When the batteries are running low, a REPL BAT message flashes for one to two months before the batteries run out completely. Replace the batteries as soon as possible once the message flashes.

IMPORTANT

Although the thermostat has a low battery indicator, replace the batteries once per year to prevent leakage and to prevent the ther- mostat and heating/cooling system from shutting down due to lack of battery power in the thermostat.

If you insert new batteries within 20 to 30 seconds of removing the old batteries, the system retains the current time and day. If the display is blank, the batteries are dead or installed incorrectly. You must reset the time and day. Refer to Set the Clock for instructions.

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As a precaution when leaving home for longer than a month, change batteries before leaving to prevent the system from shutting down due to lack of power. Always use fresh alkaline batteries. Nonalkaline batteries do not last as long. They also can leak, causing damage to the thermostat and the wall surface.

STEP 6. SET FAN OPERATION SWITCH

The thermostat fan operation switch, labeled FUEL SWITCH is factory set in the F position. This is the correct setting for most systems. If your system is an electric heat system, set the switch to E. The E setting allows the fan to turn on immediately with the heating and cooling in a system where the G terminal is connected.

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Honeywell CT3600, CT3697 manual SET FAN Operation Switch
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CT3697, CT3600 specifications

The Honeywell CT3600 and CT3697 are advanced digital thermostats designed to enhance comfort and energy efficiency in residential and light commercial applications. These devices incorporate cutting-edge technologies and feature rich capabilities to ensure precision temperature control, energy savings, and easy operation.

One of the standout features of both models is their user-friendly interface, which includes a large, easy-to-read LCD display. This display allows users to quickly access settings and monitor indoor temperature and humidity levels. The backlighting ensures readability in low-light conditions, making it convenient to use at any time of the day or night.

The Honeywell CT3600 and CT3697 are equipped with smart programming capabilities. Homeowners can easily set schedules for heating and cooling based on their daily routines, which optimizes energy use while maintaining comfort. The 7-day programmable feature offers the ability to set different schedules for each day of the week, allowing for tailored comfort on both weekdays and weekends.

Additionally, these models include adaptive intelligence technology. This feature learns the homeowner's habits over time and adjusts the temperature settings accordingly, ensuring that the home reaches the desired comfort level at the right time without unnecessary energy consumption. This intelligence not only enhances comfort but can contribute to lower energy bills.

Both models support multi-stage heating and cooling systems, accommodating various HVAC configurations with ease. They offer compatibility with conventional, heat pump, and auxiliary heating systems, providing versatility for different home setups.

Another important characteristic is the decision to use environmentally friendly materials in the construction of the CT3600 and CT3697. This commitment to sustainability aligns with Honeywell's initiatives toward energy efficiency and ecological responsibility.

Furthermore, installation is simple thanks to the integrated step-by-step guide within the thermostat, allowing users to set up the device without needing professional help. The ability to connect to Wi-Fi for remote access and control further enhances the user experience, as homeowners can adjust settings from their smartphones or computer.

In conclusion, the Honeywell CT3600 and CT3697 are sophisticated yet user-friendly thermostats that combine advanced technology with practical features, offering significant benefits in comfort, convenience, and energy savings for homeowners.
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