Honeywell installation instructions CT87A for a 2-wire heating only system

Models: CT87A

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CT87A,B,J ROUND® THERMOSTAT

Fig. 8. CT87A for a 2-wire heating only system.

CT87A WALLPLATE

 

 

POWER

R

 

 

 

Y

TO

W

SYSTEM

 

 

 

 

 

HEAT

 

 

M20183

Fig. 9. CT87A for a 3-wire hot water heating only system.

CT87A WALLPLATE

R

Y

W

R

W

WIRE LABELS (LETTERS ON ORIGINAL THERMOSTAT TERMINALS)

3-WIRE

HOT WATER ZONE VALVE

B

M20184

Fig. 10. CT87B for a 4-wire heating/cooling system.

 

 

 

 

 

T

 

 

 

 

 

A

 

 

 

 

 

E

 

 

 

 

 

H

 

 

 

 

F

 

 

O

F

 

 

 

 

L

 

 

 

 

 

 

 

 

 

 

 

 

O

 

 

 

 

 

O

 

 

 

 

 

C

 

 

 

 

 

RH G

RC

W

Y

FAN

O

N

A

U

T

O

CT87B SUBBASE

POWER

TO

FANSYSTEM

COOL

HEAT

JUMPER RH TO RC

M20185

7

69-0274-6

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Honeywell installation instructions CT87A for a 2-wire heating only system

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.