Type number matrix Contact functions | Johnson Controls A19A, A19D

2	A19A
2	Issue 03/03/2003

Note	Note

These controls are designed for use only as operating controls. Where an operating control failure would result in personal injury or loss of property it is the responsibility of the installer to add devices or systems that protect against, or warn of, control failure.

The standard screwdriver adjustment can be converted easily in the field to knob adjustment. Also concealing of adjustment and scale is possible after installation.

SPDT contacts are standard on all models. Instruments have compact sizes. Types A19ACC and A19ADC have a trip-free manual reset . Reset button must be pressed and released. Contact cannot be blocked in closed position. All types have VDE and SEV approval.

To facilitate ordering, wholesaler codes have been added on some universal models.

All models are provided with a separate knob and sealing cap.

Type number matrix

Contact functions

Types A19AAC,

A19AAF, A19ABC,

A19BAC, A19BBC,

A19DAC

θ >

Fig. 1

1-2 closes on temperature increase

A19AAC capillary thermostat, fixed differential. A19AAF capillary thermostat, special close

fixed differential.

A19ABC capillary or immersion thermostat,

adjustable differential.

A19ACC capillary thermostat, lock-out low with manual reset.

A19ADC immersion thermostat, lock-out high with manual reset.

Type A19ACC

2	3
	θ <
	1

A19BAC space thermostat, fixed differential. A19BBC space thermostat, adjustable

differential.

A19DAC strap-on thermostat. A19DAF strap-on thermostat

Adjustment

1.Models “set low” (refer to cover label) The dial indicates the low switch point (1 - 2 open, 1 - 3 closed).

The high switch point (1 - 2 closed,

1 - 3 open) is obtained by adding the differential to the low switch point.

2.Models “set high” (refer to cover label) The dial indicates the high switch point (1 - 2 closed, 1 - 3 open). The low switch point (1 - 2 open, 1 - 3 closed) is obtained by deducting the differential from the high switch point.

Exception: Type A19ADC, dial indicates high switch point ( 1 - 3 closed, 1 - 2 open).

Fig. 2
1-2 opens on temperature decrease
Type A19ADC	2	3
	2	3
	θ >
	1
	Fig.3

1-2 opens on temperature increase

Repair and replacement

Repair is not possible. In case of an improperly functioning control, please check with your nearest supplier. When contacting the supplier for a replacement you should state the type/model number of the control. This number can be found on the data plate or cover label.

Catalogue Section 1	© 2003 Johnson Controls Inc.
	Order No. PD-A19A-E

A19A, A19B, A19D specifications

Johnson Controls is a leading global diversified technology and multi-industrial company that emphasizes the importance of creating intelligent buildings and fostering sustainable environments. Among the many products that the company offers in its portfolio are the A19A, A19B, and A19D series, which are a set of advanced HVAC controls designed to optimize the efficiency and performance of building systems.

The A19A, A19B, and A19D represent different versions of Johnson Controls' space temperature sensors, each tailored to specific applications and environments. One of the main features of these models is their precise temperature sensing capabilities, which ensure that occupants remain comfortable while optimizing energy use.

A key characteristic of these sensors is their versatile mounting options. Designed for easy installation, the A19 series can be mounted on walls, in ductwork, or integrated into different control systems. This adaptability allows them to serve a variety of settings, from commercial buildings to industrial facilities, providing users with the flexibility to implement their HVAC systems effectively.

One of the standout technologies utilized in the A19 series is the advanced digital sensor technology, which helps enhance accuracy and response time. This technology significantly reduces the impact of temperature fluctuations, allowing for consistent performance and comfort. Additionally, they feature a robust design capable of withstanding diverse environmental conditions, ensuring reliability in both indoor and outdoor applications.

The A19D model, specifically, is geared toward those needing higher precision in temperature control. It is equipped with advanced calibration options, which allow for enhanced accuracy in specialized environments where temperature control is critical. Both the A19A and A19B models, while simpler, offer a balance between functionality and cost, making them ideal for a broader range of applications.

Another critical aspect of the A19 series is their compatibility with various building management systems. This integration capability allows for enhanced monitoring and control, facilitating smarter energy management practices.

In conclusion, Johnson Controls' A19A, A19B, and A19D temperature sensors are designed to provide high-performance HVAC solutions suitable for various applications. With their accurate sensing, robust design, and compatibility with modern building systems, these products play a crucial role in creating intelligent and energy-efficient buildings. As building technologies continue to evolve, the A19 series remains a staple in the commitment to sustainability and occupant comfort.