CT87A,B,J ROUND® THERMOSTAT

1.If using the cover ring: Position the cover ring against the wall so that the arrow in the middle of the cover ring is pointing up.

2.Position the wallplate or subbase.

If using cover ring: Place the wallplate/subbase over the cover ring. Rotate the wallplate/subbase until the wiring openings are aligned and the two screw holes on the left and right side of the wallplate/subbase align with the screw holes on the cover ring. You will be inserting screws through these holes into the wall.

If attaching wallplate directly to the wall: Position so that the UP indicator on the wallplate is on top.

If attaching subbase directly to the wall: Position so that the fan and heating/cooling switches are on the top.

3.Use a pencil to mark the center of the screw holes on the left and right sides of the wallplate or subbase.

4.Remove the wallplate/subbase and cover ring, and drill two 1/16-in. holes at the locations you marked.

5.Reposition the cover ring (if used) and wallplate/subbase over the holes, pull the wires through the wiring opening, and loosely insert the two 1-in. screws into the drilled holes.

If installing on an outlet box

Refer to Fig. 5 as you work.

Fig. 5. Installing wallplate/subbase on an outlet box (subbase shown).

1/2 IN. BINDING

OUTLET BOX

 

HEAD SCREW (2)

 

1

2 COVER RING SUBBASE

1/4 IN.

ROUND

HEAD SCREW (2)

A

THERMOSTAT

WIRING HOLE

1THE TWO INNER HOLES ARE USED WITH WALLPLATE.

2IF OUTLET BOX IS HORIZONTAL, MOUNT COVER RING IN POSITION SHOWN, BUT FASTEN WITH SCREWS THROUGH "A".

M20187

69-0274-6

4

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Honeywell CT87A If installing on an outlet box, Installing wallplate/subbase on an outlet box subbase shown

CT87A specifications

The Honeywell CT87A is a well-regarded thermostatic control unit designed for residential and light commercial HVAC applications. Specifically known for its reliable performance and user-friendly interface, the CT87A promotes energy efficiency while ensuring a comfortable indoor environment. This model is often referred to as the "Round" thermostat, with its distinctive circular design making it a recognizable fixture in homes.

One of the main features of the CT87A is its straightforward mechanical operation. Utilizing a bimetallic strip, it provides accurate temperature readings and control without the need for complex programming. This simplicity is a significant advantage for users who prefer a manual approach over digital displays and smart technologies. The CT87A comes with an easy-to-read temperature scale, allowing users to adjust the setting effortlessly to their desired comfort level.

In terms of technology, the CT87A functions purely on mechanical principles, making it highly durable over time. The thermostat operates on a 24-volt system, which is standard in many residential heating and cooling units. It is capable of controlling both heating and cooling systems, providing versatility for year-round use. Additionally, it allows for compatibility with a variety of HVAC equipment, making it an ideal choice for homeowners looking to upgrade their system without extensive modifications.

A notable characteristic of the Honeywell CT87A is its ability to deliver consistent performance with minimal power consumption. This contributes to energy savings, making it an environmentally-friendly choice for conscientious consumers. The conventional design does not rely on batteries or complicated electrical systems, reducing maintenance costs and the risk of failure.

Furthermore, the CT87A includes a built-in anticipator that helps to prevent temperature swings, enhancing user comfort. This feature enables the thermostat to adjust its operation slightly ahead of actual heating or cooling demands, ensuring that the desired room temperature is reached more efficiently.

In summary, the Honeywell CT87A thermostat combines reliable mechanical operation, energy efficiency, and ease of use, making it an excellent choice for those who appreciate simplicity and performance in temperature control. Its time-tested design, coupled with essential features, places it among the favorites for homeowners seeking a balance between functionality and comfort. Whether for a heating or cooling system, the CT87A consistently meets the demands of everyday use, ensuring a pleasant living environment.