Honeywell International Inc. T8665E Manuel D’Utilisation

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USING THIS GUIDE
The T8665C,D,E Communicating Thermostat 
uses two-way radio frequency (RF) to send and 
receive information. This information can be 
used to make changes to your thermostat 
settings, or settings from your Energy Utility.
The following symbols will help you identify the 
features that apply to your system:
Tip symbol. Look for helpful 
tips throughout this guide 
when you see this symbol.
– Compressor with the word, 
Heat Pump, below.These 
features are availble when 
used with a heat pump.
Keyboard and Display Description
Keyboard
The keyboard is located behind the thermostat 
cover. Three frequently used keys: increase  , 
decrease  , and i key are located next to the 
display. See Fig. 1.
Display
The thermostat displays important information 
such as day, time, schedule period, 
temperature, filter information, system and fan 
operation. See Fig. 2.
WARNING: This product operates under 
provisions of Part 15 of the FCC Rules. 
Modifications to this product not specifically 
authorized by Honeywell may void the user’s 
authority to operate this device.
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HEAT PUMP