Honeywell RTH6400 Series Quick Installation Manual page 13

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If your system type is...
If your system type is:
q Single Stage Heat and Cool
Congratulations, you're done!
If your system type is:
q Heat Pump* without Backup Heat
q Heat Only
q Cool Only
Continue with advanced installation
on page 13 to match your thermostat to your system
type.
*Heat Pump—an air conditioner that provides cooling
in the summer, and also runs in reverse in the winter to
provide heating.
If you are not sure of your system type or if you have
other questions, call us toll-free at 1-800-468-1502.
This thermostat works on 24 volt or 750 mV systems.
It will NOT work on multi-stage heat pump systems or
120/240 Volt systems.
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