Instruction Manual

Product Overview

The Johnson Controls A19D Series Surface Mounted Temperature Controls are designed for reliable and durable On/Off temperature regulation. These controls feature line-voltage single-pole, double-throw (SPDT) switches, making them suitable for various commercial and industrial applications, particularly in fluid piping systems.

The A19DAF-2C model offers a temperature range of 200 to 240°F with a differential of 3-1/2°F (+/- 2.0°F) and a concealed range scale. It includes adjustable mounting straps for direct pipe installation.

An image showing the Johnson Controls A19DAF-2C temperature control unit, a gray rectangular box with a temperature dial on the front, and a metal mounting strap assembly beside it. The unit is designed for surface mounting, typically on pipes.

Key Features:

• SPDT Switch Action: Provides either high or low temperature detection.
• Sealed, Dust-Protected Switch: Ensures reliable and durable On/Off control for commercial and industrial applications.
• Color-Coded Electrical Terminals: Simplifies wiring procedures.
• Insulated Sensing Element: Minimizes the effects of ambient temperature on the control set point.
• Convertible Range Adjuster Kit: Offers knob, screwdriver, or concealed adjustment options.

Safety Information

Read all instructions carefully before installing or operating this device. Failure to follow these instructions could result in property damage, personal injury, or death.

• Always disconnect power before installing or servicing the control.
• Installation and wiring must comply with all local and national electrical codes.
• This device is intended for use by qualified personnel only.
• Do not exceed the specified electrical ratings.
• Ensure proper grounding to prevent electrical shock.

Package Contents

Upon opening the package, verify that all components are present and undamaged. The package for the A19DAF-2C typically includes:

• Johnson Controls A19DAF-2C Temperature Control Unit
• Adjustable Mounting Straps (2)
• Instruction Sheet (this manual)

Note: "Light" was listed in the original product data, but this is likely a generic placeholder. The actual product is a temperature control, not a light fixture. The above list is based on typical components for such a device.

Setup and Installation

The A19DAF-2C is designed for surface mounting, primarily on pipes. Follow these general steps for installation:

1. Power Disconnection: Ensure all power to the circuit where the control will be installed is disconnected at the main breaker or fuse box.
2. Mounting Location: Select a suitable location on the pipe or surface that is representative of the temperature to be controlled and allows for easy access for wiring and adjustment.
3. Mounting the Control: Use the provided adjustable mounting straps to securely fasten the control unit to the pipe. Ensure the sensing element is in good thermal contact with the pipe surface.
4. Wiring: Refer to the wiring diagram provided with the unit (not included in this general manual) and connect the line voltage wires to the color-coded electrical terminals. Ensure all connections are secure and comply with local electrical codes. The SPDT switch allows for various wiring configurations depending on whether you need to activate a device when the temperature rises or falls.
5. Insulation (Optional): If necessary, insulate the pipe and the sensing element to ensure accurate temperature sensing and minimize ambient temperature effects.
6. Power Restoration: Once installation and wiring are complete and verified, restore power to the circuit.

Operating Instructions

The A19DAF-2C temperature control operates by sensing the temperature of the surface it is mounted on and activating or deactivating a connected device based on the set point.

1. Setting the Temperature: The control features a concealed range scale. To adjust the set point, you may need to remove a cover or use a screwdriver, depending on the specific configuration of your unit's convertible range adjuster kit. Rotate the adjustment dial to the desired temperature within the 200 to 240°F range.
2. Understanding SPDT Action: The Single-Pole, Double-Throw (SPDT) switch has three terminals: Common (C), Normally Open (NO), and Normally Closed (NC).
   • When the sensed temperature is below the set point, the Common terminal is connected to the Normally Closed (NC) terminal.
   • When the sensed temperature rises above the set point (plus differential), the Common terminal switches connection to the Normally Open (NO) terminal.
   Wire your device to the appropriate terminals (NO or NC) based on whether you want it to turn ON when the temperature rises or falls.
3. Differential: The control has a fixed differential of 3-1/2°F (+/- 2.0°F). This means there is a temperature band around the set point within which the switch will not change state, preventing rapid cycling. For example, if the set point is 220°F and the differential is 3.5°F, the switch might turn on at 220°F and turn off at 216.5°F (or vice-versa, depending on wiring).

Maintenance

The Johnson Controls A19DAF-2C is designed for durability and requires minimal maintenance. However, periodic checks can ensure optimal performance and longevity.

• Cleaning: Keep the exterior of the control unit clean and free of dust and debris. Use a soft, dry cloth. Do not use abrasive cleaners or solvents.
• Connections: Periodically inspect electrical connections to ensure they remain tight and free from corrosion.
• Sensing Element: Ensure the sensing element remains securely attached and in good thermal contact with the surface being monitored.
• Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity limits for the device.

Warning: Always disconnect power before performing any maintenance or inspection.

Troubleshooting

If the A19DAF-2C temperature control is not functioning as expected, consider the following common issues and solutions:

If problems persist after attempting these solutions, contact a qualified technician or Johnson Controls customer support.

Specifications

Warranty and Support

Johnson Controls products are manufactured to high-quality standards. For specific warranty information regarding your A19DAF-2C temperature control, please refer to the warranty card included with your purchase or visit the official Johnson Controls website.

For technical support, troubleshooting assistance beyond what is provided in this manual, or to inquire about replacement parts, please contact Johnson Controls customer service. Contact information can typically be found on their official website or on the product packaging.

It is recommended to have the model number (A19DAF-2C) and serial number (if applicable) ready when contacting support.