CT87A,B,J ROUND® THERMOSTAT

Check cooling

IMPORTANT: To avoid damaging the compressor in the air conditioner, do not operate the cooling system when the outdoor temperature is below 50°F (10°C).

1.If your CT87 has a subbase, set the System switch on the left to Cool.

IMPORTANT: After heating is tested, wait five minutes before switch- ing to Cool on the CT87J model.

2.Lower the temperature setting below room temperature. The cooling system should start.

3.Raise the temperature setting above room temperature. The cooling system should stop.

Operation

To set the temperature, turn the dial until the pointer on the top setting scale aligns with the desired temperature.

CT87B, J switches

Switch

Setting

Result

 

 

 

System

Cool

The thermostat controls your cooling system.

 

 

 

 

Off

Both the heating and cooling systems are off.

 

 

 

 

Heat

The thermostat controls your heating system.

 

 

 

Fan

On

The fan runs continuously.

 

 

 

 

Auto

The fan runs only with the heating or cooling

 

 

system.

 

 

 

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Honeywell CT87A installation instructions Check cooling, Operation, CT87B, J switches, Switch Setting Result

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.