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USING THIS GUIDE
The T8635L is a multi-functional thermostat. This means it can be used in several different ways such as single
or multi-zone applications, conventional furnaces or heat pump equipment.
The following symbols will help you identify the features that apply to your system:
– Triple layer of thermostats with the word, zoning, below. These features are available when more
than one thermostat is connected and used with the optional W8703 Damper Interface Module.
– Compressor with the word, heat pump, below. These features are available when used with a heat
pump with auxiliary heat.
–Tip symbol. Look for helpful tips throughout the guide when you see this symbol.
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ZONING
HEAT PUMP