1. Introduction
The Honeywell L6006A-1012 Aquastat Controller is an immersion-type device designed for precise temperature management of liquids in heating systems. It functions as a high or low limit control for boilers, storage tanks, and other applications requiring temperature regulation. This genuine Honeywell unit is engineered for reliable performance, featuring a maximum operating temperature of 150 degrees Fahrenheit and includes a 1/2-inch well for secure installation.

2. Safety Information
Prior to installation or operation, read all instructions carefully. Failure to follow these instructions may result in property damage, personal injury, or death.
- Electrical Hazard: Disconnect power supply before wiring to prevent electrical shock or equipment damage.
- Qualified Personnel: Installation and servicing must be performed by a qualified heating and air conditioning technician.
- Application: Use this product only as specified in this manual. Do not use for purposes other than those intended.
- Temperature Limits: Do not exceed the specified operating temperature limits of 150°F (66°C).
3. Package Contents
The Honeywell L6006A-1012 Aquastat Controller package typically includes:
- One (1) Honeywell L6006A-1012 Aquastat Controller unit
- One (1) 1/2-inch immersion well
4. Installation
The Honeywell L6006A-1012 Aquastat Controller is designed for straightforward installation in compatible systems. Always ensure power is disconnected before starting installation.
- Power Disconnection: Ensure the main power supply to the heating system is completely disconnected before beginning installation.
- Well Installation: Install the provided 1/2-inch immersion well into the boiler or storage tank at the desired temperature sensing location. Ensure a watertight seal.
- Controller Mounting: Mount the Aquastat Controller securely to a stable surface near the immersion well.
- Probe Insertion: Insert the temperature sensing probe from the Aquastat Controller into the immersion well.
- Wiring: Connect the electrical wiring according to the system's wiring diagram and local electrical codes. Refer to the internal wiring terminals visible when the cover is removed. This device operates on 120 Volts.
- Cover Replacement: Once wiring is complete and verified, replace the controller cover securely.
- Power Restoration: Restore power to the system and proceed to operation.

5. Operation
The L6006A-1012 Aquastat Controller regulates liquid temperature based on its setpoint.
- Temperature Setting: Adjust the temperature setpoint using the dial located on the front of the controller. The dial allows you to select the desired high or low limit temperature.
- Function: The controller will activate or deactivate the heating element or circulator pump to maintain the liquid temperature within the set parameters.
- Maximum Temperature: The device is designed to operate up to a maximum liquid temperature of 150 degrees Fahrenheit (66 degrees Celsius).
6. Maintenance
The Honeywell L6006A-1012 Aquastat Controller requires minimal maintenance.
- Periodic Inspection: Annually inspect the controller and its wiring for any signs of wear, corrosion, or damage.
- Cleaning: Keep the exterior of the controller clean and free of dust. Use a soft, dry cloth for cleaning. Do not use abrasive cleaners or solvents.
- Well Integrity: Periodically check the immersion well for leaks or sediment buildup. Ensure the probe is fully seated within the well.
7. Troubleshooting
If the Aquastat Controller is not functioning as expected, consider the following:
- No Power: Check the power supply to the heating system and the controller. Ensure all electrical connections are secure.
- Incorrect Temperature Reading/Control:
- Verify the temperature setpoint on the dial.
- Ensure the immersion probe is fully inserted into the well and making good thermal contact with the liquid.
- Check for sediment buildup in the well that might impede temperature sensing.
- System Not Heating/Overheating:
- Confirm the controller's setpoint is appropriate for the desired operation (high limit or low limit).
- Consult a qualified technician if the issue persists, as it may indicate a problem with the heating system itself or the controller's internal components.
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | L6006A-1012 |
| Brand | Honeywell |
| Operating Temperature (Max) | 150 Degrees Fahrenheit (66 Degrees Celsius) |
| Voltage | 120 Volts |
| Item Weight | 1.4 pounds (0.64 kg) |
| Product Dimensions | 5.6 x 2 x 2.2 inches (14.2 x 5.1 x 5.6 cm) |
| Material | Plastic, Stainless Steel |
| Special Features | Easy to Install |
| Batteries Required/Included | No |
| UPC | 085267053686 |

9. Warranty and Support
This Honeywell product is covered by the manufacturer's standard warranty. For specific warranty terms, technical assistance, or support, please refer to the official Honeywell website or contact Honeywell customer service directly. Keep your purchase receipt for warranty claims.