L6006C Surface Mounted Aquastat Controller

Application

The L6006C is a nonimmersion Aquastat controller used for limiting or regulating temperature of liquids in boilers, storage tanks, and other applications where temperature control of liquids is required. The L6006C model features a dial stop factory-set at 200°F (93°C).

Installation

When Installing This Product...

• Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.
• Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.
• Installer must be a trained, experienced service technician.
• After installation is complete, check out product operation as provided in these instructions.

CAUTION

• Disconnect power supply before beginning installation to prevent electrical shock or equipment damage.
• Do not secure draw nut so tight that retainer clamp could collapse tubing.

Figure 1 shows the L6006C Surface-mounted Aquastat controller, a rectangular device with a dial and a viewing window, designed for surface mounting.

Mounting

The L6006C is designed for surface mounting on piping or tanks.

NOTE: When mounting the L6006C on piping, the pipe should be 1 in. (25.4 mm) diameter or larger for accurate temperature sensing. Remove any insulation from pipe. Thoroughly scrape off all scale, rust, or paint. Mount controller using adjustable bracket furnished.

Mount the L6006C directly on tank surface using the adjustable mounting bracket. The control can be mounted in any position. (If mounting L6006C on pipe, see NOTE above.)

Figure 2 illustrates the mounting of the L6006C controller on a pipe or tank. It depicts the controller attached to a pipe with an adjustable clamp, featuring an enclosed sensing bulb.

Wiring

Disconnect power supply before beginning installation to prevent electrical shock or equipment damage.

All wiring must comply with applicable codes and ordinances. The case has a knockout for 1/2 inch conduit. Figure 3 shows a typical hookup diagram.

Figure 3 is a wiring diagram for a typical oil-fired hydronic system with domestic hot water. It illustrates the connections for the L6006C controller, which can function as a high limit, low limit, or circulator controller. The diagram shows connections to a power supply (L1, L2), a thermostat (R, G), and various system components including a protector relay, high limit controller, burner motor, ignition relay, and circulator motor. Specific terminal connections on the L6006C are labeled R, B, and W, corresponding to its different control functions.

Controller Functions and Adjustment

High Limit Controller

R-B terminals provide high limit switching function (contacts open on temperature rise to set point). Shuts off burner if water temperature exceeds the high limit setting. Burner restarts when temperature drops to high limit setting less differential.

Low Limit Controller

R-B terminals provide low limit switching function (contacts open on temperature rise to set point). Maintains minimum boiler temperature for domestic hot water. Turns on boiler at temperature setting, minus differential.

Circulator Controller

R-W terminals provide circulation control function (contacts close on temperature rise to set point). Prevents circulation of water that is below the desired heating temperature. Breaks circulator circuit on temperature drop below setting minus differential, remakes on rise to setting.

Adjustment

Set the differential to correspond with the boiler manufacturer's recommendations. To adjust differential, rotate the wheel on the back of the snap switch until the desired reading is aligned with the "V" notch in the frame. The wheel provides an adjustment from 5°F to 30°F (2.8°C to 16.7°C). Replace the cover on the Aquastat controller.

Adjust the control point to correspond with the boiler manufacturer's recommendations. Insert a screwdriver in the slotted screw type head located beneath the window in the cover. Turn the scale to the desired temperature control point.

Figure 4 details the adjustment process for the L6006C. It highlights the set point indicating dial and the differential adjustment wheel located on the back of the unit.

Operation

For proper selection of settings, follow the boiler manufacturer's recommendations. The L6006C can be used as a high limit, low limit, or circulator controller.

Checkout

Check to make certain that the Aquastat controller has been installed and adjusted properly. Put the system into operation and observe through several cycles.