of low temperature conditions to avoid over cooling or icing of hydronic coils, cooling coils, and liquid-handing pipes. The controls are compact and sturdy, and have an adjustable temperature setpoint range with a fixed differential. The range adjustment screw is accessible at the bottom of the control, and at the top of the control when the cover is removed.
The A11 Controls are compact and sturdy and feature an adjustable range with a fixed differential. The range adjustment screw is accessible at the bottom of the control or at the top, when the cover is removed. A factory-set low temperature stop is available when specified.
A19 Hot Water Temperature Control Series Image
  • Liquid-Filled Element Provides Rapid Response to Temperature Change
  • Adjustable Differential
  • Universal Replacement
The A19 Series Temperature Controls are a universal replacement control for open high or single-pole, double-throw (SPDT) applications. The control is furnished with a well assembly for 1/2 in. tapping. This operating control is ideal for hot water boilers.
A28 Two Stage Duct Thermostat Series Image
  • Flat Flange Mounting with Special Coil Element Permits Positioning of Sensing Bulb in the Appropriate Portion of the Air Stream
  • Unaffected by Barometric Pressure or Cross Ambient Temperatures
  • Two Single-Pole, Double-Throw (SPDT) Snap-Acting Switches
The A28AK is a two-stage temperature control with special air coil sensing element and adjustable mounting flange. These duct thermostats are used on roof top units, make-up heaters, duct heaters, and air handling systems of all types.
A350E On-Off Temperature Control Series Image
The A350E is an on/off, electronic, cooling-only control with Single-Pole, Double-Throw (SPDT) relay output and Light-Emitting Diode (LED) relay status indication. A cooling-only control, the A350E has two features that differentiate it from the A350A/B Series Electronic Temperature Controls: a selectable minimum setpoint and short/open sensor detection. The A350E also has an adjustable differential and an interchangeable temperature sensor. As are all System 350 products, the A350E is housed in a NEMA 1, high-impact plastic enclosure. The modular design provides easy, plug-together connections for quick installation and future expandability.
A70 4 Wire 2 Circuit Control Series Image
  • Automatic or Manual Reset Models
  • Long-Life, Snap-Acting Contacts
The A70 Series Temperature Control incorporates a vapor-charged sensing element. The A70G, A70H, and A70K have a four-wire, two-circuit contact block that contains two isolated sets of contacts. The contacts are designed so that when the main contact opens, the auxiliary contact closes. Typical applications include energizing an indicator light after a low temperature cutout on a ventilating system
A72 Cooling Tower Control Series Image
  • Open High or Close High Models Are Available
The A72AE and A72CE are wide range temperature controls with heavy duty double-pole, single-throw (DPST) contacts and neoprene-coated sensing elements. Use for control of cooling tower fans; motorized valves or solenoid operated valves.
A19 Agricultural Thermostat Series Image
  • Exposed Portion of the Liquid Filled Sensing Elements Are Plated and Plastic Coated to Resist Damage in Corrosive Atmospheres
  • An O-Ring Sealed Setpoint Adjustment Knob
The A19PRC is a single-stage temperature control designed for heating and ventilation applications. It features a rain-tight enclosure for use in agricultural and industrial applications that require compliance with Article 547 of the National Electrical Code. The A19PRC Thermostat has a rugged thermoplastic enclosure that meets NEMA 4X specifications. Typical applications include controlling ventilation or heating equipment in animal confinement or industrial buildings.
A19 Automatic Changeover Series Image
The A19 Series Changeover is a control for use with combination heating and cooling thermostats. This control automatically selects the correct thermostat function. Recommended for convectors, fan coils, and blast coil units, and similar devices. The A19CAC-2 Control can be mounted directly on either a vertical or a horizontal pipe, using the can mounting strap supplied with control. The A19CAC-1 Control has a remote bulb for greater mounting convenience.
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