STEP 2. REMOVE OLD THERMOSTAT

❑Test your heating and cooling systems to make sure they work properly. If either system does not work, contact your local heating/air-conditioning dealer. To avoid compressor damage, do not operate the cooling system when outdoor temperature is below 50°F (10°C).

❑Turn off power to the system at the furnace or the fuse/circuit breaker panel.

❑Carefully unpack your new thermostat and wallplate. Save package of screws, instructions, and receipt.

❑Remove the cover from the old thermostat. If the cover does not snap off when pulled firmly from the bottom, check for a screw or screws used to lock on the cover.

❑Loosen the screw or screws holding the thermostat to the wallplate and lift the thermostat away.

❑Disconnect the wires from the old thermostat. As you disconnect each wire, attach the enclosed labels with the old terminal designation. If there are only two wires, they do not need to be labeled. Wrap the wires around a pencil as shown to keep them from falling back into the wall.

Special Installations

Read this section if you are replacing:

•Clock thermostat with separate wires for the clock.

•Thermostat with six or more wires connected to it.

•Thermostat in a heating only system with three wires.

Replacing a Clock Thermostat that has C or C1 Clock Terminals

WIRES THROUGH WALL OPENING

M5136

If you are replacing a Honeywell Chronotherm® Thermostat, you may find one or two wires going to the C or C1 clock terminals on the Chronotherm wiring wallplate. Do not allow them to touch, or you can damage the transformer. Disconnect the wires and wrap them separately using electrical tape. Do not wrap them together. Place the wires where they will not interfere with the operation of the new thermostat. Record the colors and terminal designation labels of the remaining wires.

Replacing a Thermostat that has Six or More Wires

If there are six or more wires (excluding clock wires attached to terminals), you probably have a variation of a multistage heat pump or other multistage system. This thermostat is not compatible with multistage systems, so return the product to the place of purchase. For information about which programmable thermostats will work with your system, call Honeywell Customer Relations Center, at 1-800-468-1502.

Replacing a Thermostat that has Three Wires

If you have three wires for a heating only system and can operate the fan using the fan ON switch this thermostat works with your system. However, some hot water (zoned) heating systems also have three wires. Your thermostat will work only if you install an isolating relay on these systems. For details, call your local heating and/or cooling contractor.

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Honeywell CT3650 manual Remove OLD Thermostat, Special Installations
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CT3650 specifications

The Honeywell CT3650 is a state-of-the-art thermostat designed for optimum home climate control. This versatile device integrates advanced technology with user-friendly features, making it an ideal choice for homeowners seeking convenience and efficiency in temperature regulation.

One of the primary features of the CT3650 is its Wi-Fi connectivity. This allows users to control their home heating and cooling systems remotely via a smartphone app, providing flexibility and ease of use. Whether at work or on vacation, homeowners can adjust their thermostat settings from anywhere, ensuring comfort upon their return and promoting energy savings while away.

The CT3650 incorporates a color touchscreen display, offering an intuitive interface that makes navigation straightforward. Users can easily set schedules, view current conditions, and make adjustments with a simple tap. The vibrant display also allows for customizable color options, enhancing its aesthetic appeal to fit seamlessly into any home decor.

Another noteworthy characteristic of the Honeywell CT3650 is its Smart Response Technology. This feature learns the heating and cooling behaviors of the home and adjusts the temperature in advance to reach the desired setting by the programmed time. This not only enhances comfort but also increases energy efficiency, helping to reduce utility bills.

The CT3650 thermostat is compatible with various heating and cooling systems, including multi-stage systems, gas, electric, and heat pump configurations. This versatility ensures that homeowners can utilize the CT3650 with their existing systems without additional modifications.

Energy-saving capabilities are a highlight of the CT3650. It features an Adaptive Intelligent Recovery function, which calculates the optimal run time for the system to reach the target temperature at the scheduled time. This minimizes energy waste and maximizes efficiency, contributing to a more sustainable home environment.

Furthermore, the Honeywell CT3650 facilitates easy installation and setup. With straightforward wiring and setup instructions, users can quickly integrate the thermostat into their existing HVAC systems without requiring professional assistance.

In conclusion, the Honeywell CT3650 thermostat combines cutting-edge technology with user-centric design. With its Wi-Fi connectivity, intuitive touchscreen, smart response features, and compatibility with multiple systems, it stands out as an excellent choice for homeowners aiming to achieve a comfortable and energy-efficient living space.
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